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Oils as Antiviral Agents, Potential of Essential Oils to Treat SARS-CoV-2 Infection: An In-Silico Investigation\n\nAbstract\nEssential oils have shown promise as antiviral agents against several pathogenic viruses. In this work we hypothesized that essential oil components may interact with key protein targets of the 2019 severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2). A molecular docking analysis was carried out using 171 essential oil components with SARS-CoV-2 main protease (SARS-CoV-2 Mpro), SARS-CoV-2 endoribonucleoase (SARS-CoV-2 Nsp15/NendoU), SARS-CoV-2 ADP-ribose-1″-phosphatase (SARS-CoV-2 ADRP), SARS-CoV-2 RNA-dependent RNA polymerase (SARS-CoV-2 RdRp), the binding domain of the SARS-CoV-2 spike protein (SARS-CoV-2 rS), and human angiotensin−converting enzyme (hACE2). The compound with the best normalized docking score to SARS-CoV-2 Mpro was the sesquiterpene hydrocarbon (E)-β-farnesene. The best docking ligands for SARS−CoV Nsp15/NendoU were (E,E)-α-farnesene, (E)-β-farnesene, and (E,E)−farnesol. (E,E)−Farnesol showed the most exothermic docking to SARS-CoV-2 ADRP. Unfortunately, the docking energies of (E,E)−α-farnesene, (E)-β-farnesene, and (E,E)−farnesol with SARS-CoV-2 targets were relatively weak compared to docking energies with other proteins and are, therefore, unlikely to interact with the virus targets. However, essential oil components may act synergistically, essential oils may potentiate other antiviral agents, or they may provide some relief of COVID-19 symptoms.\n\n1. Introduction\nThe 2019 severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) is a newly emerging respiratory illness. The epidemic started in December 2019 in Wuhan, China, and has rapidly spread throughout China and the world and is now a global pandemic. SARS-CoV-2 can be efficiently transmitted among humans and has shown a high degree of morbidity and mortality [1,2]. As of April 20, 2020, the worldwide number of infected individuals was 2,544,792, with as many as 175,694 deaths [3]. There are currently no approved vaccines available for the prevention of SARS-CoV-2 infection and only just recently, remdesivir has received “emergency use authorization” for treatment of COVID-19 in the United States; therefore, there is an urgent demand for potential chemotherapeutic agents to treat this disease.\nEssential oils have been screened against several pathogenic viruses (Table 1), including influenza and other respiratory viral infections. Influenza is an infectious respiratory disease caused by one of three types of influenza viruses, type A, type B, or type C [4]. The most significant in terms of human morbidity and mortality is influenza virus type A, which is found in several bird and mammal species [5]. Several different serotypes of influenza type A have caused global flu pandemics [6]: H1N1, which caused the Spanish flu in 1918 (40–50 million deaths worldwide) [7] and the swine flu in 2009 [8]; the Asian flu of 1957–1958 (ca. 1.5 million deaths worldwide) was caused by influenza A H2N2 [8]; serotype H3N2 caused the Hong Kong flu in 1968 [9]; and H5N1, which caused the bird flu in 2004 [10]. Influenza virus type B, however, is largely confined to human hosts [11].\nOne study evaluated the in vitro antiviral effect against influenza type A (H1N1) of commercial essential oils that included cinnamon (Cinnamomum zeylanicum), bergamot (Citrus bergamia), lemongrass (Cymbopogon flexuosus), thyme (Thymus vulgaris), and lavender (Lavandula angustifolia). The oils were tested in the liquid phase at a concentration of 0.3% and in the vapor phase. The oils of cinnamon, bergamot, thyme, and lemongrass displayed 100% inhibition of H1N1 in the liquid phase, while the inhibition for lavender essential oil was 85%. However, in the vapor phase, 100% inhibition was observed only for cinnamon leaf essential oil after 30 min of exposure. The bergamot, lemongrass, thyme, and lavender essential oils displayed inhibition rates of 95%, 90%, 70%, and 80%, respectively [12].\nCinnamomum zeylanicum leaf oil is characterized by eugenol (75–85%), followed by smaller amounts of linalool (1.6–8.5%), and benzyl benzoate (0.1–8.3%) [13,14,15]. Bergamot oil is rich in limonene (23–55%), linalool (2–37%), and linalyl acetate (12–41%), with lesser quantities of β-pinene (up to 10%) and γ-terpinene (up to 10%) [16,17,18,19,20]. Geranial (48–54%) and neral (29–33%) have been reported as the major components of C. flexuosus, but many chemotypes, cultivars, and variants have been reported for C. flexuosus [21,22].\nIn the literature, there have been at least 20 different chemotypes identified for thyme essential oil. The “typical” thyme essential oil presents a thymol content of 45% (range 31–50%), with significant concentrations of p-cymene (0.1–26.6%, average = 15.6%) and γ-terpinene (up to 22.8%, average = 9.3%). In addition, there are several other chemotypes of T. vulgaris rich in thymol and/or carvacrol [23]. Thymol has been identified as an anti-influenza agent against influenza type A and parainfluenza type 3 virus [24,25]. Lavandula angustifolia essential oil is rich in linalyl acetate (37.0–43.6%), linalool (19.7–39.1%), geraniol (up to 9.3%), β-caryophyllene (up to 5.1%), terpinen-4-ol (up to 14.9%), lavandulyl acetate (up to 5.5%), and borneol (up to 6.4%) [26,27,28,29].\nAnother essential oil with notable anti-influenza effects is tea tree, which is extracted from the leaves of Melaleuca alternifolia (Myrtaceae). Commercial tea tree oil is composed of terpinen-4-ol (30–48%), γ-terpinene (10–28%), α-terpinene (5–13%), 1,8-cineole (up to 15%), terpinolene (1.5–5%), p-cymene (0.5–12%), α-pinene (1–6%), and α-terpineol (1.5–8%) [30]. Tea tree oil showed 100% inhibition of influenza type A (H1N1) virus at 0.01% concentration and a median inhibitory concentration (IC50) of 6 μg/mL [31,32]. In addition, 30 min exposure of type A (H11N9) virus to tea tree oil vapor caused 100% inhibition [33]. The tea tree oil components, terpinen-4-ol, terpinolene, and α-terpineol, have shown anti-influenza virus activity against type A (H1N1), with IC50 values of 25, 12, and 250 μg/mL, respectively. α-Terpinene, γ-terpinene, and p-cymene were inactive, however [31].\nAvian influenza viruses (H5N1) exhibit both high and low virulence in numerous mammalian species, highlighting the connection between the route of inoculation and virus pathogenicity [34]. Since 2003, there have been over 600 documented cases of human infection with H5N1 viruses, with most cases among young, previously healthy individuals [35]. The essential oils extracted from Citrus reshni leaves and peel (unripe and ripe fruits) were tested against H5N1 virus by plaque reduction assay. The oils showed moderate inhibition of the H5N1 virus at a concentration of 2.5 μL/mL. Sabinene (40.5%), linalool (23.3%), and terpinen-4-ol (8.3%) were the main constituents in the leaf oil while limonene (82.4%, 91.6%) was the main compound in the fruit peel essential oils (unripe and ripe, respectively) [36].\nThe essential oil of leaves of Fortunella margarita is rich in the sesquiterpenoids β-eudesmol (28.3%), α-muurolene (10.3%), β-gurjunene (10.0%), γ-eudesmol (8.4%), and γ-muurolene (6.6%) while the essential oil extracted from the fruits showed monterpenoids as the main components, α-terpineol (55.5%), carvone (5.7%), and carveol (5.5%). Both samples were tested for antiviral activity against avian influenza (H5N1) virus, and the obtained results revealed that the fruit essential oil was more effective (80% virus inhibition by the MTT (3-(4,5-dimethylthiazol-2-yl)-2,5-diphenyltetrazolium bromide) assay using Madin−Darby canine kidney (MDCK) cells for virus propagation). The IC50 values obtained for the leaf and fruit essential oils were 38.89 and 6.77 μg/mL, respectively [53].\nDengue fever, a mosquito−borne disease, is caused by dengue virus (DENV) which includes four major serotypes (DENV-1, -2, -3, and -4). Some serotypes cause more severe diseases than others; severe dengue is associated with secondary infections by a different serotype. Dengue disease is a major public health problem in developing tropical countries and has being continuously spreading to new geographical areas [92]. The essential oils of two species of Lippia were assayed against four dengue serotypes (DENV-1, DENV-2, DENV-3, DENV-4) [61]. The IC50 values for Lippia alba oil, rich in carvone (39.7%), limonene (30.6%), and bicyclosesquiphellandrene (8.9%), were between 0.4 and 32.6 μg/mL. However, the Lippia citrodora essential oil, composed of geranial (18.9%), neral (15.6%), limonene (10.7%), and 1,8-cineole (5.0%), showed the best activity, with IC50 values varying from 1.9 to 33.7 μg/mL. No viral inhibitory effect was observed by addition of the essential oil after virus adsorption; the inhibitory effect of the essential oil seemed to cause direct virus inactivation before adsorption on the host cell.\nThe essential oils of seven aromatic plants from Córdoba, San Luis, and San Juan provinces (Argentina) were screened for cytotoxicity and in vitro inhibitory activity against dengue virus type 2 (DENV−2) [38]. The oils of Jungia polita and Buddleja cordobensis were composed of caryophyllene oxide (9.18%, 32.1%) and β-caryophyllene (8.13%, 16.5%) as the major compounds. However, these oils displayed different IC50 values (86.4 and 39.8 μg/mL, respectively). The other samples were composed mostly of monoterpenes and displayed lower activity, except Pectis odorata oil, which presented limonene (50.2%), neral (27.2%), and geranial (23.6%) as the major compounds and an IC50 value of 39.6 μg/mL. In addition, the essential oils of Artemisia mendozana, rich in camphor (22.4%), artemisole (11.7%), and artemisia alcohol (10.8%); Gailardia megapotamica composed of β-pinene (35.5%), spathulenol (10.7%), and germacrene D (6.8%); and Heterothalamus alienus characterized by β-pinene (35.5%), spathulenol (10.7%), and germacrene D (6.8%), showed an average IC50 value of 130.63 μg/mL.\nYellow fever (YF), caused by yellow fever virus (YFV), has historically been considered one of the most dangerous infectious diseases. YFV is transmitted to humans via mosquitoes of the Haemogogus, Sabethes, and Aedes genera. Annually, there are approximately 80,000–200,000 YFV cases worldwide, with a case fatality rate (CFR) ranging from 20–60% [93,94]. Essential oils of Lippia species and their main compounds have been tested against yellow fever virus (YFV) in Vero cells. The oil of Lippia origanoides showed carvacrol (44.0%), thymol (15.0%), and γ-terpinene (10.0%) as the main compounds and displayed 100% inhibition at a concentration of 11.1 μg/mL [43]. However, in the same study, the oil of L. alba displayed 100% inhibition at a concentration of 100.0 μg/mL. The major compounds were carvone (51.0%), limonene (33.0%), and bicyclosesquiphellandrene (7.0%). The essential oil of L. alba with a similar chemical composition, carvone (39.7%), limonene (30.6%), and bicyclosesquiphellandrene (8.9%), displayed an IC50 value of 4.3 μg/mL against YFV when tested in Vero cells using the MTT assay [62]. The essential oil of L. citriodora, dominated by geranial (18.9%), neral (15.6%), and limonene (10.7%), did not display a statistical difference in comparison to citral, with IC50 values of 19.4 and 17.6 μg/mL, respectively [62].\nIn addition to essential oils, several individual essential oil components have been screened for antiviral activity (Table 2).\nBecause of the activities of several essential oils and essential oil components against human pathogenic viruses, we hypothesized that essential oil components may be potentially useful as antiviral agents against SARS-CoV-2. In this work, we carried out a molecular docking analysis of the major components of essential oils that exhibit antiviral activity (Table 1 and Table 2) with known SARS-CoV-2 protein targets.\n\n2. Results and Discussion\nSeveral proteins have been identified for severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2), which may serve as potential targets for chemotherapeutic intervention in coronavirus disease 2019 (COVID-19). These protein targets include SARS-CoV-2 main protease (SARS-CoV-2 Mpro), SARS-CoV-2 endoribonucleoase (SARS-CoV-2 Nsp15/NendoU), SARS-CoV-2 ADP−ribose−1″−phosphatase (SARS-CoV-2 ADRP), SARS-CoV-2 RNA-dependent RNA polymerase (SARS-CoV-2 RdRp), the binding domain of the SARS-CoV-2 spike protein (SARS-CoV-2 rS), and human angiotensin−converting enzyme (hACE2). There have already been several molecular docking studies on these macromolecular targets. Several groups have carried out molecular docking of natural product libraries with SARS-CoV-2 Mpro [102,103,104,105]. Additionally, commercially available drugs have also been examined using in silico methods [106,107].\nA molecular docking study was carried out with 171 essential oil components with SARS-CoV-2 Mpro (PDB: 5R7Z, 5R80, 5R81, 5R82, 5R83, 5R84, 6LU7, 6M03, and 6Y84), SARS-CoV-2 Nsp15/NendoU (PDB: 6VWW, 6W01, and 6W02), SARS-CoV-2 rS (PDB: 6M0J, 6M17, 6VX1, and 6VW1), and SARS-CoV-2 RdRp (PDB: 6M71). The best docking scores are summarized in Table 3.\nThe main protease, SARS-CoV-2 Mpro, is a cysteine protease that is essential for processing the polyproteins that are translated from the coronavirus RNA [108]. The substrate binding site of the enzyme is a cleft flanked by Gln189, Met49, Pro168, Glu166 and His41; the active site is Cys145 and His41. The compound with the best normalized docking score to SARS-CoV-2 Mpro was the sesquiterpene hydrocarbon (E)-β-farnesene (DSnorm = −115.4 kJ/mol). Other essential oil components showing good docking scores with SARS-CoV-2 Mpro were (E,E)-α-farnesene (DSnorm = −115.0 kJ/mol), (E,E)-farnesol (DSnorm = −112.4 kJ/mol), and (E)-nerolidol (DSnorm = −110.7 kJ/mol). The sesquiterpene hydrocarbons (E,E)-α-farnesene and (E)-β-farnesene occupy the substrate binding site, flanked by Gln189, Arg188, Met165, His41, and Asp 187 (Figure 1). The lowest-energy docked poses of both (E,E)-farnesol and (E)-nerolidol showed hydrogen bonding of the alcohol moiety to Gln192 and Thr190 and, in the case of (E)-nerolidol, also with GLN189 and ARG188 (Figure 2).\nNon-structural protein 15 (Nsp15) of SARS-CoV-2 is an endoribonuclease that preferentially cleaves RNA at uridylate. Furthermore, it has been shown that SARS-CoV Nsp15/NendoU is required for successful viral infection [109]. The best docking ligands for SARS-CoV Nsp15/NendoU are (E,E)-α-farnesene (DSnorm = −107.5 kJ/mol), (E)-β-farnesene (DSnorm = −105.0 kJ/mol), (E,E)-farnesol (DSnorm = −104.6 kJ/mol), and (E)-nerolidol (DSnorm = −101.6 kJ/mol). All of these sesquiterpenoids preferentially docked into a binding site formed by amino acid residues Gln347, Ile328, Val276, Ser274, Thr275, Ser329, Asn74, Asn75, Glu327, and Lys71 (Figure 3). In addition to van der Waals interactions, (E,E)-farnesol showed hydrogen-bonding interactions with Ser329 and Glu327, while (E)-nerolidol hydrogen bonded with Asn75 and Lys71 (Figure 3). Unfortunately, the docking scores for these ligands as well as the scores of the other essential oil components with this protein are too low for it to be considered a viable target (see Table 3).\nADP ribose phosphatase (ADRP) serves to convert ADP-ribose 1″-monophosphate (Appr-1″-p) to ADP-ribose (Appr), which serves to regulate virus replication [110]. This enzyme may be dispensable in SARS-CoV-2, however [111]. Nevertheless, (E,E)-farnesol showed the most exothermic docking to SARS-CoV-2 ADRP with DSnorm = −121.4 kJ/mol. The binding site in SARS-CoV-2 ADRP is surrounded by Phe132, Asn40, Ile131, Ala38, and Ala39, with hydrogen-bonded interactions between the ligand alcohol and Asn40 (Figure 4). Additional essential oil components with good docking scores with SARS-CoV-2 ADRP include the sesquiterpene hydrocarbons (E)-β-farnesene (DSnorm = −116.3 kJ/mol), (E,E)-α-farnesene (DSnorm = −114.2 kJ/mol), β-sesquiphellandrene (DSnorm = −115.7 kJ/mol), and α-zingiberene (DSnorm = −115.4 kJ/mol); the diterpenoids phytol (DSnorm = −118.9 kJ/mol) and phytone (DSnorm = −116.9 kJ/mol); and the phenylpropanoid eugenyl acetate (DSnorm = −115.4 kJ/mol). Not surprisingly, β-sesquiphellandrene and α-zingiberene adopted the same docking orientation in the binding site of the enzyme (Figure 5A). Similarly, phytol and phytone occupy the same location in the binding site (Figure 5B).\nRNA-dependent RNA polymerase catalyzes RNA replication from an RNA template and is an essential enzyme in RNA viruses. Because these enzymes are crucial in viral replication, they are viable targets in antiviral chemotherapy [112]. Molecular docking of essential oil components with SARS-CoV-2 RdRp showed only weak docking with this enzyme target (Table 3). The ligand with the best docking score was (E,E)-farnesol, with DSnorm = −89.6 kJ/mol.\nThe SARS-CoV-2 spike protein serves to attach to angiotensin-converting enzyme 2 (ACE2) of the human cell to be invaded. The interface between SARS-CoV-2 rS and human ACE2 would be a promising target to prevent binding of SARS-CoV-2 rS to human ACE2 [113,114]. The best docking ligands with human ACE2, i.e., normalized docking scores \u003c -100 kJ/mol (α-bulnesene, eremanthin, (E,E)-α-farnesene, (E)-β-farnesene, (E,E)-farnesol, (E)-nerolidol, β-sesquiphellandrene, and (Z)-spiroether), all show docking preference to a cavity removed from the interaction interface between the SARS-CoV-2 spike protein and ACE2 (Figure 6). This cavity is a pocket surrounded by residues Pro565, Leu95, Val209, Asn210, Leu91, Lys94, Glu208, and Glu564. Because of the remote location of docking with ACE2, it is predicted that interaction of essential oil components with ACE2 will not prevent protein–protein interaction between the SARS-CoV-2 spike protein and human ACE2.\nOn the other hand, the lowest energy poses of essential oil components showing the strongest docking (\u003c−80 kJ/mol; (E)-cinnamyl acetate, eremanthin, (E,E)-α-farnesene, (E)-β-farnesene, (E,E)-farnesol, and geranyl formate) with the binding domain of the SARS-CoV-2 spike protein do lie at the interface between the SARS-CoV-2 spike protein and human ACE2 (Figure 6). This docking site is a hydrophobic pocket formed by Tyr505, Tyr495, Asn501, Arg403, Tyr453, and Gly502. Unfortunately, the docking energies at this site are too weak and are unlikely, therefore, to disrupt binding between SARS-CoV-2 rS and human ACE2.\nIn order to compare docking scores of the essential oil components with other proteins, docking was also carried out with six randomly selected non-virus proteins: Bovine odorant binding protein (BtOBP, PDB: 1GT3), cruzain (PDB: 1ME3), torpedo acetylcholinesterase (TcAChE, PDB: 6G1U), Bacillus anthracis nicotinate mononucleotide adenylytransferase (BaNadD, PDB: 3HFJ), Russell’s viper phospholipase A2 (DrPLA2, PDB: 1FV0), and Escherichia coli l-aspartate aminotransferase (EcAspTA, PDB: 2Q7W). Docking scores for these proteins are summarized in Table 4.\nThe docking results of the essential oil components with the six randomly selected proteins indicate the best docking ligands to SARS-CoV-2 targets (i.e., (E,E)-α-farnesene, (E)-β-farnesene, and (E,E)-farnesol) have better docking energies with other proteins. These three sesquiterpenes have docking energies of −129.8, −122.7, and −133.0 kJ/mol with TcAChE, respectively, and −131.8, −131.8, and −135.6 kJ/mol, respectively, with BaNadD. Indeed, most of the essential oil ligands have better docking properties with one or more of the random proteins compared to the SARS-CoV-2 proteins.\nBased on the docking energies of essential oil components with key protein targets of SARS-CoV-2, the individual essential oil components cannot be considered viable chemotherapeutic agents for interaction with the SARS-CoV-2 target proteins. However, essential oils are complex mixtures of compounds and several essential oil components may act synergistically to inhibit the virus. Astani and co-workers have shown, for example, that the antiviral activity (HSV-1) of Eucalyptus oil is much greater than the major component 1,8-cineole, and that tea tree oil has a greater antiviral activity than its components terpinen-4-ol, γ-terpinene, and α-terpinene [52].\nSynergistic effects have also been observed between essential oils and synthetic antiviral agents. Civitelli and co-workers observed an antiviral synergism between Mentha suaveolens essential oil and acyclovir on HSV-1 [64]. Likewise, Melissa officinalis essential oil potentiated the activity of oseltamivir against avian influenza virus H9N2 [115]. Furthermore, essential oils are lipophilic and therefore may also serve to disintegrate viral membranes [116].\nOutside of antiviral activity, there may be some relief of symptoms of COVID-19 provided by essential oils. For example, linalool [117,118], β-caryophyllene [119,120], and 1,8-cineole [121,122] have both anti-inflammatory and antinociceptive activity; menthol [123,124], camphor [125,126], and thymol [127] have antitussive activities.\n\n3. Materials and Methods\n\n3.1. Bibliographic Search Criteria\nThe bibliographic research was performed using the databases Google Scholar, Pubmed, Science Direct, Medline, and Scopus. The keywords applied were “antiviral activity” and “essential oils”, “antiviral activity” and “volatile compounds”, and “essential oils” and “respiratory diseases”.\n\n3.2. Ligand Selection\nThe major components (\u003e5%) of essential oils and pure essential oil components that have been screened against human pathogenic viruses were selected. In the case where enantiomers are known to be natural products, both structures were selected. A total of 171 essential oil components were used in the virtual screening.\n\n3.3. Molecular Docking\nEach ligand structure was prepared using Spartan ’18 v. 1.4.4 (Wavefunction, Inc., Irvine, CA, USA). The lowest-energy conformations of the ligands were determined and used as starting structures in the molecular docking. This is particularly important to include all potential conformations in medium-sized rings where interconversion between conformations may be hindered (e.g., bicyclogermacrene, costunolide, curdione, germacrene D, germacrone, and α-humulene). A total of six protein targets of SARS-CoV-2 from the Protein Data Bank (PDB), represented by a total of 17 structures, were used in the molecular docking, including SARS-CoV-2 main protease (PDB: 5R7Z, 5R80, 5R81, 5R82, 5R83, 5R84, 6LU7, 6M03, and 6Y84), SARS-CoV-2 endoribonuclease (PDB: 6VWW), SARS-CoV-2 ADP ribose phosphatase (PDB: 6W01 and 6W02), SARS-CoV-2 RNA-dependent RNA polymerase (PDB: 6M71), SARS-CoV-2 spike protein binding domain (PDB: 6M0J, 6VX1, 6VW1, and 6M17), and the human angiotensin-converting enzyme (PDB: 6M0J, 6VX1, 6VW1, and 6M17). Molecular docking was carried out using Molegro Virtual Docker v. 6.0.1 (Aarhus, Denmark) as previously reported [128,129]. Briefly, a 15-Å radius sphere centered on the binding sites of each protein structure in order to permit each ligand to search. In the case of the spike protein and human ACE2, the docking sphere was located at the interface between the spike protein and ACE2. In one case, ACE2 was removed and docking was carried out with the spike protein, and in the other case, the spike protein was removed and docking was carried out with ACE2. Standard protonation states of each protein, based on neutral pH, were used, and charges were assigned based on standard templates as part of the Molegro Virtual Docker program. Each protein was used as a rigid model without protein relaxation. Flexible-ligand models were used in the docking optimizations. Different orientations of the ligands were searched and ranked based on their “rerank” energy scores. A minimum of 100 runs for each ligand was carried out. In analyzing the docking scores, we accounted for the recognized bias due to molecular weight [130,131,132] using the scheme: DSnorm = 7.2 × Edock/MW⅓, where DSnorm is the normalized docking score, Edock is the MolDock re-rank score, MW is the molecular weight, and 7.2 is a scaling constant to ensure the average DSnorm values are comparable to those of Edock [128]. The best docking results are summarized in Table 1.\n\n4. Conclusions\nA molecular docking analysis was carried out using 171 essential oil components with the SARS-CoV-2 main protease (SARS-CoV-2 Mpro), SARS-CoV-2 endoribonucleoase (SARS-CoV-2 Nsp15/NendoU), SARS-CoV-2 ADP-ribose-1″-phosphatase (SARS-CoV-2 ADRP), SARS-CoV-2 RNA-dependent RNA polymerase (SARS-CoV-2 RdRp), the binding domain of the SARS-CoV-2 spike protein (SARS-CoV-2 rS), and human angiotensin-converting enzyme (hACE2). The best docking ligands for the SARS-CoV target proteins were (E,E)-α-farnesene, (E)-β-farnesene, and (E,E)-farnesol. The docking energies were relatively weak, however, and are unlikely to interact with the virus targets. However, essential oil components may act synergistically, essential oils may potentiate other antiviral agents, or they may provide some relief of COVID-19 symptoms.\n\nAcknowledgments\nW.N.S. participated in this work as part of the activities of the Aromatic Plant Research Center 237 (APRC, https://aromaticplant.org/).\n\nAuthor Contributions\nConceptualization, J.K.R.d.S., K.G.B., and W.N.S.; methodology, J.K.R.d.S., K.G.B., and W.N.S.; formal analysis, W.N.S.; investigation, J.K.R.d.S., P.L.B.F., K.G.B., and W.N.S.; data curation, W.N.S.; writing—original draft preparation, J.K.R.d.S. and W.N.S.; writing—review and editing, J.K.R.d.S., P.L.B.F., K.G.B., and W.N.S.; project administration, W.N.S.; All authors have read and agreed to the published version of the manuscript.\n\nFunding\nThis research received no external funding.\n\nConflicts of Interest\nThe authors declare no conflict of interest. Abbreviations\nAdeno Adenovirus\nAIV Avian influenza virus\nBaNadD Bacillus anthracis nicotinate mononucleotide adenylytransferase\nBtOBP Bovine odorant binding protein\nCOVID-19 Coronavirus disease 2019\nCox B1 Coxsackie B1 virus\nDENV-1 Dengue virus serotype 1\nDENV-2 Dengue virus serotype 2\nDENV-3 Dengue virus serotype 3\nDENV-4 Dengue virus serotype 4\nDrPLA2 Russell’s viper phospholipase A2\nDSnorm Normalized docking score\nEcAspTA Esherichia coli L-aspartate aminotransferase\nECHO 9 Echovirus 9\nhACE2 Human angiotensin-converting enzyme\nHeLa Human cervical tumor cells\nHEp-2 Human epithelial type 2 cells\nHRSV Human respiratory syncytial virus\nHSV-1 Herpes simplex virus 1\nHSV-2 Herpes simplex virus 2\nIC50 Median inhibitory concentration\nJUNV Junin virus\nMDCK Madin-Darby canine kidney cells\nMTT 3-(4,5-dimethylthiazol-2-yl)-2,5-diphenyltetrazolium bromide\nPCR Polymerase chain reaction\nPDB Protein data bank\nPolio 1 Poliomyelitis virus 1\nRC-37 African green monkey kidney cells\nSARS-CoV-2 2019 severe acute respiratory syndrome coronavirus 2\nTcAChE Torpedo acetylcholinesterase\nVero African green monkey kidney cells\nYFV Yellow fever virus\n\nFigure 1 Lowest-energy docked poses of (E)-β-farnesene and (E,E)-α-farnesene with the SARS-CoV-2 main protease (PDB: 6LU7). (A) Ribbon structure of the enzyme and (E)-β-farnesene. (B) Solid structure of the enzyme showing (E)-β-farnesene in the binding cleft. (C) Amino acid residues in proximity to the docked (E)-β-farnesene. (D) Lowest-energy docked pose of (E,E)-α-farnesene in the enzyme binding site.\nFigure 2 Lowest-energy docked poses of (E,E)-farnesol and (E)-nerolidol with the SARS-CoV-2 main protease (PDB: 6Y84). (A) Ribbon structure of the enzyme and (E,E)-farnesol (magenta) and (E)-nerolidol (orange). (B) Solid structure of the enzyme showing (E,E)-farnesol (magenta) and (E)-nerolidol (orange) in the binding cleft. (C) Important interactions of amino acid residues with (E,E)-farnesol. (D) Important interactions of amino acid residues with (E)-nerolidol. Hydrogen bonds are indicated with blue dashed lines.\nFigure 3 Lowest-energy docked poses of (E,E)-α-farnesene, (E)-β-farnesene, (E,E)-farnesol, and (E)-nerolidol with SARS-CoV-2 endoribonuclease (PDB: 6VWW). (A) Ribbon structure of the enzyme and (E,E)-α-farnesene (green), (E)-β-farnesene (aqua), (E,E)-farnesol (magenta), and (E)-nerolidol (orange). (B) Solid structure of the enzyme showing (E,E)-α-farnesene (green), (E)-β-farnesene (aqua), (E,E)-farnesol (magenta), and (E)-nerolidol (orange) in the binding cleft. (C) Lowest-energy docked pose of (E,E)-α-farnesene in the binding site. (D) Lowest-energy docked pose of (E)-β-farnesene in the binding site. (E) Lowest-energy docked pose of (E,E)-farnesol in the binding site. (F) Lowest-energy docked pose of (E)-nerolidol in the binding site. Hydrogen bonds are indicated with blue dashed lines.\nFigure 4 Lowest-energy docked pose of (E,E)-farnesol with SARS-CoV-2 ADP ribose phosphatase (PDB: 6W02). (A) Ribbon structure of the enzyme and the docked ligand. (B) Solid structure of the enzyme showing (E,E)-farnesol in the binding cleft. (C) Amino acid residues in proximity to the docked (E,E)-farnesol (hydrogen bonds are indicated with blue dashed lines).\nFigure 5 Lowest-energy docked poses of β-sesquiphellandrene, α-zingiberene, phytol, and phytone with SARS-CoV-2 ADP ribose phosphatase (PDB: 6W02). (A) Ribbon structure of the enzyme with β-sesquiphellandrene (brown) and α-zingiberene (yellow). (B) Ribbon structure of the enzyme with phytol (green) and phytone (red).\nFigure 6 Lowest-energy docked ligands with the binding domain of SARS-CoV-2 spike protein and human angiotensin-converting enzyme 2 (ACE2) (PDB: 6M17).\nTable 1 Essential oils showing antiviral activity.\nEssential Oil Major Components Assay IC50 (μg/mL) Reference\nAloysia gratissima (Gillies \u0026 Hook.) Tronc. caryophyllene oxide (15.8%), guaiol (17.4%) a, chrysanthenyl acetate (5.6%), and limonene oxide (5.3%) Plaque reduction assay (Vero cells), HSV-1 65.0 [37]\nAloysia triphylla Royle α-thujone (22.9%), cis−carveol (17.5%), carvone (13.2%), and limonene (12.7%) Plaque reduction assay (Vero cells), HSV-1 \u003e250 [38]\nArtemisia arborescens L. camphor (35.7%), β-thujone (24.0%), and chamazulene (7.7%) Plaque reduction assay (Vero cells), HSV-1 25% inhibition at 100 μg/mL [39]\nArtemisia arborescens L. Artemisia arborescens L. β-thujone (45.0%), camphor (6.8%), and chamazulene (22.7%) c Plaque reduction assay (Vero cells), HSV-1, HSV-2 2.4, 4.1 [40]\nArtemisia douglasiana Besser α-thujone (68.3%) and β-thujone (7.5%) Plaque reduction assay (Vero cells), HSV-1 83 [37]\nArtemisia kermanensis Podlech (syn. Seriphidium kermanense (Podlech) K. Bremer \u0026 Humphries α-thujone (13.8%), camphor (10.2%), and β-thujone (6.2%) Plaque reduction assay (Vero cells), HSV-1 40 [41]\nArtemisia mendozana DC. camphor (22.4%), artemiseole (11.7%), artemisia alcohol (10.8%), and borneol (7.2%) Plaque reduction assay, DENV−2, JUNV and HSV-1 129.3, 178.6, and 153.7 [38]\nArtemisia princeps Pamp. borneol (12.1%), α-thujone (8.7%), τ−cadinol, (6.7%), and 1,8-cineole (6.2%) Plaque reduction assay, murine norovirus−1 64% inhibition at 0.01% [42]\nPlaque reduction assay, feline calicivirus−F9 48% inhibition at 0.1%\nArtemisia vulgaris L. α-thujone (38.1%), β-thujone (10.6%), and 1,8-cineole (8.8%) Virus yield assay (Vero cells), yellow fever virus (YFV) 100 μg/mL (100% inhibition) [43]\nAyapana triplinervis (Vahl) R.M. King \u0026 H. Rob. thymohydroquinone dimethyl ether Plaque reduction assay (A549 cells), Zika virus 38.0 [44]\nBuddleja cordobensis Griseb. caryophyllene oxide (32.1%), β-caryophyllene (16.5%), and α-copaene (8.5%) Plaque reduction assay, DENV−2, JUNV and HSV-1 86.4, 39.0, and 54.1 [38]\nCedrus libani A. Rich. himachalol (22.5%), β-himachalene (21.9%), and α-himachalene (10.5%) Cytopathic effect (CPE) on Vero cells, HSV-1 440 [45]\nCinnamomum zeylanicum Blume (syn. Cinnamomum verum J. Presl) eugenol (75–85%), linalool (1.6−8.5%), (E)−cinnamaldehyde (0.6−1.5%), (E)−cinnamyl acetate (0.7–2.6%), β-caryophyllene (0.5–6.7%), eugenyl acetate (0.1–2.9%), and benzyl benzoate (0.1–8.3%) Influenza type A (H1N1) [46]\nCinnamomum zeylanicum Blume (syn. Cinnamomum verum J. Presl) (E)−cinnamaldehyde (63.9%), eugenol (7.0%), and (E)−cinnamyl acetate (5.1%) c Plaque reduction assay (HeLa cells), HSV-2 82 [47]\nCitrus × bergamia Risso \u0026 Poit. limonene (23–55%), linalool (2–37%), linalyl acetate (12–41%), β-pinene (up to 10%), and γ-terpinene (up to 10%) Influenza virus type A H1N1 100% inhibition at 0.3% [46]\nCitrus limonum Risso limonene (54.6%), γ-terpinene (19.1%), and β-pinene (14.5%) d Plaque reduction assay (Vero cells), HSV-1 2500 [48]\nCitrus reshni Hort ex Tan. (leaf EO) sabinene (40.5%), linalool (23.3%), and terpinen-4-ol (8.3%) Plaque reduction assay, influenza A virus H5N1 19.4% inhibition at 0.1 μL/mL [36]\nCitrus reshni Hort ex Tan. (unripe fruit peel EO) limonene (82.4%) and linalool (7.2%) Plaque reduction assay, influenza A virus H5N1 61.5% inhibition at 1.5 μL/mL [36]\nCitrus reshni Hort ex Tan. (ripe fruit peel EO) limonene (91.6%) Plaque reduction assay, influenza A virus H5N1 50% inhibition at 1.5 μL/mL [36]\nCupressus sempervirens L. α-pinene (51.9%) and δ-3-carene (24.9%) c Plaque reduction assay (Vero cells), HSV-1 6600 [48]\nCymbopogon citratus (DC.) Stapf geranial (40.2%), neral (30.6%), and geraniol (6.7%) c Plaque reduction assay (Vero cells), HSV-1 91 [48]\nCymbopogon flexuosus (Nees) Will. Watson geranial (48–54%) and neral (29–33%) Influenza virus type A (H1N1) [46]\nCynanchum stauntonii (Decne.) Schltr. ex H. Lév. (2E,4E)-decadienal (23.0%), γ-nonalactone (4.2%), 5-pentyl-2(3H)−furanone (3.8%), and 3-isopropyl-1-pentanol (3.5%) Influenza type A (H1N1) 64 [46]\nDysphania ambrosioides (L.) Mosyakin \u0026 Clemants cis-ascaridole (60.7%) and m-cymene (22.2%) Plaque reduction assay, Coxsackie virus B4 21.75 [49]\nEucalyptus astringens (Maiden) Maiden 1,8-cineole (42.0%), α-pinene (22.0%), and trans−pinocarveol (7.0%) Vero cells, Coxsakie virus B3 13.0 [50]\nEucalyptus bicostata Maiden, Blakely \u0026 Simmonds 1,8-cineole (68.0%), globulol (5.4%), and trans−pinocarveol (4.6%) Vero cells, Coxsakie virus B3 13.6 [50]\nEucalyptus caesia Benth. 1,8-cineole (40.2%), p-cymene (14.1%), γ-terpinene (12.4%), α-pinene (7.7%), and terpinen-4-ol (5.6%) Plaque reduction assay (Vero cells), HSV-1 70 [41]\nEucalyptus camaldulensis Dehnh. α-terpinene (26.3%), α-terpineol (9.1%), and camphene (8.5%) e Plaque reduction assay, Rotavirus Wa strain 50% inhibition at 10% EO concentration [51]\nEucalyptus camaldulensis Dehnh. α-terpinene (26.3%), α-terpineol (9.1%), and camphene (8.5%) e Plaque reduction assay, Coxsackie virus B4 53.3% at 10% EO concentration [51]\nEucalyptus camaldulensis Dehnh. α-terpinene (26.3%), α-terpineol (9.1%), and camphene (8.5%) e Plaque reduction assay, HSV-1 90% at 10% EO concentration [51]\nEucalyptus camaldulensis Dehnh. α-terpinene (26.3%), α-terpineol (9.1%), and camphene (8.5%) e Plaque reduction assay, adenovirus type 7 0% at 10% EO concentration [51]\nEucalyptus cinereal F. Muell. ex Benth. 1,8-cineole (70.4%), α-pinene (4.5%), and limonene (3.7%) Vero cells, Coxsakie virus B3 13.0 [50]\nEucalyptus globulus Labill. 1,8-cineole (63.8%) and α-pinene (14.0%) f Plaque reduction assay (Vero cells), HSV-1 1700 [48]\nEucalyptus globulus Labill. 1,8-cineole (63.8%) and α-pinene (14.0%) f Plaque reduction assay (RC-37 cells), HSV-1 55.0 [52]\nEucalyptus lehmannii (Schauer) Benth. 1,8-cineole (59.6%), α-pinene (17.6%), and α-terpineol (8.7%) Vero cells, Coxsakie virus B3 11.5 [50]\nEucalyptus leucoxylon F. Muell. 1,8-cineole (59.2%), α-pinene (7.8%), and α-terpineol (4.3%) Vero cells, Coxsakie virus B3 8.1 [50]\nEucalyptus maidenii F. Muell. 1,8-cineole (57.8%), p-cymene (7.4%), and α-pinene (7.3%) Vero cells, Coxsakie virus B3 14.5 [50]\nEucalyptus odorata Behr cryptone (20.9%), p-cymene (16.7%), phellandral (6.6%), and cuminal (6.6%) Vero cells, Coxsakie virus B3 19.2 [50]\nEucalyptus sideroxylon A. Cunn. ex Woolls 1,8-cineole (69.2%), α-pinene (6.9%), and α-terpineol (5.4%) Vero cells, Coxsakie virus B3 12.3 [50]\nEupatorium patens D. Don ex Hook. \u0026 Arn. germacrene D (36.2%), β-caryophyllene (14.1%), and bicyclogermacrene (7.0%) Plaque reduction assay (Vero cells), HSV-1 125 [37]\nFortunella margarita (Lour.) Swingle (leaf EO) α-terpineol (55.5%), carvone (5.7%), carveol (5.5%), γ-muurolene (5.5%), and citronellal (5.0%) MTT assay, reasserted avian influenza A virus, H5N1 6.77 [53]\nFortunella margarita (Lour.) Swingle (fruit EO) β-eudesmol (28.3%), α-muurolene (10.3%), β-gurjunene (10.0%), γ-eudesmol (8.4%), and γ-muurolene (6.6%) MTT assay, reasserted avian influenza A virus, H5N1 38.89 [53]\nGaillardia megapotamica (Spreng.) Baker β-pinene (24.2%), (Z)-β-ocimene (16.5%), α-pinene (7.7%), limonene (7.5%), and β-caryophyllene (6.7%) Plaque reduction assay, DENV−2, JUNV and HSV-1 140.6, 49.8, and 99.1 [38]\nHeterothalamus alienus (Spreng.) Kuntze β-pinene (35.5%), spathulenol (10.7%), and germacrene D (6.8%) Plaque reduction assay DENV−2, JUNV and HSV-1 122.3, 44.2 and 148.4 [38]\nHeterotheca latifolia Buckley borneol (40.0%), camphor (24.3%), and limonene (5.1%) Plaque reduction assay (Vero cells), HSV-1 \u003e150 [37]\nHouttuynia cordata Thunb. decanal (3.4−8.9%), decanol (up to 7.0%), 2−undecanone (23.0−36.1%), decanoic acid (1.4−6.3%), dodecanal (up to 7.3%), and 2−tridecanone (2.6−5.6%) Influenza type A (H1N1) 48 [54]\nHyptis mutabilis (Rich.) Briq. fenchone (17.1%), 1,8-cineole (12.6%), β-caryophyllene (10.9%), bicyclogermacrene (8.7%), and germacrene D (6.2%) Plaque reduction assay (Vero cells), HSV-2 (Human Herpesvirus type 1) 79.01 [55]\nHyptis mutabilis (Rich.) Briq. germacrene D (15.1%), β-caryophyllene (13.3%), curzerene (13.3%), and bicyclogermacrene (13.2%) Plaque reduction assay (Vero cells) \u003e150 [37]\nHyssopus officinalis L. cis−pinocamphone (40.1%), trans−pinocamphone (13.3%), β-pinene (10.7%), and β-phellandrene (5.3%) c Plaque reduction assay (RC-37 cells), HSV-1 1 [56]\nHyssopus officinalis L. cis−pinocamphone (40.1%), trans−pinocamphone (13.3%), β-pinene (10.7%), and β-phellandrene (5.3%) c Plaque reduction assay (RC-37 cells), HSV-2 6 [57]\nIllicium verum Hook. f. (E)−anethole (90.5%) c Plaque reduction assay (RC-37 cells), HSV-1 40 [58]\nIllicium verum Hook. f. (E)−anethole (90.5%) c Plaque reduction assay (RC-37 cells), HSV-1 1 [59]\nIllicium verum Hook. f. (E)−anethole (90.5%) c Plaque reduction assay (RC-37 cells), HSV-2 30 [57]\nJungia polita Griseb. caryophyllene oxide (9.2%) and β-caryophyllene (8.1%) Plaque reduction assay DENV−2, JUNV and HSV-1 39.8, 134.2 and 136.4 [38]\nJuniperus communis L. α-pinene (46.7%), myrcene (15.0%), sabinene (13.2%), and limonene (7.0%) c Plaque reduction assay (Vero cells), HSV-1 \u003e10000 [48]\nLavandula angustifolia Mill. linalyl acetate (37.0−43.6%), linalool (19.7−39.1%), geraniol (up to 9.3%), β-caryophyllene (up to 5.1%), terpinene−4−ol (up to 14.9%), lavandulol (up to 1.5%), lavandulyl acetate (up to 5.5%), 1,8-cineole (up to 4.1%), and borneol (up to 6.4%) 85% in vitro inhibition of influenza type A (H1N1) [46]\nLavandula latifolia Medik. linalool (31.9%), 1,8-cineole (18.8%), and borneol (10.1%) g Plaque reduction assay (Vero cells), HSV-1 2200 [48]\nLepechinia salviifolia (Kunth) Epling camphor (10.3%), limonene (9.7%), p−mentha−1(7),8−diene (7.4%), α-pinene (6.9%), and γ-terpinene (6.7%) Plaque reduction assay (Vero cells), HSV-1, HSV-2 68.8, 81.9 [55]\nLepechinia vulcanicola J.R.I. Wood limonene (18.9%), germacrene D (10.4%), 1−octen−3−ol (8.8%), β-caryophyllene (8.7%), and α-pinene (8.2%) Plaque reduction assay (Vero cells), HSV-1, HSV-2 112, 68.9 [55]\nLeptospermum scoparium J.R. Forst. \u0026 G. Forst. calamene (16.0%), leptospermone (14.5%), δ−cadinene (6.1%), flavesone (4.5%), viridiflorene (4.4%), and isoleptospermone (3.9%) Plaque reduction assay (RC-37 cells), HSV-1, HSV-2 0.96, 0.58 [60]\nLippia alba (Mill.) N.E. Br. ex Britton \u0026 P. Wilson carvone (51.0%), Limonene (33%), and bicyclosesquiphellandrene (7.0%) Virus yield assay (Vero cells), yellow fever virus (YFV) 100 μg/mL (100% inhibition) [43]\nLippia alba (Mill.) N.E. Br. ex Britton \u0026 P. Wilson carvone (39.7%), limonene (30.6%), and bicyclosesquiphellandrene (8.9%) Plaque reduction assay (Vero cells), DENV−1, DENV−2, DENV−3, DENV−4, YFV 17 DD 10.1, 0.4, 32.6, 21.1, 4.9 [61]\nLippia alba (Mill.) N.E. Br. ex Britton \u0026 P. Wilson carvone (39.7%), limonene (30.6%), and bicyclosesquiphellandrene (8.9%) Plaque reduction assay (Vero cells), Yellow fever (YFV) 4.3 [62]\nLippia citriodora Kunth (syn. Aloysia citriodora Palau) geranial (18.9%), neral (15.6%), limonene (10.7%), and 1,8-cineole (5.0) Plaque reduction assay (Vero cells), DENV−1, DENV−2, DENV−3, DENV−4, YFV 17 DD 1.9, 2.9, 2.6, 33.7, 5.7 [61]\nLippia citriodora Kunth (syn. Aloysia citriodora Palau) geranial (18.9%), neral (15.6%), limonene (10.7%), and 1,8-cineole (5.0) Plaque reduction assay (Vero cells), Yellow fever (YFV) 19.4 [62]\nLippia graveolens Kunth carvacrol (56.8%), o−cymene (32.1%), and γ-terpinene (3.7%) h MTT assay (Mardin−Darby bovine kidney cells), HSV-1, ACVR−HSV-1 (acyclovir−resistant HSV-1), HRSV (human respiratory syncytial virus) 99.6, 55.9, 68.0 [63]\nLippia junelliana (Moldenke) Tronc. piperitenone oxide (= rotundifolone) (36.5%), limonene (23.1%), camphor (7.9%), and spathulenol (6.5%) Plaque reduction assay (Vero cells), HSV-1 \u003e150 [37]\nLippia origanoides carvacrol (44.0%), thymol (15.0%), and γ-terpinene (10.0%) Virus yield assay (Vero cells), yellow fever virus (YFV) 11.1 μg/mL (100% inhibition) [43]\nLippia turbinata Griseb. limonene (60.6%), piperitenone oxide (17.4%), and β-caryophyllene (6.4%) Plaque reduction assay (Vero cells), HSV-1 \u003e 150 [37]\nMatricaria recutita L. α-bisabolol oxide A (13.4–55.9%), α-bisabolol oxide B (8.4–25.1%), bisabolone oxide A (2.9–11.4%), cis−bicycloether (= (Z)−spiroether) (3.6–17.7%), and (E)-β-farnesene (1.9–10.4%) i Plaque reduction assay (RC-37 cells), HSV-1 0.3 [58]\nMatricaria recutita L. α-bisabolol oxide A (13.4–55.9%), α-bisabolol oxide B (8.4–25.1%), bisabolone oxide A (2.9−11.4%), cis−bicycloether (= (Z)−spiroether) (3.6–17.7%), and (E)-β-farnesene (1.9–10.4%) i Plaque reduction assay (RC-37 cells), HSV-2 1.5 [57]\nMelaleuca alternifolia Cheel terpinen-4-ol (36.71%), γ-terpinene (22.20%), and α-terpinene (10.10%) Plaque reduction assay, influenza A⁄PR ⁄ 8 virus subtype H1N1 60 [31]\nMelaleuca alternifolia Cheel terpinen-4-ol (30–48%), γ-terpinene (10–28%), α-terpinene (5–13%), 1,8-cineole (up to 15%), terpinolene (1.5−5%), p-cymene (0.5–12%), α-pinene (1–6%), and α-terpineol (1.5–8%) 100% inhibition of influenza type A (H1N1) virus at 0.01%; type A (H11N9) virus to tea tree oil vapor caused 100% inhibition [46]\nMelaleuca alternifolia Cheel terpinen-4-ol (47.5%), γ-terpinene (20.2%), and α-terpinene (8.6%) c Plaque reduction assay (Vero cells), HSV-1 2700 [48]\nMelaleuca alternifolia Cheel terpinen-4-ol (47.5%), γ-terpinene (20.2%), and α-terpinene (8.6%) c Plaque reduction assay (Vero cells), HSV-1 13.2 [64]\nMelaleuca alternifolia Cheel terpinen-4-ol (47.5%), γ-terpinene (20.2%), and α-terpinene (8.6%) c Plaque reduction assay (RC-37 cells), HSV-1 2 [52]\nMelaleuca alternifolia Cheel terpinen-4-ol (47.5%), γ-terpinene (20.2%), and α-terpinene (8.6%) c Plaque reduction assay (HeLa cells), HSV-2 2700 [47]\nMelaleuca alternifolia Cheel terpinen-4-ol (47.5%), γ-terpinene (20.2%), and α-terpinene (8.6%) c Plaque reduction assay (Vero cells), HSV-1 significant plaque reduction at 10 and 5% v/v [65]\nMelaleuca armillaris (Sol. ex Gaertn.) Sm. 1,8-cineole (33.9%), terpinen-4-ol (18.8%), and γ-terpinene (10.4%) Plaque reduction assay (Vero cells), HSV-1 99% plaque reduction (concentration not given) [66]\nMelaleuca ericifolia Sm. methyl eugenol (96.84%) Plaque reduction assay (Vero cells), HSV-1 91.5% plaque reduction (concentration not given) [66]\nMelaleuca leucadendra (L.) L. 1,8-cineole (64.3%), α-terpineol (11.0%), and valencene (3.91%) Plaque reduction assay (Vero cells), HSV-1 92% plaque reduction (concentration not given) [66]\nMelissa officinalis L. neral (17−32%), geranial (23–43%), linalool (up to 9.0%), citronellal (0.7–20.3%), geraniol (up to 23.2%), β-caryophyllene (up to 11.3%), and caryophyllene oxide (0.4−31.7%) influenza A virus (H9N2) Significant reduction at 5 μg/mL [46]\nMelissa officinalis L. β-cubebene (15.4%), β-caryophyllene (14.2%), α-cadinol (7.2%), geranial (6.6%), and neral (5.8%) Plaque reduction assay (HEp−2 cells), HSV-2 21 [67]\nMelissa officinalis L. geranial (20.1%), β-caryophyllene (17.3%), and neral (13.6%) Plaque reduction assay (RC-37 cells), HSV-1, HSV-2 4, 0.8 [68]\nMentha × piperita L. menthol (42.8%), menthone (14.6%), and isomenthone (5.9%) Plaque reduction assay (RC-37 cells), HSV-1, HSV-2 20, 8 [69]\nMentha × piperita L. menthol (43.8%), menthone (19.7%), menthyl acetate (6.5%), and 1,8-cineole (5.0%) c Plaque reduction assay (Vero cells), HSV-1 2200 [48]\nMentha suaveolens Ehrh. limonene (7.4%), isopulegol (12.0%), and piperitenone oxide (41.8%) Plaque reduction assay, cytopathogenic murine norovirus 0.87 [70]\nMentha suaveolens Ehrh. piperitenone oxide (86.9%) Plaque reduction assay (Vero cells), HSV-1 5.1 [64]\nMinthostachys mollis Griseb. cis−piperitone epoxide (29.9%), piperitenone oxide (25.6%), menthone (7.4%), germacrene D (5.8%), and pulegone (5.5%) Plaque reduction assay (Vero cells), HSV-1, HSV-2 70.7, 68.0 [55]\nOcimum basilicum var. album (L.) Benth. linalool (53.8%) and eugenol (12.6%) j Plaque reduction assay (Vero cells), HSV-1 \u003e10000 [48]\nOcimum campechianum Mill. methyl eugenol (53.9%), β-caryophyllene (13.0%), α-bulnesene (5.4%), germacrene D (3.4%), and α-humulene (3.3%) Plaque reduction assay (Vero cells), HSV-2 74.33 [55]\nOriganum elongatum Emb. (leaf EO) p-cymene (16.2%), γ-terpinene (13.5%), thymol (14.2%), and carvacrol (19.2%) Plaque reduction assay, cytopathogenic murine norovirus 0.37 [70]\nOriganum elongatum Emb. (inflorescence EO) p-cymene (16.1%), γ-terpinene (7.3%), and carvacrol (40.1%), Plaque reduction assay, cytopathogenic murine norovirus 0.75 [70]\nOriganum majorana L. terpinen-4-ol (28.9%), γ-terpinene (14.9%), trans−sabinene hydrate (9.5%), α-terpinene (8.7%), and sabinene (7.2%) c Plaque reduction assay (Vero cells), HSV-1 2800 [48]\nOriganum majorana L. terpinen-4-ol (28.9%), γ-terpinene (14.9%), trans−sabinene hydrate (9.5%), α-terpinene (8.7%), and sabinene (7.2%) c Plaque reduction assay (HeLa cells), HSV-2 520 [47]\nOriganum vulgare L. trans−sabinene hydrate (21.0%), thymol (11.0%), and carvacrol methyl ether (11.0%) Virus yield assay (Vero cells), yellow fever virus (YFV) 100 μg/mL (100% inhibition) [43]\nOsmunda regalis L. hexahydrofarnesyl acetone ( = phytone) (11.8%), 2,4−di−t−butylphenol (6.8%), phytol (6.5%), hexadecene (4.1%), and octadecene (4.4%) Plaque reduction assay, Coxsackie virus B4 type 2 2.24 [71]\nPectis odorata Griseb. limonene (50.2%), neral (27.2%), and geranial (23.6%) Plaque reduction assay DENV−2, JUNV and HSV-1 39.6, 36.6, and 71.5 [38]\nPelargonium graveolens L’Hér. ex Aiton citronellol (21.9–37.5%), citronellyl formate (9.8–20.6%), geraniol (6.0–16.5%), geranyl formate (1.5–6.5%), menthone (up to 13%), isomenthone (up to 9.9%), and linalool (0.8−14.9%) influenza type A (H1N1) 95% inhibition at 0.3% [46]\nPinus mugo Turra δ-3-carene (23.9%), α-pinene (17.9%), β-pinene (7.8%), and β-phellandrene (7.2%) k Plaque reduction assay (RC-37 cells), HSV-1 7 [58]\nRavensara aromatica Sonn. (syn. Cryptocarya agathophylla van der Werff) 1,8-cineole (52.6%), α-terpineol (12.4%), and sabinene (11.0%) l Plaque reduction assay (Vero cells), HSV-1 2800 [48]\nRosmarinus officinalis L. α-pinene (23.9%), verbenone (15.4%), camphor (11.0%), camphene (8.7%), p-cymene (7.5%), and 3−octanone (5.6%) Plaque reduction assay (Vero cells), HSV-1 60 [41]\nRosmarinus officinalis L. 1,8-cineole (45.9%), α-pinene (12.0%), camphor (10.9%), and β-pinene (6.3%) b Plaque reduction assay (Vero cells), HSV-1 2700 [48]\nSalvia fruticosa Mill. 1,8-cineole (47.5%), camphor (9.0%), β-thujone (7.6%), and α-thujone (4.3%) Plaque reduction assay (Vero cells), HSV-1 and HSV-2 1300 [72]\nSantalum album L. (Z)−α-santalol (45.2%), (Z)-β-santalol (25.4%), and (Z)−trans−α-bergamotol (7.8%) c Plaque reduction assay (Vero cells), HSV-1, HSV-2 22.7, 45.3 [73]\nSantalum album L. (Z)−α-santalol (45.2%), (Z)-β-santalol (25.4%), and (Z)−trans−α-bergamotol (7.8%) c Plaque reduction assay (RC-37 cells), HSV-1 2 [56]\nSantalum album L. (Z)−α-santalol (45.2%), (Z)-β-santalol (25.4%), and (Z)−trans−α-bergamotol (7.8%) c Plaque reduction assay (RC-37 cells), HSV-2 5 [57]\nSantolina insularis (Gennari ex Fiori) Arrigoni artemisia ketone (21.2%), allo−aromadendrene (12.7%), 1,8-cineole (9.0%), and camphene (8.5%) m Plaque reduction assay (Vero cells), HSV-1 and HSV-2 0.88, 0.7 [74]\nSatureja hortensis L. carvacrol (32.4%), γ-terpinene (32.0%), thymol (10.0%), and p-cymene (6.6%) Plaque reduction assay (Vero cells), HSV-1 80 [41]\nTessaria absinthioides (Hook. \u0026 Arn.) DC. caryophyllene oxide (12.2%), (E)-β-damascenone, γ-eudesmol (8.5%), α-gurjunene (5.8%), and terpinen-4-ol (5.4%) Plaque reduction assay (Vero cells), HSV-1 105 [37]\nThymus capitatus (L.) Hoffmanns. \u0026 Link (unripe fruit EO) carvacrol (68.6%), p-cymene (4.8%), γ-terpinene (3.0%), and β-caryophyllene (2.9%) Plaque reduction assay, cytopathogenic murine norovirus 0.49 [70]\nThymus capitatus (L.) Hoffmanns. \u0026 Link (ripe fruit EO) carvacrol (58.8%), p-cymene (5.6%), γ-terpinene (2.8%), and β-caryophyllene (2.6%) Plaque reduction assay, cytopathogenic murine norovirus 0.50 [70]\nThymus vulgaris L. thymol (31–50%), p-cymene (0.1–26.6%), and γ-terpinene (up to 22.8%) 100% inhibition of type A (H1N1) virus at 0.3% concentration [46]\nThymus vulgaris L. thymol (43.9%), carvacrol (14.4%), p-cymene (10.5%), β-caryophyllene (7.0%), and γ-terpinene (5.1%) c Plaque reduction assay (RC-37 cells), HSV-1 10 [56]\nThymus vulgaris L. thymol (43.9%), carvacrol (14.4%), p-cymene (10.5%), β-caryophyllene (7.0%), and γ-terpinene (5.1%) c Plaque reduction assay (RC-37 cells), HSV-1 11 [52]\nThymus vulgaris L. thymol (43.9%), carvacrol (14.4%), p-cymene (10.5%), β-caryophyllene (7.0%), and γ-terpinene (5.1%) c Plaque reduction assay (RC-37 cells), HSV-2 7 [57]\nThymus willdenowii Boiss. 1,8-cineole (34.62%), camphor (18.55%), α-pinene (9.46%), and camphene (5.38%) Plaque reduction assay, Coxsackie virus Inactive [75]\nTrachyspermum ammi (L.) Sprague thymol (35–60%), α-pinene, p-cymene, and limonene Plaque reduction assay, Japanese encephalitis virus 80% reduction at 500 μg/mL [76]\nZataria multiflora Boiss. thymol (47.3%), carvacrol (21.9%), p-cymene (8.6%), γ-terpinene (4.2%), and β-caryophyllene (3.0%) Real time PCR (H9N2 subtype of AIV) Reduced viral replication in trachea of broiler chickens [77]\nZataria multiflora Boiss. thymol (33.1%), carvacrol (25.9%), and p-cymene (11.3%) Plaque reduction assay (Vero cells), HSV-1 30 [41]\nZingiber officinale Roscoe α-zingiberene (32.1%), ar−curcumene (15.2%), β-sesquiphellandrene (10.9%), α-farnesene (7.2%), and α-phellandrene (4.4%) Plaque reduction assay, Caprine alphaherpesvirus type I not determined [78]\nZingiber officinale Roscoe α-zingiberene (26.4%), camphene (12.6%), β-sesquiphellandrene (9.2%), ar−curcumene (6.5%), β-phellandrene (6.2%), and β-bisabolene (5.1%) c Plaque reduction assay (RC-37 cells), HSV-1 2 [56]\nZingiber officinale Roscoe α-zingiberene (26.4%), camphene (12.6%), β-sesquiphellandrene (9.2%), ar−curcumene (6.5%), β-phellandrene (6.2%), and β-bisabolene (5.1%) c Plaque reduction assay (RC-37 cells), HSV-2 1 [57]\na Reported as cadinol, but see [79,80]. b Essential oil composition not reported; essential oil composition obtained from [81]. c Essential oil composition not reported; essential oil composition of commercial (dōTERRA International, Pleasant Grove, Utah, USA). d Essential oil composition not reported; essential oil composition obtained from [82]. e Essential oil composition not reported; essential oil composition obtained from [83]. f Essential oil composition not reported; essential oil composition obtained from [84]. g Essential oil composition not reported; essential oil composition obtained from [85]. h Essential oil composition not reported; essential oil composition obtained from [86]. i Essential oil composition not reported; essential oil composition obtained from [87]. j Essential oil composition not reported; essential oil composition obtained from [88]. k Essential oil composition not reported; essential oil composition obtained from [89]. l Essential oil composition not reported; essential oil composition obtained from [90]. m Essential oil composition not reported; essential oil composition obtained from [91].\nTable 2 Antiviral activities of essential oil components.\nEssential Oil Component Assay IC50 (μg/mL) Reference\n(E)−Anethole Plaque reduction assay (RC-37 cells), HSV-1 20 [59]\nCamphor Plaque reduction assay (Vero cells), HSV-1 2600 [72]\nCarvacrol MTT assay (Mardin−Darby bovine kidney (MDBK) cells, HSV-1 48.6 [63]\nβ-Caryophyllene Plaque reduction assay (RC-37 cells), HSV-1 0.25 [59]\nCaryophyllene oxide Plaque reduction assay (RC-37 cells), HSV-1 0.7 [59]\n1,8-Cineole Plaque reduction assay (Vero cells), HSV-1 1800 [72]\n1,8-Cineole Plaque reduction assay (RC-37 cells), HSV-1 1200 [52]\n(E)-Cinnamaldehyde Influenza type A (H1N1) virus 70% at a concentration of 0.53% after 3 h [95]\n(E)-Cinnamaldehyde H1N1 in-vivo by inhalation in a mouse model 89% inhibition [95]\nCitral (Geranial + Neral) Yellow fever (YFV), Vero cells 17.6 [62]\nCitral (Geranial + Neral) Plaque reduction assay (RC-37 cells), HSV-1 3.50 [52]\np-Cymene Influenza, HSV-1, HSV-2, ECHO 9, Cox B1, Polio 1, Adeno 6 \u003e500 [31]\np-Cymene Plaque reduction assay (RC-37 cells), HSV-1 16 [52]\np-Cymene Influenza type A (H1N1) virus Inactive [25]\nDodecanal Influenza type A (H1N1) virus 51 [54]\nβ-Eudesmol Plaque reduction assay (Vero cells), HSV-1 6 [59]\nEugenol Plaque reduction assay (RC-37 cells), HSV-1 35 [59]\nEugenol Plaque reduction assay (RC-37 cells), HSV-1 25.6 [96]\nFarnesol Plaque reduction assay (RC-37 cells), HSV-1 3.5 [59]\nGermacrone Influenza type A (H1N1) virus 1.22–1.55 [97]\nGermacrone Influenza type A (H3N2) virus 0.34 [97]\nGermacrone Influenza type B virus 1.38 [97]\nIsoborneol Plaque reduction assay (Vero cells), HSV-1 \u003c1000 [98]\nNerolidol (natural) Plaque reduction assay (RC-37 cells), HSV-1 4.2 [99]\nNerolidol (synthetic) Plaque reduction assay (RC-37 cells), HSV-1 1.5 [99]\nOctanal Influenza type A (H1N1) virus 15 [54]\nPatchouli alcohol Influenza type A (H1N1) 89% inhibition at 10 μg/mL [100]\nPatchouli alcohol Influenza type A (H2N2) 0.89 [101]\nPatchouli alcohol Influenza type A (H2N2), in-vivo test using a mouse model 70% survival rate at a dose of 5 mg/(kg day) [101]\nα-Pinene Plaque reduction assay (RC-37 cells), HSV-1 4.5 [52]\nPiperitenone oxide Plaque reduction assay (Vero cells) 1.4 [64]\nα-Terpinene Influenza type A (H1N1) virus Inactive [25]\nα-Terpinene Influenza, HSV-1, HSV-2, ECHO 9, Cox B1, Polio 1, Adeno 4 \u003e12 [31]\nα-Terpinene Plaque reduction assay (RC-37 cells), HSV-1 8.5 [52]\nγ-Terpinene Plaque reduction assay (RC-37 cells), HSV-1 7 [52]\nγ-Terpinene Influenza, HSV-1, HSV-2, ECHO 9, Cox B1, Polio 1, Adeno 5 \u003e120 [31]\nγ-Terpinene influenza type A (H1N1) virus inactive [25]\nTerpinen-4-ol Influenza, HSV-1, HSV-2, ECHO 9, Cox B1, Polio 1, Adeno 2 25 (influenza)\u003e50 (others) [31]\nTerpinen-4-ol Plaque reduction assay (Vero cells), HSV-1 60 [52]\nα-Terpineol Plaque reduction assay (RC-37 cells), HSV-1 22 [52]\nTerpinolene Influenza, HSV-1, HSV-2, ECHO 9, Cox B1, Polio 1, Adeno 3 12 (influenza)\u003e12 (others) [31]\nThujones (α \u0026 β) Plaque reduction assay (RC-37 cells), HSV-1 400 [72]\nThymol Influenza type A (H1N1) virus Active [25]\nThymol Plaque reduction assay (RC-37 cells), HSV-1 30 [52]\n2-Undecanone influenza type A (H1N1) virus 62 [54]\nTable 3 Docking scores, normalized for molecular weight (DSnorm, kJ/mol), of essential oil components with severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) molecular targets.\nCompound MainProtease Endoribo-Nuclease ADP RibosePhosphatase RNA-DependentRNA Polymerase Spike ProteinBinding Domain Angiotensin-Converting Enzyme a\n(E)-Anethole −84.9 −83.0 −97.5 −74.0 −65.2 −83.8\nallo-Aromadendrene −86.6 −86.9 −95.8 −74.9 −66.1 −85.3\nArtemiseole −89.2 −83.4 −96.6 −73.0 −67.8 −78.0\n(R)-Artemisia alcohol −84.3 −78.3 −88.2 −66.8 −61.1 −74.7\n(S)-Artemisia alcohol −86.1 −85.4 −98.5 −69.5 −67.1 −77.4\nArtemisia ketone −91.0 −85.7 −97.9 −71.9 −66.9 −77.3\nAscaridole −74.8 −68.2 −86.0 −65.2 −62.6 −64.4\nBenzyl benzoate −104.9 −96.5 −110.3 −82.5 −74.9 −96.4\n(Z)-trans-α-Bergamotol −98.0 −91.2 −105.9 −71.9 −63.6 −83.6\nBicyclogermacrene −85.9 −88.0 −92.5 −75.6 −68.2 −86.1\nBicyclosesquiphellandrene −79.4 −89.6 −86.0 −61.8 −62.5 −78.2\nα-Bisabolol oxide A −88.5 −87.6 −89.1 −71.5 −63.5 −89.7\nα-Bisabolol oxide B −96.6 −92.2 −101.0 −79.7 −75.2 −95.6\nBisabolone oxide A −93.7 −87.9 −98.2 −73.3 −71.0 −78.7\n(+)-Borneol −77.4 −91.8 −100.1 −74.1 −70.9 −73.3\n(−)-Borneol −71.4 −71.5 −78.4 −56.7 −50.1 −73.7\n(+)-iso-Borneol −75.6 −75.3 −75.9 −60.8 −53.2 −71.8\n(−)-iso-Borneol −73.8 −69.2 −75.6 −54.8 −49.3 −72.4\nα-Bulnesene −95.2 −72.4 −78.4 −57.0 −57.8 −101.7\nδ-Cadinene −91.6 −90.2 −112.6 −75.2 −60.0 −93.4\nτ-Cadinol −92.3 −82.8 −82.5 −69.9 −69.8 −87.8\n(R)-Calamene −92.3 −83.5 −97.4 −69.0 −65.6 −87.3\n(S)-Calamene −88.4 −86.8 −95.9 −70.2 −64.7 −87.5\n(+)-Camphene −85.6 −78.9 −83.2 −64.4 −57.9 −72.2\n(−)-Camphene −77.2 −74.1 −87.1 −66.0 −59.8 −67.1\n(+)-Camphor −75.2 −73.1 −77.9 −63.9 −53.8 −69.4\n(−)-Camphor −72.5 −70.0 −75.6 −64.3 −52.8 −70.8\n(+)-δ-3-Carene −87.9 −78.6 −87.0 −65.0 −72.4 −75.8\n(−)-δ-3-Carene −83.9 −88.0 −90.4 −66.8 −67.3 −73.4\nCarvacrol −84.5 −86.6 −94.8 −74.1 −71.0 −81.2\nCarvacrol methyl ether −85.5 −82.5 −103.1 −74.6 −65.8 −83.7\n(+)-cis−Carveol −87.0 −81.8 −97.7 −76.5 −69.7 −80.4\n(−)-cis−Carveol −85.6 −85.0 −95.6 −76.8 −74.3 −81.2\n(R)-Carvone −87.7 −82.4 −98.2 −74.7 −69.2 −83.4\n(S)-Carvone −86.2 −83.2 −98.9 −73.2 −66.3 −82.2\n(E)-Caryophyllene −81.2 −82.2 −93.9 −73.4 −59.2 −75.1\nCaryophyllene oxide −80.6 −86.7 −97.0 −74.1 −66.5 −83.3\nCedrol −82.3 −84.4 −80.1 −69.7 −58.3 −69.9\nepi-Cedrol −76.4 −88.4 −92.2 −68.5 −55.5 −75.9\nChamazulene −97.6 −96.4 −110.9 −76.9 −73.7 −95.6\n(−)-cis-Chrystanthyl acetate −83.2 −77.5 −87.1 −71.5 −60.2 −80.9\n(−)-trans−Chrysanthenyl acetate −77.0 −81.4 −85.3 −65.9 −68.9 −72.4\n1,8-Cineole −72.7 −67.6 −71.5 −58.1 −58.6 −61.0\n(E)-Cinnamaldehyde −93.1 −85.8 −100.0 −76.4 −73.1 −81.0\n(E)-Cinnamyl acetate −99.4 −88.0 −108.9 −76.9 −80.6 −89.5\n(R)-Citronellal −99.9 −91.6 −105.0 −75.1 −73.3 −88.0\n(S)-Citronellal −98.3 −88.9 −107.4 −72.1 −71.4 −86.2\n(R)-Citronellol −99.9 −90.2 −104.9 −75.7 −72.3 −84.9\n(S)-Citronellol −99.2 −92.2 −107.6 −74.2 −77.4 −85.1\n(R)-Citronellyl formate −105.5 −92.6 −109.9 −72.8 −76.2 −90.5\n(S)-Citronellyl formate −101.5 −96.4 −114.7 −81.9 −78.3 −91.0\nα-Copaene −84.1 −78.9 −85.9 −60.2 −59.6 −77.1\nCostunolide −94.5 −99.2 −110.2 −78.2 −74.9 −92.6\n(R)-Cryptone −86.6 −82.4 −93.5 −68.2 −70.4 −74.8\n(S)-Cryptone −81.5 −82.9 −94.9 −69.8 −70.6 −76.6\nβ-Cubebene −90.8 −92.0 −86.7 −76.0 −71.2 −89.8\nCuminaldehyde −86.2 −80.5 −103.3 −74.9 −67.5 −81.7\nar-Curcumene −105.3 −94.0 −108.6 −82.8 −75.8 −96.4\nCurcumol −83.0 −93.4 −91.2 −73.5 −69.6 −86.0\nCurdione −86.2 −98.1 −99.0 −77.3 −71.7 −92.0\nCurzerene −91.5 −86.0 −104.2 −76.8 −67.6 −90.5\nm-Cymene −83.6 −81.3 −92.8 −72.0 −67.6 −79.0\no-Cymene −83.2 −78.3 −87.7 −63.9 −63.3 −72.9\np-Cymene −79.7 −78.7 −91.0 −70.3 −63.9 −75.4\n(E)-β-Damascenone −85.2 −87.6 −110.2 −73.8 −73.8 −84.8\n(2E,4E)-Decadienal −105.7 −97.7 −112.5 −81.8 −78.7 −90.0\nDodecanal −102.8 −93.9 −101.9 −77.9 −73.3 −94.9\nEremanthin −97.7 −97.7 −98.0 −83.7 −81.3 −100.9\nβ-Eudesmol −97.6 −87.4 −106.5 −75.8 −64.5 −74.7\nγ-Eudesmol −93.6 −89.9 −94.7 −69.4 −66.1 −84.3\nEugenol −93.2 −91.7 −105.2 −80.0 −79.1 −88.4\nEugenol methyl ether −88.5 −85.3 −111.1 −71.7 −68.6 −89.3\nEugenyl acetate −96.3 −89.3 −115.1 −75.6 −70.6 −94.9\n(E,E)-α-Farnesene −115.0 −107.5 −112.8 −86.8 −85.3 −100.3\n(E)-β-Farnesene −115.4 −105.0 −116.3 −87.1 −82.9 −100.7\n(E,E)-Farnesol −112.4 −104.6 −121.4 −89.6 −80.8 −100.9\n(+)-Fenchone −80.0 −80.9 −87.1 −66.1 −60.8 −66.9\n(-)-Fenchone −83.3 −67.5 −86.2 −66.5 −60.9 −68.8\nFlavesone −82.3 −84.0 −95.7 −68.9 −64.4 −78.9\nGeranial −101.7 −90.8 −113.0 −76.1 −74.5 −92.0\nGeraniol −103.5 −98.5 −110.2 −77.4 −76.4 −93.8\nGeranyl formate −105.9 −93.9 −111.4 −80.8 −80.3 −96.2\nGermacrene D −92.1 −96.7 −110.5 −77.1 −73.0 −87.3\nGermacrone −85.1 −97.1 −94.9 −71.6 −67.1 −80.9\nGuiaol −94.1 −92.5 −113.4 −79.2 −79.4 −91.9\nα-Gurjunene −89.9 −83.2 −81.3 −71.5 −61.3 −79.8\nβ-Gurjunene −77.4 −64.1 −81.1 −64.1 −58.0 −75.1\nα-Himachalene −80.4 −89.7 −86.5 −63.7 −67.9 −74.3\nβ-Himachalene −85.5 −81.3 −88.6 −68.1 −62.9 −77.2\nHimachalol −77.2 −88.3 −100.8 −63.6 −63.7 −75.6\nα-Humulene −88.9 −90.9 −89.1 −74.9 −70.6 −86.7\nLeptospermone −85.5 −83.2 −92.9 −71.2 −64.1 −80.0\niso-Leptospermone −86.1 −82.7 −93.7 −69.1 −62.6 −83.5\n(R)-Limonene −82.2 −76.2 −92.0 −72.6 −67.3 −79.0\n(S)-Limonene −82.2 −73.8 −92.2 −72.4 −66.1 −77.5\n(R,S,R)-Limonene oxide −86.3 −77.7 −100.8 −76.7 −68.1 −85.1\n(S,R,R)-Limonene oxide −83.5 −87.4 −89.4 −66.7 −63.4 −76.4\n(S,R,S)-Limonene oxide −84.7 −80.7 −95.8 −74.9 −66.7 −83.8\n(R)-Linalool −96.0 −89.3 −101.4 −70.9 −79.0 −87.0\n(S)-Linalool −100.7 −87.5 −102.1 −71.4 −70.4 −87.8\n(R)-Linalyl acetate −101.4 −88.9 −105.1 −73.0 −74.3 −82.5\n(S)-Linalyl acetate −102.8 −90.8 −106.0 −68.5 −74.5 −82.3\np-Mentha-1(7),8-diene −82.3 −82.2 −94.3 −69.5 −65.9 −79.3\n(+)-Menthol −82.9 −86.2 −95.0 −71.8 −66.6 −77.7\n(-)-Menthol −82.3 −84.5 −95.1 −71.1 −69.2 −79.4\nMenthone −83.2 −77.8 −94.7 −69.3 −70.0 −74.4\niso-Menthone −81.0 −79.8 −97.6 −64.4 −63.5 −80.1\nα-Muurolene −86.9 −81.9 −96.9 −72.0 −66.0 −83.7\n(+)-γ-Muurolene −82.3 −82.9 −83.1 −72.2 −66.6 −84.4\n(-)-γ-Muurolene −88.4 −86.2 −106.7 −74.5 −68.5 −86.8\nMyrcene −98.7 −90.1 −102.2 −74.9 −71.4 −84.3\nNeral −102.6 −91.8 −110.5 −81.5 −72.4 −91.2\n(E)-Nerolidol −110.7 −101.4 −113.8 −83.5 −76.1 −100.6\n(E)-β-Ocimene −97.0 −90.2 −103.6 −76.3 −75.6 −86.7\n(Z)-β-Ocimene −98.3 −88.7 −103.2 −78.6 −73.9 −85.1\nOctanal −89.7 −83.8 −99.5 −71.3 −72.4 −80.5\n(R)-2-Octen-3-ol −88.1 −88.4 −96.6 −71.9 −70.7 −81.9\n(S)-1-Octen-3-ol −94.2 −90.7 −93.4 −77.1 −74.7 −80.0\n3-Octanone −88.9 −85.3 −94.7 −71.7 −72.9 −80.3\nPatchouli alcohol −63.5 −57.1 −66.7 −51.8 −43.0 −67.9\n(R)-Phellandral −87.6 −85.9 −102.5 −74.4 −66.2 −81.1\n(S)-Phellandral −87.7 −83.7 −101.6 −74.4 −66.5 −79.2\n(R)-α-Phellandrene −81.1 −82.9 −92.5 −70.1 −65.3 −76.4\n(S)-α-Phellandrene −81.6 −82.5 −92.3 −69.7 −65.6 −76.6\n(R)-β-Phellandrene −84.4 −83.7 −94.0 −69.8 −65.5 −75.2\n(S)-β-Phellandrene −82.9 −84.5 −94.0 −71.2 −67.5 −77.7\nPhytol −106.3 −94.2 −118.9 −74.9 −75.6 −93.3\nPhytone −106.4 −94.3 −116.9 −79.8 −72.3 −90.4\n(+)-α-Pinene −79.0 −70.7 −79.7 −59.4 −54.6 −63.7\n(-)-α-Pinene −77.3 −70.4 −72.9 −61.3 −54.7 −63.6\n(+)-β-Pinene −76.8 −71.8 −79.4 −63.7 −53.0 −65.2\n(-)-β-Pinene −78.8 −73.6 −73.9 −61.9 −56.1 −64.7\n(+)-Pinocamphone −74.9 −72.6 −79.4 −63.2 −62.4 −66.4\n(-)-Pinocamphone −73.2 −79.3 −81.8 −62.0 −61.4 −67.2\n(+)-iso-Pinocamphone −74.9 −75.0 −74.9 −66.6 −55.1 −66.5\n(-)-iso-Pinocamphone −77.1 −80.7 −77.5 −64.0 −55.6 −68.3\n(+)-cis-Pinocarveol −73.9 −78.1 −79.5 −67.7 −57.4 −70.2\n(-)-cis-Pinocarveol −74.1 −76.5 −78.8 −67.0 −58.6 −66.3\n(+)-trans-Pinocarveol −74.7 −80.5 −78.7 −65.8 −57.2 −70.6\n(-)-trans-Pinocarveol −77.6 −80.0 −82.6 −60.5 −55.5 −70.8\n(+)-Piperitone oxide −82.0 −81.5 −98.5 −66.2 −65.2 −77.8\n(-)-Piperitone oxide −81.6 −83.9 −94.9 −68.6 −60.8 −82.8\n(-)-iso-Pulegol −82.5 −85.1 −98.8 −75.2 −66.7 −79.3\n(R)-Pulegone −84.0 −83.1 −96.1 −66.4 −65.5 −78.3\n(S)-Pulegone −83.6 −78.6 −93.3 −67.2 −66.2 −78.9\nRotundifolone −83.1 −79.0 −96.6 −66.4 −62.1 −80.7\n(+)-Sabinene −86.4 −84.0 −92.2 −70.5 −68.6 −77.4\n(-)-Sabinene −87.8 −85.9 −94.7 −71.5 −69.6 −77.0\ncis-Sabinene hydrate −82.4 −81.1 −92.4 −68.0 −60.8 −78.2\n(Z)-α-Santalol −105.7 −95.3 −108.8 −84.7 −70.7 −95.8\n(E)-β-Santalol −104.8 −95.6 −106.2 −77.0 −70.9 −86.6\n(Z)-β-Santalol −104.4 −94.4 −106.2 −79.8 −73.2 −92.2\nβ-Sesquiphellandrene −103.8 −99.0 −115.7 −84.8 −75.3 −101.1\nSpathulenol −90.7 −88.0 −98.4 −77.8 −67.9 −90.4\n(Z)-Spiroether −111.8 −84.9 −103.1 −87.1 −79.3 −102.0\nγ-Terpinene −81.3 −79.3 −93.2 −71.2 −65.3 −76.6\n(R)-Terpinen-4-ol −80.4 −81.9 −89.5 −69.0 −64.9 −75.3\n(S)-Terpinen-4-ol −82.1 −81.8 −88.0 −70.4 −64.4 −76.4\n(R)-α-Terpineol −82.6 −88.3 −91.6 −65.6 −66.0 −72.6\n(S)-α-Terpineol −88.7 −86.8 −94.1 −71.6 −63.5 −82.0\nTerpinolene −80.7 −80.1 −94.7 −68.8 −63.9 −77.4\n(-)-α-Thujone −87.2 −89.3 −94.5 −66.9 −69.2 −78.1\n(+)-β-Thujone −86.9 −80.5 −94.2 −73.7 −69.7 −79.2\nThymohydroquinone dimethyl ether −89.5 −82.8 −104.6 −73.1 −67.0 −85.0\nThymol −84.4 −87.5 −94.6 −72.9 −70.8 −78.4\n2-Undecanone −101.3 −94.0 −108.3 −78.4 −72.8 −90.2\nValencene −84.7 −81.7 −92.6 −74.4 −68.3 −81.7\n(+)-Verbenone −84.7 −73.2 −82.5 −68.4 −54.8 −71.2\n(-)-Verbenone −83.8 −77.7 −77.4 −65.4 −57.8 −68.0\nViridiflorene −86.8 −90.2 −91.0 −76.3 −69.4 −88.8\nα-Zingiberene −106.4 −100.5 −115.4 −82.7 −71.4 −98.6\na Human angiotensin-converting enzyme 2 (hACE2).\nTable 4 Normalized docking scores ( DSnorm, kJ/mol) of essential oil components with bovine odorant binding protein (BtOBP), cruzain, torpedo acetylcholinesterase (TcAChE), Bacillus anthracis nicotinate mononucleotide adenylytransferase (BaNadD), Russell’s viper phospholipase A2 (DrPLA2), and Escherichia coli l-aspartate aminotransferase (EcAspTA).\nCompound BtOBP Cruzain TcAChE BaNadD DrPLA2 EcAspTA\n1GT3 1ME3 6G1U 3HFJ 1FV0 2Q7W\n(E)-Anethole −90.2 −73.3 −96.8 −112.9 −85.3 −88.1\nallo-Aromadendrene −85.0 −70.6 −92.8 −105.8 −87.8 −79.6\nArtemiseole −84.8 −74.2 −84.2 −90.6 −68.0 −71.7\n(R)-Artemisia alcohol −88.4 −68.3 −89.5 −94.8 −80.7 −81.5\n(S)-Artemisia alcohol −86.1 −74.0 −94.8 −101.4 −82.5 −81.4\nArtemisia ketone −93.1 −77.3 −91.5 −107.9 −87.8 −80.6\nAscaridole −79.7 −54.4 −72.1 −79.7 −75.0 −65.3\nBenzyl benzoate −105.0 −82.8 −115.8 −128.1 −97.3 −89.9\n(Z)-trans-α-Bergamotol −1 00.7 −73.6 −107.0 −94.2 −92.6 −85.8\nBicyclogermacrene −97.5 −82.4 −95.6 −105.5 −89.7 −89.0\nBicyclosesquiphellandrene −92.2 −52.5 −91.2 −110.7 −88.4 −75.7\nα-Bisabolol oxide A −94.7 −66.1 −102.8 −102.6 −77.1 −82.7\nα-Bisabolol oxide B −104.6 −90.4 −107.0 −121.9 −94.2 −89.8\nBisabolone oxide A −100.1 −71.9 −96.8 −84.7 −81.2 −86.7\n(+)-Borneol −72.5 −51.0 −72.0 −47.8 −61.4 −62.5\n(-)-Borneol −78.3 −53.1 −70.8 −49.0 −63.3 −56.2\n(+)-iso-Borneol −73.7 −55.6 −74.6 −31.0 −60.9 −59.7\n(-)-iso-Borneol −73.2 −55.3 −77.7 −52.6 −51.0 −57.4\nα-Bulnesene −93.4 −89.3 −109.3 −115.7 −94.4 −95.3\nδ-Cadinene −79.5 −86.8 −105.1 −116.8 −94.8 −82.3\nΤ-Cadinol −87.8 −71.8 −117.7 −121.7 −86.0 −87.0\n(R)-Calamene −80.3 −84.4 −116.5 −120.4 −91.3 −87.7\n(S)-Calamene −80.1 −82.5 −116.2 −121.8 −93.0 −88.3\n(+)-Camphene −79.0 −62.1 −77.0 −75.9 −69.3 −67.5\n(-)-Camphene −77.7 −62.8 −75.2 −77.4 −71.3 −70.6\n(+)-Camphor −76.0 −57.0 −75.0 −49.0 −53.5 −54.1\n(-)-Camphor −80.0 −54.1 −74.4 −52.9 −61.2 −56.4\n(+)-δ-3-Carene −80.4 −64.2 −80.6 −88.0 −71.8 −72.5\n(-)-δ-3-Carene −82.0 −68.9 −84.4 −90.2 −72.8 −72.9\nCarvacrol −82.4 −77.7 −94.8 −106.7 −81.6 −87.5\nCarvacrol methyl ether −85.6 −79.3 −96.6 −111.5 −84.2 −93.6\n(+)-cis-Carveol −89.1 −77.3 −96.9 −109.4 −81.3 −87.6\n(-)-cis-Carveol −89.0 −82.1 −95.5 −109.0 −83.2 −89.4\n(R)-Carvone −86.0 −80.7 −94.6 −109.9 −83.5 −91.5\n(S)-Carvone −88.0 −77.2 −94.1 −105.9 −82.8 −87.2\n(E)-Caryophyllene −87.3 −60.4 −88.1 −87.3 −87.4 −78.6\nCaryophyllene oxide −95.1 −73.1 −90.1 −97.0 −83.8 −77.8\nCedrol −87.7 −63.1 −96.4 −84.4 −86.3 −70.9\nepi-Cedrol −84.0 −59.7 −83.3 −86.7 −80.0 −76.2\nChamazulene −95.2 −89.2 −123.0 −132.1 −98.9 −101.6\n(-)-cis-Chrystanthyl acetate −85.8 −63.7 −89.8 −73.8 −76.5 −71.5\n(-)-trans-Chrysanthenyl acetate −80.9 −69.7 −82.4 −78.5 −76.5 −68.6\n1,8-Cineole −69.3 −51.1 −73.2 −54.4 −49.4 −47.3\n(E)-Cinnamaldehyde −87.7 −77.6 −98.2 −110.1 −85.7 −89.5\n(E)-Cinnamyl acetate −95.9 −88.2 −107.4 −132.5 −94.6 −103.1\n(R)-Citronellal −98.1 −90.5 −109.3 −120.7 −88.3 −105.7\n(S)-Citronellal −95.0 −89.7 −108.5 −123.3 −86.9 −104.1\n(R)-Citronellol −91.0 −90.0 −108.2 −122.4 −88.6 −107.7\n(S)-Citronellol −92.5 −91.9 −108.5 −122.0 −90.3 −100.3\n(R)-Citronellyl formate −98.0 −93.5 −118.7 −129.5 −87.5 −108.5\n(S)-Citronellyl formate −99.7 −95.1 −111.2 −135.6 −91.5 −94.8\nα-Copaene −88.9 −69.9 −84.6 −78.7 −81.7 −61.9\nCostunolide −106.8 −87.5 −116.7 −120.1 −100.3 −89.1\n(R)-Cryptone −74.9 −68.1 −92.2 −100.0 −78.5 −80.8\n(S)-Cryptone −79.0 −68.5 −91.6 −100.7 −82.7 −79.6\nβ-Cubebene −99.8 −67.2 −106.9 −112.2 −93.9 −94.8\nCuminaldehyde −84.9 −79.1 −95.3 −109.1 −90.1 −89.5\nar-Curcumene −98.1 −87.5 −116.0 −125.7 −94.1 −95.3\nCurcumol −90.1 −67.6 −100.4 −88.0 −87.6 −81.5\nCurdione −96.4 −75.1 −99.3 −116.3 −91.0 −78.7\nCurzerene −96.4 −80.3 −109.4 −89.7 −91.1 −86.4\nm-Cymene −78.9 −73.1 −96.1 −99.1 −76.6 −88.0\no-Cymene −77.0 −61.9 −89.8 −97.8 −76.2 −77.2\np-Cymene −82.8 −73.2 −91.3 −96.8 −80.9 −84.3\n(E)-β-Damascenone −90.1 −80.5 −100.7 −105.4 −88.9 −80.0\n(2E,4E)-Decadienal −96.4 −87.0 −110.4 −129.7 −95.8 −114.8\nDodecanal −95.8 −83.7 −110.3 −127.3 −89.2 −108.9\nEremanthin −80.1 −87.9 −121.3 −132.4 −98.7 −91.8\nβ-Eudesmol −95.2 −76.1 −98.6 −114.1 −85.3 −87.1\nγ-Eudesmol −94.9 −78.2 −106.1 −105.2 −89.7 −89.1\nEugenol −90.4 −82.4 −103.9 −119.3 −87.3 −98.8\nEugenol methyl ether −93.6 −78.1 −106.3 −116.8 −89.3 −94.4\nEugenyl acetate −94.9 −83.4 −109.2 −126.1 −100.1 −104.6\n(E,E)-α-Farnesene −115.5 −103.7 −129.8 −131.8 −101.2 −111.4\n(E)-β-Farnesene −112.1 −103.2 −122.7 −131.8 −105.3 −108.6\n(E,E)-Farnesol −116.8 −96.2 −133.0 −135.6 −100.5 −109.0\n(+)-Fenchone −78.4 −60.5 −79.5 −79.8 −62.4 −69.9\n(-)-Fenchone −80.3 −61.5 −81.0 −84.2 −65.5 −60.7\nFlavesone −87.1 −56.0 −88.6 −92.1 −85.2 −80.3\nGeranial −96.5 −94.9 −111.7 −119.3 −92.1 −101.5\nGeraniol −95.5 −93.6 −109.7 −118.0 −94.3 −107.3\nGeranyl formate −100.2 −89.7 −115.4 −128.3 −94.8 −114.1\nGermacrene D −102.4 −88.8 −109.9 −116.5 −93.7 −90.0\nGermacrone −92.4 −68.3 −94.5 −102.9 −88.3 −80.0\nGuiaol −100.8 −88.5 −113.3 −107.5 −92.6 −94.0\nα-Gurjunene −80.6 −61.6 −84.6 −100.0 −83.6 −78.1\nβ-Gurjunene −89.3 −38.8 −80.3 11.3 −77.6 −71.1\nα-Himachalene −89.2 −67.9 −83.9 −96.3 −87.6 −73.4\nβ-Himachalene −81.9 −65.4 −96.1 −110.8 −91.4 −76.8\nHimachalol −91.5 −64.1 −81.2 −24.7 −81.7 −66.3\nα-Humulene −94.0 −80.0 −89.9 −113.6 −89.2 −82.5\nLeptospermone −89.6 −64.0 −92.2 −102.7 −88.8 −80.7\niso-Leptospermone −92.8 −63.0 −90.1 −99.4 −86.2 −78.2\n(R)-Limonene −86.2 −75.7 −92.4 −99.6 −81.7 −86.8\n(S)-Limonene −84.9 −77.6 −93.4 −99.8 −83.3 −87.3\n(R,S,R)-Limonene oxide −87.1 −76.0 −93.2 −110.7 −84.9 −86.3\n(S,R,R)-Limonene oxide −84.6 −68.8 −85.0 −84.3 −76.2 −69.8\n(S,R,S)-Limonene oxide −91.2 −73.8 −97.4 −93.6 −85.1 −87.9\n(R)-Linalool −95.5 −89.9 −116.6 −112.4 −90.3 −89.9\n(S)-Linalool −93.0 −88.9 −110.1 −111.9 −91.0 −95.7\n(R)-Linalyl acetate −96.9 −87.1 −107.1 −112.5 −87.1 −95.2\n(S)-Linalyl acetate −100.0 −90.5 −110.2 −114.3 −86.6 −87.1\np-Mentha-1(7),8-diene −83.3 −74.4 −93.6 −100.0 −82.9 −84.9\n(+)-Menthol −86.1 −66.4 −98.6 −106.1 −79.2 −90.8\n(-)-Menthol −81.0 −68.9 −97.5 −106.3 −80.5 −89.7\nMenthone −82.4 −72.0 −92.6 −98.2 −82.8 −83.5\niso-Menthone −79.9 −64.8 −88.2 −102.4 −75.1 −82.0\nα-Muurolene −91.2 −79.9 −95.6 −113.7 −90.0 −82.8\n(+)-γ-Muurolene −85.2 −77.0 −98.7 −113.9 −93.2 −78.7\n(-)-γ-Muurolene −83.1 −83.4 −96.9 −106.3 −82.9 −80.5\nMyrcene −90.4 −88.8 −109.0 −112.7 −90.3 −101.1\nNeral −95.1 −94.1 −111.1 −122.8 −90.9 −105.4\n(E)-Nerolidol −111.5 −101.8 −131.9 −131.3 −99.6 −110.5\n(E)-β-Ocimene −91.8 −89.4 −104.6 −116.4 −89.0 −97.0\n(Z)-β-Ocimene −89.7 −90.6 −106.8 −112.1 −90.3 −94.4\nOctanal −85.8 −79.8 −97.6 −112.0 −85.7 −102.7\n(R)-2-Octen-3-ol −84.3 −81.5 −106.9 −107.1 −83.3 −101.1\n(S)-1-Octen-3-ol −84.5 −82.4 −108.4 −105.9 −85.0 −99.5\n3-Octanone −84.2 −82.5 −102.6 −111.6 −82.9 −101.8\nPatchouli alcohol −75.1 −41.4 −71.1 100.1 −10.1 −49.2\n(R)-Phellandral −92.3 −79.3 −97.4 −108.1 −88.9 −89.5\n(S)-Phellandral −92.9 −79.9 −96.1 −109.2 −88.9 −88.8\n(R)-α-Phellandrene −84.0 −69.7 −94.7 −100.8 −82.4 −83.8\n(S)-α-Phellandrene −84.3 −69.6 −93.5 −99.4 −82.6 −80.6\n(R)-β-Phellandrene −82.2 −69.9 −93.5 −102.0 −80.6 −84.1\n(S)-β-Phellandrene −83.8 −69.0 −93.2 −100.5 −80.2 −81.2\nPhytol −112.8 −93.8 −132.4 −134.7 −102.4 −112.9\nPhytone −117.8 −92.1 −124.5 −131.1 −99.7 −107.2\n(+)-α-Pinene −74.2 −58.0 −73.4 −62.4 −62.5 −54.4\n(-)-α-Pinene −72.8 −58.3 −70.4 −64.6 −61.7 −57.2\n(+)-β-Pinene −70.9 −57.8 −74.0 −64.1 −60.9 −55.5\n(-)-β-Pinene −73.5 −58.4 −73.1 −65.0 −63.7 −57.0\n(+)-Pinocamphone −76.5 −58.2 −73.6 −53.1 −55.4 −63.6\n(-)-Pinocamphone −76.6 −66.1 −76.5 −65.9 −72.3 −62.7\n(+)-iso-Pinocamphone −75.3 −59.0 −76.6 −54.0 −59.1 −58.1\n(-)-iso-Pinocamphone −76.2 −59.6 −76.7 −56.4 −65.8 −56.2\n(+)-cis-Pinocarveol −75.7 −58.2 −75.2 −51.7 −57.5 −58.1\n(-)-cis-Pinocarveol −75.7 −63.9 −73.5 −52.5 −66.3 −54.5\n(+)-trans-Pinocarveol −77.5 −60.6 −76.5 −71.1 −63.9 −61.4\n(-)-trans-Pinocarveol −72.4 −58.6 −77.2 −71.4 −56.3 −62.6\n(+)-Piperitone oxide −88.5 −70.5 −100.5 −104.2 −80.4 −78.0\n(-)-Piperitone oxide −86.0 −73.6 −99.6 −104.5 −80.7 −83.8\n(-)-iso-Pulegol −85.1 −72.0 −93.5 −106.7 −83.5 −93.8\n(R)-Pulegone −81.8 −69.9 −90.3 −103.9 −78.4 −74.4\n(S)-Pulegone −79.7 −69.6 −89.3 −99.9 −81.5 −76.4\nRotundifolone −86.1 −72.1 −96.1 −100.0 −82.4 −72.1\n(+)-Sabinene −87.9 −66.6 −84.5 −92.1 −80.5 −78.2\n(-)-Sabinene −79.7 −68.4 −91.4 −96.0 −80.8 −75.8\ncis-Sabinene hydrate −88.1 −70.2 −84.5 −91.1 −72.3 −68.1\n(Z)-α-Santalol −108.5 −85.6 −113.4 −106.8 −96.8 −90.7\n(E)-β-Santalol −105.0 −90.2 −110.6 −113.3 −94.3 −94.0\n(Z)-β-Santalol −108.0 −85.3 −110.4 −110.9 −96.5 −92.6\nβ-Sesquiphellandrene −103.9 −92.2 −116.6 −127.5 −99.4 −98.3\nSpathulenol −95.9 −94.8 −97.7 −102.8 −84.3 −102.2\n(Z)-Spiroether −112.8 −85.5 −124.3 −136.1 −101.5 −102.9\nγ-Terpinene −84.3 −74.9 −93.4 −98.7 −82.8 −85.9\n(R)-Terpinen-4-ol −87.3 −66.7 −81.5 −94.0 −80.2 −72.2\n(S)-Terpinen-4-ol −87.1 −67.2 −78.9 −92.3 −80.2 −71.7\n(R)-α-Terpineol −82.0 −68.0 −80.3 −82.2 −77.6 −71.3\n(S)-α-Terpineol −76.9 −75.5 −103.6 −101.7 −86.6 −84.9\nTerpinolene −83.1 −69.8 −89.0 −101.8 −84.8 −72.9\n(-)-α-Thujone −81.4 −66.2 −84.9 −93.4 −72.6 −74.1\n(+)-β-Thujone −87.6 −66.4 −89.9 −102.9 −71.7 −86.9\nThymohydroquinone dimethyl ether −86.3 −75.8 −103.7 −116.0 −85.3 −95.5\nThymol −84.4 −70.8 −96.4 −107.1 −79.7 −91.8\n2-Undecanone −94.5 −90.2 −110.0 −129.7 −91.9 −107.6\nValencene −96.7 −75.1 −103.3 −114.7 −87.8 −76.6\n(+)-Verbenone −74.3 −64.5 −79.3 −71.6 −63.9 −72.3\n(-)-Verbenone −73.5 −63.1 −78.0 −65.3 −64.8 −59.3\nViridiflorene −81.9 −68.6 −102.1 −106.9 −73.1 −81.9\nα-Zingiberene −108.3 −90.9 −113.8 −123.4 −97.7 −99.9 "}

{"project":"LitCovid-PD-UBERON","denotations":[{"id":"T1","span":{"begin":3468,"end":3474},"obj":"Body_part"},{"id":"T2","span":{"begin":7689,"end":7695},"obj":"Body_part"},{"id":"T3","span":{"begin":13774,"end":13782},"obj":"Body_part"},{"id":"T4","span":{"begin":14567,"end":14575},"obj":"Body_part"},{"id":"T5","span":{"begin":14609,"end":14617},"obj":"Body_part"},{"id":"T6","span":{"begin":15946,"end":15954},"obj":"Body_part"},{"id":"T7","span":{"begin":17884,"end":17888},"obj":"Body_part"},{"id":"T8","span":{"begin":17981,"end":17989},"obj":"Body_part"},{"id":"T9","span":{"begin":26652,"end":26658},"obj":"Body_part"},{"id":"T10","span":{"begin":26844,"end":26850},"obj":"Body_part"},{"id":"T11","span":{"begin":26986,"end":26992},"obj":"Body_part"},{"id":"T12","span":{"begin":41273,"end":41279},"obj":"Body_part"},{"id":"T13","span":{"begin":49566,"end":49572},"obj":"Body_part"},{"id":"T14","span":{"begin":49777,"end":49783},"obj":"Body_part"},{"id":"T15","span":{"begin":49986,"end":49992},"obj":"Body_part"},{"id":"T16","span":{"begin":50144,"end":50150},"obj":"Body_part"},{"id":"T17","span":{"begin":50321,"end":50327},"obj":"Body_part"},{"id":"T18","span":{"begin":50498,"end":50504},"obj":"Body_part"},{"id":"T19","span":{"begin":50674,"end":50680},"obj":"Body_part"},{"id":"T20","span":{"begin":51200,"end":51207},"obj":"Body_part"},{"id":"T21","span":{"begin":53474,"end":53480},"obj":"Body_part"}],"attributes":[{"id":"A1","pred":"uberon_id","subj":"T1","obj":"http://purl.obolibrary.org/obo/UBERON_0002370"},{"id":"A2","pred":"uberon_id","subj":"T2","obj":"http://purl.obolibrary.org/obo/UBERON_0002113"},{"id":"A3","pred":"uberon_id","subj":"T3","obj":"http://purl.obolibrary.org/obo/UBERON_1000010"},{"id":"A4","pred":"uberon_id","subj":"T4","obj":"http://purl.obolibrary.org/obo/UBERON_1000010"},{"id":"A5","pred":"uberon_id","subj":"T5","obj":"http://purl.obolibrary.org/obo/UBERON_1000010"},{"id":"A6","pred":"uberon_id","subj":"T6","obj":"http://purl.obolibrary.org/obo/UBERON_1000010"},{"id":"A7","pred":"uberon_id","subj":"T7","obj":"http://purl.obolibrary.org/obo/UBERON_0002398"},{"id":"A8","pred":"uberon_id","subj":"T8","obj":"http://purl.obolibrary.org/obo/UBERON_1000010"},{"id":"A9","pred":"uberon_id","subj":"T9","obj":"http://purl.obolibrary.org/obo/UBERON_0002113"},{"id":"A10","pred":"uberon_id","subj":"T10","obj":"http://purl.obolibrary.org/obo/UBERON_0002113"},{"id":"A11","pred":"uberon_id","subj":"T11","obj":"http://purl.obolibrary.org/obo/UBERON_0002113"},{"id":"A12","pred":"uberon_id","subj":"T12","obj":"http://purl.obolibrary.org/obo/UBERON_0002113"},{"id":"A13","pred":"uberon_id","subj":"T13","obj":"http://purl.obolibrary.org/obo/UBERON_0002370"},{"id":"A14","pred":"uberon_id","subj":"T14","obj":"http://purl.obolibrary.org/obo/UBERON_0002370"},{"id":"A15","pred":"uberon_id","subj":"T15","obj":"http://purl.obolibrary.org/obo/UBERON_0002370"},{"id":"A16","pred":"uberon_id","subj":"T16","obj":"http://purl.obolibrary.org/obo/UBERON_0002370"},{"id":"A17","pred":"uberon_id","subj":"T17","obj":"http://purl.obolibrary.org/obo/UBERON_0002370"},{"id":"A18","pred":"uberon_id","subj":"T18","obj":"http://purl.obolibrary.org/obo/UBERON_0002370"},{"id":"A19","pred":"uberon_id","subj":"T19","obj":"http://purl.obolibrary.org/obo/UBERON_0002370"},{"id":"A20","pred":"uberon_id","subj":"T20","obj":"http://purl.obolibrary.org/obo/UBERON_0003126"},{"id":"A21","pred":"uberon_id","subj":"T21","obj":"http://purl.obolibrary.org/obo/UBERON_0002113"}],"text":"Essential Oils as Antiviral Agents, Potential of Essential Oils to Treat SARS-CoV-2 Infection: An In-Silico Investigation\n\nAbstract\nEssential oils have shown promise as antiviral agents against several pathogenic viruses. In this work we hypothesized that essential oil components may interact with key protein targets of the 2019 severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2). A molecular docking analysis was carried out using 171 essential oil components with SARS-CoV-2 main protease (SARS-CoV-2 Mpro), SARS-CoV-2 endoribonucleoase (SARS-CoV-2 Nsp15/NendoU), SARS-CoV-2 ADP-ribose-1″-phosphatase (SARS-CoV-2 ADRP), SARS-CoV-2 RNA-dependent RNA polymerase (SARS-CoV-2 RdRp), the binding domain of the SARS-CoV-2 spike protein (SARS-CoV-2 rS), and human angiotensin−converting enzyme (hACE2). The compound with the best normalized docking score to SARS-CoV-2 Mpro was the sesquiterpene hydrocarbon (E)-β-farnesene. The best docking ligands for SARS−CoV Nsp15/NendoU were (E,E)-α-farnesene, (E)-β-farnesene, and (E,E)−farnesol. (E,E)−Farnesol showed the most exothermic docking to SARS-CoV-2 ADRP. Unfortunately, the docking energies of (E,E)−α-farnesene, (E)-β-farnesene, and (E,E)−farnesol with SARS-CoV-2 targets were relatively weak compared to docking energies with other proteins and are, therefore, unlikely to interact with the virus targets. However, essential oil components may act synergistically, essential oils may potentiate other antiviral agents, or they may provide some relief of COVID-19 symptoms.\n\n1. Introduction\nThe 2019 severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) is a newly emerging respiratory illness. The epidemic started in December 2019 in Wuhan, China, and has rapidly spread throughout China and the world and is now a global pandemic. SARS-CoV-2 can be efficiently transmitted among humans and has shown a high degree of morbidity and mortality [1,2]. As of April 20, 2020, the worldwide number of infected individuals was 2,544,792, with as many as 175,694 deaths [3]. There are currently no approved vaccines available for the prevention of SARS-CoV-2 infection and only just recently, remdesivir has received “emergency use authorization” for treatment of COVID-19 in the United States; therefore, there is an urgent demand for potential chemotherapeutic agents to treat this disease.\nEssential oils have been screened against several pathogenic viruses (Table 1), including influenza and other respiratory viral infections. Influenza is an infectious respiratory disease caused by one of three types of influenza viruses, type A, type B, or type C [4]. The most significant in terms of human morbidity and mortality is influenza virus type A, which is found in several bird and mammal species [5]. Several different serotypes of influenza type A have caused global flu pandemics [6]: H1N1, which caused the Spanish flu in 1918 (40–50 million deaths worldwide) [7] and the swine flu in 2009 [8]; the Asian flu of 1957–1958 (ca. 1.5 million deaths worldwide) was caused by influenza A H2N2 [8]; serotype H3N2 caused the Hong Kong flu in 1968 [9]; and H5N1, which caused the bird flu in 2004 [10]. Influenza virus type B, however, is largely confined to human hosts [11].\nOne study evaluated the in vitro antiviral effect against influenza type A (H1N1) of commercial essential oils that included cinnamon (Cinnamomum zeylanicum), bergamot (Citrus bergamia), lemongrass (Cymbopogon flexuosus), thyme (Thymus vulgaris), and lavender (Lavandula angustifolia). The oils were tested in the liquid phase at a concentration of 0.3% and in the vapor phase. The oils of cinnamon, bergamot, thyme, and lemongrass displayed 100% inhibition of H1N1 in the liquid phase, while the inhibition for lavender essential oil was 85%. However, in the vapor phase, 100% inhibition was observed only for cinnamon leaf essential oil after 30 min of exposure. The bergamot, lemongrass, thyme, and lavender essential oils displayed inhibition rates of 95%, 90%, 70%, and 80%, respectively [12].\nCinnamomum zeylanicum leaf oil is characterized by eugenol (75–85%), followed by smaller amounts of linalool (1.6–8.5%), and benzyl benzoate (0.1–8.3%) [13,14,15]. Bergamot oil is rich in limonene (23–55%), linalool (2–37%), and linalyl acetate (12–41%), with lesser quantities of β-pinene (up to 10%) and γ-terpinene (up to 10%) [16,17,18,19,20]. Geranial (48–54%) and neral (29–33%) have been reported as the major components of C. flexuosus, but many chemotypes, cultivars, and variants have been reported for C. flexuosus [21,22].\nIn the literature, there have been at least 20 different chemotypes identified for thyme essential oil. The “typical” thyme essential oil presents a thymol content of 45% (range 31–50%), with significant concentrations of p-cymene (0.1–26.6%, average = 15.6%) and γ-terpinene (up to 22.8%, average = 9.3%). In addition, there are several other chemotypes of T. vulgaris rich in thymol and/or carvacrol [23]. Thymol has been identified as an anti-influenza agent against influenza type A and parainfluenza type 3 virus [24,25]. Lavandula angustifolia essential oil is rich in linalyl acetate (37.0–43.6%), linalool (19.7–39.1%), geraniol (up to 9.3%), β-caryophyllene (up to 5.1%), terpinen-4-ol (up to 14.9%), lavandulyl acetate (up to 5.5%), and borneol (up to 6.4%) [26,27,28,29].\nAnother essential oil with notable anti-influenza effects is tea tree, which is extracted from the leaves of Melaleuca alternifolia (Myrtaceae). Commercial tea tree oil is composed of terpinen-4-ol (30–48%), γ-terpinene (10–28%), α-terpinene (5–13%), 1,8-cineole (up to 15%), terpinolene (1.5–5%), p-cymene (0.5–12%), α-pinene (1–6%), and α-terpineol (1.5–8%) [30]. Tea tree oil showed 100% inhibition of influenza type A (H1N1) virus at 0.01% concentration and a median inhibitory concentration (IC50) of 6 μg/mL [31,32]. In addition, 30 min exposure of type A (H11N9) virus to tea tree oil vapor caused 100% inhibition [33]. The tea tree oil components, terpinen-4-ol, terpinolene, and α-terpineol, have shown anti-influenza virus activity against type A (H1N1), with IC50 values of 25, 12, and 250 μg/mL, respectively. α-Terpinene, γ-terpinene, and p-cymene were inactive, however [31].\nAvian influenza viruses (H5N1) exhibit both high and low virulence in numerous mammalian species, highlighting the connection between the route of inoculation and virus pathogenicity [34]. Since 2003, there have been over 600 documented cases of human infection with H5N1 viruses, with most cases among young, previously healthy individuals [35]. The essential oils extracted from Citrus reshni leaves and peel (unripe and ripe fruits) were tested against H5N1 virus by plaque reduction assay. The oils showed moderate inhibition of the H5N1 virus at a concentration of 2.5 μL/mL. Sabinene (40.5%), linalool (23.3%), and terpinen-4-ol (8.3%) were the main constituents in the leaf oil while limonene (82.4%, 91.6%) was the main compound in the fruit peel essential oils (unripe and ripe, respectively) [36].\nThe essential oil of leaves of Fortunella margarita is rich in the sesquiterpenoids β-eudesmol (28.3%), α-muurolene (10.3%), β-gurjunene (10.0%), γ-eudesmol (8.4%), and γ-muurolene (6.6%) while the essential oil extracted from the fruits showed monterpenoids as the main components, α-terpineol (55.5%), carvone (5.7%), and carveol (5.5%). Both samples were tested for antiviral activity against avian influenza (H5N1) virus, and the obtained results revealed that the fruit essential oil was more effective (80% virus inhibition by the MTT (3-(4,5-dimethylthiazol-2-yl)-2,5-diphenyltetrazolium bromide) assay using Madin−Darby canine kidney (MDCK) cells for virus propagation). The IC50 values obtained for the leaf and fruit essential oils were 38.89 and 6.77 μg/mL, respectively [53].\nDengue fever, a mosquito−borne disease, is caused by dengue virus (DENV) which includes four major serotypes (DENV-1, -2, -3, and -4). Some serotypes cause more severe diseases than others; severe dengue is associated with secondary infections by a different serotype. Dengue disease is a major public health problem in developing tropical countries and has being continuously spreading to new geographical areas [92]. The essential oils of two species of Lippia were assayed against four dengue serotypes (DENV-1, DENV-2, DENV-3, DENV-4) [61]. The IC50 values for Lippia alba oil, rich in carvone (39.7%), limonene (30.6%), and bicyclosesquiphellandrene (8.9%), were between 0.4 and 32.6 μg/mL. However, the Lippia citrodora essential oil, composed of geranial (18.9%), neral (15.6%), limonene (10.7%), and 1,8-cineole (5.0%), showed the best activity, with IC50 values varying from 1.9 to 33.7 μg/mL. No viral inhibitory effect was observed by addition of the essential oil after virus adsorption; the inhibitory effect of the essential oil seemed to cause direct virus inactivation before adsorption on the host cell.\nThe essential oils of seven aromatic plants from Córdoba, San Luis, and San Juan provinces (Argentina) were screened for cytotoxicity and in vitro inhibitory activity against dengue virus type 2 (DENV−2) [38]. The oils of Jungia polita and Buddleja cordobensis were composed of caryophyllene oxide (9.18%, 32.1%) and β-caryophyllene (8.13%, 16.5%) as the major compounds. However, these oils displayed different IC50 values (86.4 and 39.8 μg/mL, respectively). The other samples were composed mostly of monoterpenes and displayed lower activity, except Pectis odorata oil, which presented limonene (50.2%), neral (27.2%), and geranial (23.6%) as the major compounds and an IC50 value of 39.6 μg/mL. In addition, the essential oils of Artemisia mendozana, rich in camphor (22.4%), artemisole (11.7%), and artemisia alcohol (10.8%); Gailardia megapotamica composed of β-pinene (35.5%), spathulenol (10.7%), and germacrene D (6.8%); and Heterothalamus alienus characterized by β-pinene (35.5%), spathulenol (10.7%), and germacrene D (6.8%), showed an average IC50 value of 130.63 μg/mL.\nYellow fever (YF), caused by yellow fever virus (YFV), has historically been considered one of the most dangerous infectious diseases. YFV is transmitted to humans via mosquitoes of the Haemogogus, Sabethes, and Aedes genera. Annually, there are approximately 80,000–200,000 YFV cases worldwide, with a case fatality rate (CFR) ranging from 20–60% [93,94]. Essential oils of Lippia species and their main compounds have been tested against yellow fever virus (YFV) in Vero cells. The oil of Lippia origanoides showed carvacrol (44.0%), thymol (15.0%), and γ-terpinene (10.0%) as the main compounds and displayed 100% inhibition at a concentration of 11.1 μg/mL [43]. However, in the same study, the oil of L. alba displayed 100% inhibition at a concentration of 100.0 μg/mL. The major compounds were carvone (51.0%), limonene (33.0%), and bicyclosesquiphellandrene (7.0%). The essential oil of L. alba with a similar chemical composition, carvone (39.7%), limonene (30.6%), and bicyclosesquiphellandrene (8.9%), displayed an IC50 value of 4.3 μg/mL against YFV when tested in Vero cells using the MTT assay [62]. The essential oil of L. citriodora, dominated by geranial (18.9%), neral (15.6%), and limonene (10.7%), did not display a statistical difference in comparison to citral, with IC50 values of 19.4 and 17.6 μg/mL, respectively [62].\nIn addition to essential oils, several individual essential oil components have been screened for antiviral activity (Table 2).\nBecause of the activities of several essential oils and essential oil components against human pathogenic viruses, we hypothesized that essential oil components may be potentially useful as antiviral agents against SARS-CoV-2. In this work, we carried out a molecular docking analysis of the major components of essential oils that exhibit antiviral activity (Table 1 and Table 2) with known SARS-CoV-2 protein targets.\n\n2. Results and Discussion\nSeveral proteins have been identified for severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2), which may serve as potential targets for chemotherapeutic intervention in coronavirus disease 2019 (COVID-19). These protein targets include SARS-CoV-2 main protease (SARS-CoV-2 Mpro), SARS-CoV-2 endoribonucleoase (SARS-CoV-2 Nsp15/NendoU), SARS-CoV-2 ADP−ribose−1″−phosphatase (SARS-CoV-2 ADRP), SARS-CoV-2 RNA-dependent RNA polymerase (SARS-CoV-2 RdRp), the binding domain of the SARS-CoV-2 spike protein (SARS-CoV-2 rS), and human angiotensin−converting enzyme (hACE2). There have already been several molecular docking studies on these macromolecular targets. Several groups have carried out molecular docking of natural product libraries with SARS-CoV-2 Mpro [102,103,104,105]. Additionally, commercially available drugs have also been examined using in silico methods [106,107].\nA molecular docking study was carried out with 171 essential oil components with SARS-CoV-2 Mpro (PDB: 5R7Z, 5R80, 5R81, 5R82, 5R83, 5R84, 6LU7, 6M03, and 6Y84), SARS-CoV-2 Nsp15/NendoU (PDB: 6VWW, 6W01, and 6W02), SARS-CoV-2 rS (PDB: 6M0J, 6M17, 6VX1, and 6VW1), and SARS-CoV-2 RdRp (PDB: 6M71). The best docking scores are summarized in Table 3.\nThe main protease, SARS-CoV-2 Mpro, is a cysteine protease that is essential for processing the polyproteins that are translated from the coronavirus RNA [108]. The substrate binding site of the enzyme is a cleft flanked by Gln189, Met49, Pro168, Glu166 and His41; the active site is Cys145 and His41. The compound with the best normalized docking score to SARS-CoV-2 Mpro was the sesquiterpene hydrocarbon (E)-β-farnesene (DSnorm = −115.4 kJ/mol). Other essential oil components showing good docking scores with SARS-CoV-2 Mpro were (E,E)-α-farnesene (DSnorm = −115.0 kJ/mol), (E,E)-farnesol (DSnorm = −112.4 kJ/mol), and (E)-nerolidol (DSnorm = −110.7 kJ/mol). The sesquiterpene hydrocarbons (E,E)-α-farnesene and (E)-β-farnesene occupy the substrate binding site, flanked by Gln189, Arg188, Met165, His41, and Asp 187 (Figure 1). The lowest-energy docked poses of both (E,E)-farnesol and (E)-nerolidol showed hydrogen bonding of the alcohol moiety to Gln192 and Thr190 and, in the case of (E)-nerolidol, also with GLN189 and ARG188 (Figure 2).\nNon-structural protein 15 (Nsp15) of SARS-CoV-2 is an endoribonuclease that preferentially cleaves RNA at uridylate. Furthermore, it has been shown that SARS-CoV Nsp15/NendoU is required for successful viral infection [109]. The best docking ligands for SARS-CoV Nsp15/NendoU are (E,E)-α-farnesene (DSnorm = −107.5 kJ/mol), (E)-β-farnesene (DSnorm = −105.0 kJ/mol), (E,E)-farnesol (DSnorm = −104.6 kJ/mol), and (E)-nerolidol (DSnorm = −101.6 kJ/mol). All of these sesquiterpenoids preferentially docked into a binding site formed by amino acid residues Gln347, Ile328, Val276, Ser274, Thr275, Ser329, Asn74, Asn75, Glu327, and Lys71 (Figure 3). In addition to van der Waals interactions, (E,E)-farnesol showed hydrogen-bonding interactions with Ser329 and Glu327, while (E)-nerolidol hydrogen bonded with Asn75 and Lys71 (Figure 3). Unfortunately, the docking scores for these ligands as well as the scores of the other essential oil components with this protein are too low for it to be considered a viable target (see Table 3).\nADP ribose phosphatase (ADRP) serves to convert ADP-ribose 1″-monophosphate (Appr-1″-p) to ADP-ribose (Appr), which serves to regulate virus replication [110]. This enzyme may be dispensable in SARS-CoV-2, however [111]. Nevertheless, (E,E)-farnesol showed the most exothermic docking to SARS-CoV-2 ADRP with DSnorm = −121.4 kJ/mol. The binding site in SARS-CoV-2 ADRP is surrounded by Phe132, Asn40, Ile131, Ala38, and Ala39, with hydrogen-bonded interactions between the ligand alcohol and Asn40 (Figure 4). Additional essential oil components with good docking scores with SARS-CoV-2 ADRP include the sesquiterpene hydrocarbons (E)-β-farnesene (DSnorm = −116.3 kJ/mol), (E,E)-α-farnesene (DSnorm = −114.2 kJ/mol), β-sesquiphellandrene (DSnorm = −115.7 kJ/mol), and α-zingiberene (DSnorm = −115.4 kJ/mol); the diterpenoids phytol (DSnorm = −118.9 kJ/mol) and phytone (DSnorm = −116.9 kJ/mol); and the phenylpropanoid eugenyl acetate (DSnorm = −115.4 kJ/mol). Not surprisingly, β-sesquiphellandrene and α-zingiberene adopted the same docking orientation in the binding site of the enzyme (Figure 5A). Similarly, phytol and phytone occupy the same location in the binding site (Figure 5B).\nRNA-dependent RNA polymerase catalyzes RNA replication from an RNA template and is an essential enzyme in RNA viruses. Because these enzymes are crucial in viral replication, they are viable targets in antiviral chemotherapy [112]. Molecular docking of essential oil components with SARS-CoV-2 RdRp showed only weak docking with this enzyme target (Table 3). The ligand with the best docking score was (E,E)-farnesol, with DSnorm = −89.6 kJ/mol.\nThe SARS-CoV-2 spike protein serves to attach to angiotensin-converting enzyme 2 (ACE2) of the human cell to be invaded. The interface between SARS-CoV-2 rS and human ACE2 would be a promising target to prevent binding of SARS-CoV-2 rS to human ACE2 [113,114]. The best docking ligands with human ACE2, i.e., normalized docking scores \u003c -100 kJ/mol (α-bulnesene, eremanthin, (E,E)-α-farnesene, (E)-β-farnesene, (E,E)-farnesol, (E)-nerolidol, β-sesquiphellandrene, and (Z)-spiroether), all show docking preference to a cavity removed from the interaction interface between the SARS-CoV-2 spike protein and ACE2 (Figure 6). This cavity is a pocket surrounded by residues Pro565, Leu95, Val209, Asn210, Leu91, Lys94, Glu208, and Glu564. Because of the remote location of docking with ACE2, it is predicted that interaction of essential oil components with ACE2 will not prevent protein–protein interaction between the SARS-CoV-2 spike protein and human ACE2.\nOn the other hand, the lowest energy poses of essential oil components showing the strongest docking (\u003c−80 kJ/mol; (E)-cinnamyl acetate, eremanthin, (E,E)-α-farnesene, (E)-β-farnesene, (E,E)-farnesol, and geranyl formate) with the binding domain of the SARS-CoV-2 spike protein do lie at the interface between the SARS-CoV-2 spike protein and human ACE2 (Figure 6). This docking site is a hydrophobic pocket formed by Tyr505, Tyr495, Asn501, Arg403, Tyr453, and Gly502. Unfortunately, the docking energies at this site are too weak and are unlikely, therefore, to disrupt binding between SARS-CoV-2 rS and human ACE2.\nIn order to compare docking scores of the essential oil components with other proteins, docking was also carried out with six randomly selected non-virus proteins: Bovine odorant binding protein (BtOBP, PDB: 1GT3), cruzain (PDB: 1ME3), torpedo acetylcholinesterase (TcAChE, PDB: 6G1U), Bacillus anthracis nicotinate mononucleotide adenylytransferase (BaNadD, PDB: 3HFJ), Russell’s viper phospholipase A2 (DrPLA2, PDB: 1FV0), and Escherichia coli l-aspartate aminotransferase (EcAspTA, PDB: 2Q7W). Docking scores for these proteins are summarized in Table 4.\nThe docking results of the essential oil components with the six randomly selected proteins indicate the best docking ligands to SARS-CoV-2 targets (i.e., (E,E)-α-farnesene, (E)-β-farnesene, and (E,E)-farnesol) have better docking energies with other proteins. These three sesquiterpenes have docking energies of −129.8, −122.7, and −133.0 kJ/mol with TcAChE, respectively, and −131.8, −131.8, and −135.6 kJ/mol, respectively, with BaNadD. Indeed, most of the essential oil ligands have better docking properties with one or more of the random proteins compared to the SARS-CoV-2 proteins.\nBased on the docking energies of essential oil components with key protein targets of SARS-CoV-2, the individual essential oil components cannot be considered viable chemotherapeutic agents for interaction with the SARS-CoV-2 target proteins. However, essential oils are complex mixtures of compounds and several essential oil components may act synergistically to inhibit the virus. Astani and co-workers have shown, for example, that the antiviral activity (HSV-1) of Eucalyptus oil is much greater than the major component 1,8-cineole, and that tea tree oil has a greater antiviral activity than its components terpinen-4-ol, γ-terpinene, and α-terpinene [52].\nSynergistic effects have also been observed between essential oils and synthetic antiviral agents. Civitelli and co-workers observed an antiviral synergism between Mentha suaveolens essential oil and acyclovir on HSV-1 [64]. Likewise, Melissa officinalis essential oil potentiated the activity of oseltamivir against avian influenza virus H9N2 [115]. Furthermore, essential oils are lipophilic and therefore may also serve to disintegrate viral membranes [116].\nOutside of antiviral activity, there may be some relief of symptoms of COVID-19 provided by essential oils. For example, linalool [117,118], β-caryophyllene [119,120], and 1,8-cineole [121,122] have both anti-inflammatory and antinociceptive activity; menthol [123,124], camphor [125,126], and thymol [127] have antitussive activities.\n\n3. Materials and Methods\n\n3.1. Bibliographic Search Criteria\nThe bibliographic research was performed using the databases Google Scholar, Pubmed, Science Direct, Medline, and Scopus. The keywords applied were “antiviral activity” and “essential oils”, “antiviral activity” and “volatile compounds”, and “essential oils” and “respiratory diseases”.\n\n3.2. Ligand Selection\nThe major components (\u003e5%) of essential oils and pure essential oil components that have been screened against human pathogenic viruses were selected. In the case where enantiomers are known to be natural products, both structures were selected. A total of 171 essential oil components were used in the virtual screening.\n\n3.3. Molecular Docking\nEach ligand structure was prepared using Spartan ’18 v. 1.4.4 (Wavefunction, Inc., Irvine, CA, USA). The lowest-energy conformations of the ligands were determined and used as starting structures in the molecular docking. This is particularly important to include all potential conformations in medium-sized rings where interconversion between conformations may be hindered (e.g., bicyclogermacrene, costunolide, curdione, germacrene D, germacrone, and α-humulene). A total of six protein targets of SARS-CoV-2 from the Protein Data Bank (PDB), represented by a total of 17 structures, were used in the molecular docking, including SARS-CoV-2 main protease (PDB: 5R7Z, 5R80, 5R81, 5R82, 5R83, 5R84, 6LU7, 6M03, and 6Y84), SARS-CoV-2 endoribonuclease (PDB: 6VWW), SARS-CoV-2 ADP ribose phosphatase (PDB: 6W01 and 6W02), SARS-CoV-2 RNA-dependent RNA polymerase (PDB: 6M71), SARS-CoV-2 spike protein binding domain (PDB: 6M0J, 6VX1, 6VW1, and 6M17), and the human angiotensin-converting enzyme (PDB: 6M0J, 6VX1, 6VW1, and 6M17). Molecular docking was carried out using Molegro Virtual Docker v. 6.0.1 (Aarhus, Denmark) as previously reported [128,129]. Briefly, a 15-Å radius sphere centered on the binding sites of each protein structure in order to permit each ligand to search. In the case of the spike protein and human ACE2, the docking sphere was located at the interface between the spike protein and ACE2. In one case, ACE2 was removed and docking was carried out with the spike protein, and in the other case, the spike protein was removed and docking was carried out with ACE2. Standard protonation states of each protein, based on neutral pH, were used, and charges were assigned based on standard templates as part of the Molegro Virtual Docker program. Each protein was used as a rigid model without protein relaxation. Flexible-ligand models were used in the docking optimizations. Different orientations of the ligands were searched and ranked based on their “rerank” energy scores. A minimum of 100 runs for each ligand was carried out. In analyzing the docking scores, we accounted for the recognized bias due to molecular weight [130,131,132] using the scheme: DSnorm = 7.2 × Edock/MW⅓, where DSnorm is the normalized docking score, Edock is the MolDock re-rank score, MW is the molecular weight, and 7.2 is a scaling constant to ensure the average DSnorm values are comparable to those of Edock [128]. The best docking results are summarized in Table 1.\n\n4. Conclusions\nA molecular docking analysis was carried out using 171 essential oil components with the SARS-CoV-2 main protease (SARS-CoV-2 Mpro), SARS-CoV-2 endoribonucleoase (SARS-CoV-2 Nsp15/NendoU), SARS-CoV-2 ADP-ribose-1″-phosphatase (SARS-CoV-2 ADRP), SARS-CoV-2 RNA-dependent RNA polymerase (SARS-CoV-2 RdRp), the binding domain of the SARS-CoV-2 spike protein (SARS-CoV-2 rS), and human angiotensin-converting enzyme (hACE2). The best docking ligands for the SARS-CoV target proteins were (E,E)-α-farnesene, (E)-β-farnesene, and (E,E)-farnesol. The docking energies were relatively weak, however, and are unlikely to interact with the virus targets. However, essential oil components may act synergistically, essential oils may potentiate other antiviral agents, or they may provide some relief of COVID-19 symptoms.\n\nAcknowledgments\nW.N.S. participated in this work as part of the activities of the Aromatic Plant Research Center 237 (APRC, https://aromaticplant.org/).\n\nAuthor Contributions\nConceptualization, J.K.R.d.S., K.G.B., and W.N.S.; methodology, J.K.R.d.S., K.G.B., and W.N.S.; formal analysis, W.N.S.; investigation, J.K.R.d.S., P.L.B.F., K.G.B., and W.N.S.; data curation, W.N.S.; writing—original draft preparation, J.K.R.d.S. and W.N.S.; writing—review and editing, J.K.R.d.S., P.L.B.F., K.G.B., and W.N.S.; project administration, W.N.S.; All authors have read and agreed to the published version of the manuscript.\n\nFunding\nThis research received no external funding.\n\nConflicts of Interest\nThe authors declare no conflict of interest. Abbreviations\nAdeno Adenovirus\nAIV Avian influenza virus\nBaNadD Bacillus anthracis nicotinate mononucleotide adenylytransferase\nBtOBP Bovine odorant binding protein\nCOVID-19 Coronavirus disease 2019\nCox B1 Coxsackie B1 virus\nDENV-1 Dengue virus serotype 1\nDENV-2 Dengue virus serotype 2\nDENV-3 Dengue virus serotype 3\nDENV-4 Dengue virus serotype 4\nDrPLA2 Russell’s viper phospholipase A2\nDSnorm Normalized docking score\nEcAspTA Esherichia coli L-aspartate aminotransferase\nECHO 9 Echovirus 9\nhACE2 Human angiotensin-converting enzyme\nHeLa Human cervical tumor cells\nHEp-2 Human epithelial type 2 cells\nHRSV Human respiratory syncytial virus\nHSV-1 Herpes simplex virus 1\nHSV-2 Herpes simplex virus 2\nIC50 Median inhibitory concentration\nJUNV Junin virus\nMDCK Madin-Darby canine kidney cells\nMTT 3-(4,5-dimethylthiazol-2-yl)-2,5-diphenyltetrazolium bromide\nPCR Polymerase chain reaction\nPDB Protein data bank\nPolio 1 Poliomyelitis virus 1\nRC-37 African green monkey kidney cells\nSARS-CoV-2 2019 severe acute respiratory syndrome coronavirus 2\nTcAChE Torpedo acetylcholinesterase\nVero African green monkey kidney cells\nYFV Yellow fever virus\n\nFigure 1 Lowest-energy docked poses of (E)-β-farnesene and (E,E)-α-farnesene with the SARS-CoV-2 main protease (PDB: 6LU7). (A) Ribbon structure of the enzyme and (E)-β-farnesene. (B) Solid structure of the enzyme showing (E)-β-farnesene in the binding cleft. (C) Amino acid residues in proximity to the docked (E)-β-farnesene. (D) Lowest-energy docked pose of (E,E)-α-farnesene in the enzyme binding site.\nFigure 2 Lowest-energy docked poses of (E,E)-farnesol and (E)-nerolidol with the SARS-CoV-2 main protease (PDB: 6Y84). (A) Ribbon structure of the enzyme and (E,E)-farnesol (magenta) and (E)-nerolidol (orange). (B) Solid structure of the enzyme showing (E,E)-farnesol (magenta) and (E)-nerolidol (orange) in the binding cleft. (C) Important interactions of amino acid residues with (E,E)-farnesol. (D) Important interactions of amino acid residues with (E)-nerolidol. Hydrogen bonds are indicated with blue dashed lines.\nFigure 3 Lowest-energy docked poses of (E,E)-α-farnesene, (E)-β-farnesene, (E,E)-farnesol, and (E)-nerolidol with SARS-CoV-2 endoribonuclease (PDB: 6VWW). (A) Ribbon structure of the enzyme and (E,E)-α-farnesene (green), (E)-β-farnesene (aqua), (E,E)-farnesol (magenta), and (E)-nerolidol (orange). (B) Solid structure of the enzyme showing (E,E)-α-farnesene (green), (E)-β-farnesene (aqua), (E,E)-farnesol (magenta), and (E)-nerolidol (orange) in the binding cleft. (C) Lowest-energy docked pose of (E,E)-α-farnesene in the binding site. (D) Lowest-energy docked pose of (E)-β-farnesene in the binding site. (E) Lowest-energy docked pose of (E,E)-farnesol in the binding site. (F) Lowest-energy docked pose of (E)-nerolidol in the binding site. Hydrogen bonds are indicated with blue dashed lines.\nFigure 4 Lowest-energy docked pose of (E,E)-farnesol with SARS-CoV-2 ADP ribose phosphatase (PDB: 6W02). (A) Ribbon structure of the enzyme and the docked ligand. (B) Solid structure of the enzyme showing (E,E)-farnesol in the binding cleft. (C) Amino acid residues in proximity to the docked (E,E)-farnesol (hydrogen bonds are indicated with blue dashed lines).\nFigure 5 Lowest-energy docked poses of β-sesquiphellandrene, α-zingiberene, phytol, and phytone with SARS-CoV-2 ADP ribose phosphatase (PDB: 6W02). (A) Ribbon structure of the enzyme with β-sesquiphellandrene (brown) and α-zingiberene (yellow). (B) Ribbon structure of the enzyme with phytol (green) and phytone (red).\nFigure 6 Lowest-energy docked ligands with the binding domain of SARS-CoV-2 spike protein and human angiotensin-converting enzyme 2 (ACE2) (PDB: 6M17).\nTable 1 Essential oils showing antiviral activity.\nEssential Oil Major Components Assay IC50 (μg/mL) Reference\nAloysia gratissima (Gillies \u0026 Hook.) Tronc. caryophyllene oxide (15.8%), guaiol (17.4%) a, chrysanthenyl acetate (5.6%), and limonene oxide (5.3%) Plaque reduction assay (Vero cells), HSV-1 65.0 [37]\nAloysia triphylla Royle α-thujone (22.9%), cis−carveol (17.5%), carvone (13.2%), and limonene (12.7%) Plaque reduction assay (Vero cells), HSV-1 \u003e250 [38]\nArtemisia arborescens L. camphor (35.7%), β-thujone (24.0%), and chamazulene (7.7%) Plaque reduction assay (Vero cells), HSV-1 25% inhibition at 100 μg/mL [39]\nArtemisia arborescens L. Artemisia arborescens L. β-thujone (45.0%), camphor (6.8%), and chamazulene (22.7%) c Plaque reduction assay (Vero cells), HSV-1, HSV-2 2.4, 4.1 [40]\nArtemisia douglasiana Besser α-thujone (68.3%) and β-thujone (7.5%) Plaque reduction assay (Vero cells), HSV-1 83 [37]\nArtemisia kermanensis Podlech (syn. Seriphidium kermanense (Podlech) K. Bremer \u0026 Humphries α-thujone (13.8%), camphor (10.2%), and β-thujone (6.2%) Plaque reduction assay (Vero cells), HSV-1 40 [41]\nArtemisia mendozana DC. camphor (22.4%), artemiseole (11.7%), artemisia alcohol (10.8%), and borneol (7.2%) Plaque reduction assay, DENV−2, JUNV and HSV-1 129.3, 178.6, and 153.7 [38]\nArtemisia princeps Pamp. borneol (12.1%), α-thujone (8.7%), τ−cadinol, (6.7%), and 1,8-cineole (6.2%) Plaque reduction assay, murine norovirus−1 64% inhibition at 0.01% [42]\nPlaque reduction assay, feline calicivirus−F9 48% inhibition at 0.1%\nArtemisia vulgaris L. α-thujone (38.1%), β-thujone (10.6%), and 1,8-cineole (8.8%) Virus yield assay (Vero cells), yellow fever virus (YFV) 100 μg/mL (100% inhibition) [43]\nAyapana triplinervis (Vahl) R.M. King \u0026 H. Rob. thymohydroquinone dimethyl ether Plaque reduction assay (A549 cells), Zika virus 38.0 [44]\nBuddleja cordobensis Griseb. caryophyllene oxide (32.1%), β-caryophyllene (16.5%), and α-copaene (8.5%) Plaque reduction assay, DENV−2, JUNV and HSV-1 86.4, 39.0, and 54.1 [38]\nCedrus libani A. Rich. himachalol (22.5%), β-himachalene (21.9%), and α-himachalene (10.5%) Cytopathic effect (CPE) on Vero cells, HSV-1 440 [45]\nCinnamomum zeylanicum Blume (syn. Cinnamomum verum J. Presl) eugenol (75–85%), linalool (1.6−8.5%), (E)−cinnamaldehyde (0.6−1.5%), (E)−cinnamyl acetate (0.7–2.6%), β-caryophyllene (0.5–6.7%), eugenyl acetate (0.1–2.9%), and benzyl benzoate (0.1–8.3%) Influenza type A (H1N1) [46]\nCinnamomum zeylanicum Blume (syn. Cinnamomum verum J. Presl) (E)−cinnamaldehyde (63.9%), eugenol (7.0%), and (E)−cinnamyl acetate (5.1%) c Plaque reduction assay (HeLa cells), HSV-2 82 [47]\nCitrus × bergamia Risso \u0026 Poit. limonene (23–55%), linalool (2–37%), linalyl acetate (12–41%), β-pinene (up to 10%), and γ-terpinene (up to 10%) Influenza virus type A H1N1 100% inhibition at 0.3% [46]\nCitrus limonum Risso limonene (54.6%), γ-terpinene (19.1%), and β-pinene (14.5%) d Plaque reduction assay (Vero cells), HSV-1 2500 [48]\nCitrus reshni Hort ex Tan. (leaf EO) sabinene (40.5%), linalool (23.3%), and terpinen-4-ol (8.3%) Plaque reduction assay, influenza A virus H5N1 19.4% inhibition at 0.1 μL/mL [36]\nCitrus reshni Hort ex Tan. (unripe fruit peel EO) limonene (82.4%) and linalool (7.2%) Plaque reduction assay, influenza A virus H5N1 61.5% inhibition at 1.5 μL/mL [36]\nCitrus reshni Hort ex Tan. (ripe fruit peel EO) limonene (91.6%) Plaque reduction assay, influenza A virus H5N1 50% inhibition at 1.5 μL/mL [36]\nCupressus sempervirens L. α-pinene (51.9%) and δ-3-carene (24.9%) c Plaque reduction assay (Vero cells), HSV-1 6600 [48]\nCymbopogon citratus (DC.) Stapf geranial (40.2%), neral (30.6%), and geraniol (6.7%) c Plaque reduction assay (Vero cells), HSV-1 91 [48]\nCymbopogon flexuosus (Nees) Will. Watson geranial (48–54%) and neral (29–33%) Influenza virus type A (H1N1) [46]\nCynanchum stauntonii (Decne.) Schltr. ex H. Lév. (2E,4E)-decadienal (23.0%), γ-nonalactone (4.2%), 5-pentyl-2(3H)−furanone (3.8%), and 3-isopropyl-1-pentanol (3.5%) Influenza type A (H1N1) 64 [46]\nDysphania ambrosioides (L.) Mosyakin \u0026 Clemants cis-ascaridole (60.7%) and m-cymene (22.2%) Plaque reduction assay, Coxsackie virus B4 21.75 [49]\nEucalyptus astringens (Maiden) Maiden 1,8-cineole (42.0%), α-pinene (22.0%), and trans−pinocarveol (7.0%) Vero cells, Coxsakie virus B3 13.0 [50]\nEucalyptus bicostata Maiden, Blakely \u0026 Simmonds 1,8-cineole (68.0%), globulol (5.4%), and trans−pinocarveol (4.6%) Vero cells, Coxsakie virus B3 13.6 [50]\nEucalyptus caesia Benth. 1,8-cineole (40.2%), p-cymene (14.1%), γ-terpinene (12.4%), α-pinene (7.7%), and terpinen-4-ol (5.6%) Plaque reduction assay (Vero cells), HSV-1 70 [41]\nEucalyptus camaldulensis Dehnh. α-terpinene (26.3%), α-terpineol (9.1%), and camphene (8.5%) e Plaque reduction assay, Rotavirus Wa strain 50% inhibition at 10% EO concentration [51]\nEucalyptus camaldulensis Dehnh. α-terpinene (26.3%), α-terpineol (9.1%), and camphene (8.5%) e Plaque reduction assay, Coxsackie virus B4 53.3% at 10% EO concentration [51]\nEucalyptus camaldulensis Dehnh. α-terpinene (26.3%), α-terpineol (9.1%), and camphene (8.5%) e Plaque reduction assay, HSV-1 90% at 10% EO concentration [51]\nEucalyptus camaldulensis Dehnh. α-terpinene (26.3%), α-terpineol (9.1%), and camphene (8.5%) e Plaque reduction assay, adenovirus type 7 0% at 10% EO concentration [51]\nEucalyptus cinereal F. Muell. ex Benth. 1,8-cineole (70.4%), α-pinene (4.5%), and limonene (3.7%) Vero cells, Coxsakie virus B3 13.0 [50]\nEucalyptus globulus Labill. 1,8-cineole (63.8%) and α-pinene (14.0%) f Plaque reduction assay (Vero cells), HSV-1 1700 [48]\nEucalyptus globulus Labill. 1,8-cineole (63.8%) and α-pinene (14.0%) f Plaque reduction assay (RC-37 cells), HSV-1 55.0 [52]\nEucalyptus lehmannii (Schauer) Benth. 1,8-cineole (59.6%), α-pinene (17.6%), and α-terpineol (8.7%) Vero cells, Coxsakie virus B3 11.5 [50]\nEucalyptus leucoxylon F. Muell. 1,8-cineole (59.2%), α-pinene (7.8%), and α-terpineol (4.3%) Vero cells, Coxsakie virus B3 8.1 [50]\nEucalyptus maidenii F. Muell. 1,8-cineole (57.8%), p-cymene (7.4%), and α-pinene (7.3%) Vero cells, Coxsakie virus B3 14.5 [50]\nEucalyptus odorata Behr cryptone (20.9%), p-cymene (16.7%), phellandral (6.6%), and cuminal (6.6%) Vero cells, Coxsakie virus B3 19.2 [50]\nEucalyptus sideroxylon A. Cunn. ex Woolls 1,8-cineole (69.2%), α-pinene (6.9%), and α-terpineol (5.4%) Vero cells, Coxsakie virus B3 12.3 [50]\nEupatorium patens D. Don ex Hook. \u0026 Arn. germacrene D (36.2%), β-caryophyllene (14.1%), and bicyclogermacrene (7.0%) Plaque reduction assay (Vero cells), HSV-1 125 [37]\nFortunella margarita (Lour.) Swingle (leaf EO) α-terpineol (55.5%), carvone (5.7%), carveol (5.5%), γ-muurolene (5.5%), and citronellal (5.0%) MTT assay, reasserted avian influenza A virus, H5N1 6.77 [53]\nFortunella margarita (Lour.) Swingle (fruit EO) β-eudesmol (28.3%), α-muurolene (10.3%), β-gurjunene (10.0%), γ-eudesmol (8.4%), and γ-muurolene (6.6%) MTT assay, reasserted avian influenza A virus, H5N1 38.89 [53]\nGaillardia megapotamica (Spreng.) Baker β-pinene (24.2%), (Z)-β-ocimene (16.5%), α-pinene (7.7%), limonene (7.5%), and β-caryophyllene (6.7%) Plaque reduction assay, DENV−2, JUNV and HSV-1 140.6, 49.8, and 99.1 [38]\nHeterothalamus alienus (Spreng.) Kuntze β-pinene (35.5%), spathulenol (10.7%), and germacrene D (6.8%) Plaque reduction assay DENV−2, JUNV and HSV-1 122.3, 44.2 and 148.4 [38]\nHeterotheca latifolia Buckley borneol (40.0%), camphor (24.3%), and limonene (5.1%) Plaque reduction assay (Vero cells), HSV-1 \u003e150 [37]\nHouttuynia cordata Thunb. decanal (3.4−8.9%), decanol (up to 7.0%), 2−undecanone (23.0−36.1%), decanoic acid (1.4−6.3%), dodecanal (up to 7.3%), and 2−tridecanone (2.6−5.6%) Influenza type A (H1N1) 48 [54]\nHyptis mutabilis (Rich.) Briq. fenchone (17.1%), 1,8-cineole (12.6%), β-caryophyllene (10.9%), bicyclogermacrene (8.7%), and germacrene D (6.2%) Plaque reduction assay (Vero cells), HSV-2 (Human Herpesvirus type 1) 79.01 [55]\nHyptis mutabilis (Rich.) Briq. germacrene D (15.1%), β-caryophyllene (13.3%), curzerene (13.3%), and bicyclogermacrene (13.2%) Plaque reduction assay (Vero cells) \u003e150 [37]\nHyssopus officinalis L. cis−pinocamphone (40.1%), trans−pinocamphone (13.3%), β-pinene (10.7%), and β-phellandrene (5.3%) c Plaque reduction assay (RC-37 cells), HSV-1 1 [56]\nHyssopus officinalis L. cis−pinocamphone (40.1%), trans−pinocamphone (13.3%), β-pinene (10.7%), and β-phellandrene (5.3%) c Plaque reduction assay (RC-37 cells), HSV-2 6 [57]\nIllicium verum Hook. f. (E)−anethole (90.5%) c Plaque reduction assay (RC-37 cells), HSV-1 40 [58]\nIllicium verum Hook. f. (E)−anethole (90.5%) c Plaque reduction assay (RC-37 cells), HSV-1 1 [59]\nIllicium verum Hook. f. (E)−anethole (90.5%) c Plaque reduction assay (RC-37 cells), HSV-2 30 [57]\nJungia polita Griseb. caryophyllene oxide (9.2%) and β-caryophyllene (8.1%) Plaque reduction assay DENV−2, JUNV and HSV-1 39.8, 134.2 and 136.4 [38]\nJuniperus communis L. α-pinene (46.7%), myrcene (15.0%), sabinene (13.2%), and limonene (7.0%) c Plaque reduction assay (Vero cells), HSV-1 \u003e10000 [48]\nLavandula angustifolia Mill. linalyl acetate (37.0−43.6%), linalool (19.7−39.1%), geraniol (up to 9.3%), β-caryophyllene (up to 5.1%), terpinene−4−ol (up to 14.9%), lavandulol (up to 1.5%), lavandulyl acetate (up to 5.5%), 1,8-cineole (up to 4.1%), and borneol (up to 6.4%) 85% in vitro inhibition of influenza type A (H1N1) [46]\nLavandula latifolia Medik. linalool (31.9%), 1,8-cineole (18.8%), and borneol (10.1%) g Plaque reduction assay (Vero cells), HSV-1 2200 [48]\nLepechinia salviifolia (Kunth) Epling camphor (10.3%), limonene (9.7%), p−mentha−1(7),8−diene (7.4%), α-pinene (6.9%), and γ-terpinene (6.7%) Plaque reduction assay (Vero cells), HSV-1, HSV-2 68.8, 81.9 [55]\nLepechinia vulcanicola J.R.I. Wood limonene (18.9%), germacrene D (10.4%), 1−octen−3−ol (8.8%), β-caryophyllene (8.7%), and α-pinene (8.2%) Plaque reduction assay (Vero cells), HSV-1, HSV-2 112, 68.9 [55]\nLeptospermum scoparium J.R. Forst. \u0026 G. Forst. calamene (16.0%), leptospermone (14.5%), δ−cadinene (6.1%), flavesone (4.5%), viridiflorene (4.4%), and isoleptospermone (3.9%) Plaque reduction assay (RC-37 cells), HSV-1, HSV-2 0.96, 0.58 [60]\nLippia alba (Mill.) N.E. Br. ex Britton \u0026 P. Wilson carvone (51.0%), Limonene (33%), and bicyclosesquiphellandrene (7.0%) Virus yield assay (Vero cells), yellow fever virus (YFV) 100 μg/mL (100% inhibition) [43]\nLippia alba (Mill.) N.E. Br. ex Britton \u0026 P. Wilson carvone (39.7%), limonene (30.6%), and bicyclosesquiphellandrene (8.9%) Plaque reduction assay (Vero cells), DENV−1, DENV−2, DENV−3, DENV−4, YFV 17 DD 10.1, 0.4, 32.6, 21.1, 4.9 [61]\nLippia alba (Mill.) N.E. Br. ex Britton \u0026 P. Wilson carvone (39.7%), limonene (30.6%), and bicyclosesquiphellandrene (8.9%) Plaque reduction assay (Vero cells), Yellow fever (YFV) 4.3 [62]\nLippia citriodora Kunth (syn. Aloysia citriodora Palau) geranial (18.9%), neral (15.6%), limonene (10.7%), and 1,8-cineole (5.0) Plaque reduction assay (Vero cells), DENV−1, DENV−2, DENV−3, DENV−4, YFV 17 DD 1.9, 2.9, 2.6, 33.7, 5.7 [61]\nLippia citriodora Kunth (syn. Aloysia citriodora Palau) geranial (18.9%), neral (15.6%), limonene (10.7%), and 1,8-cineole (5.0) Plaque reduction assay (Vero cells), Yellow fever (YFV) 19.4 [62]\nLippia graveolens Kunth carvacrol (56.8%), o−cymene (32.1%), and γ-terpinene (3.7%) h MTT assay (Mardin−Darby bovine kidney cells), HSV-1, ACVR−HSV-1 (acyclovir−resistant HSV-1), HRSV (human respiratory syncytial virus) 99.6, 55.9, 68.0 [63]\nLippia junelliana (Moldenke) Tronc. piperitenone oxide (= rotundifolone) (36.5%), limonene (23.1%), camphor (7.9%), and spathulenol (6.5%) Plaque reduction assay (Vero cells), HSV-1 \u003e150 [37]\nLippia origanoides carvacrol (44.0%), thymol (15.0%), and γ-terpinene (10.0%) Virus yield assay (Vero cells), yellow fever virus (YFV) 11.1 μg/mL (100% inhibition) [43]\nLippia turbinata Griseb. limonene (60.6%), piperitenone oxide (17.4%), and β-caryophyllene (6.4%) Plaque reduction assay (Vero cells), HSV-1 \u003e 150 [37]\nMatricaria recutita L. α-bisabolol oxide A (13.4–55.9%), α-bisabolol oxide B (8.4–25.1%), bisabolone oxide A (2.9–11.4%), cis−bicycloether (= (Z)−spiroether) (3.6–17.7%), and (E)-β-farnesene (1.9–10.4%) i Plaque reduction assay (RC-37 cells), HSV-1 0.3 [58]\nMatricaria recutita L. α-bisabolol oxide A (13.4–55.9%), α-bisabolol oxide B (8.4–25.1%), bisabolone oxide A (2.9−11.4%), cis−bicycloether (= (Z)−spiroether) (3.6–17.7%), and (E)-β-farnesene (1.9–10.4%) i Plaque reduction assay (RC-37 cells), HSV-2 1.5 [57]\nMelaleuca alternifolia Cheel terpinen-4-ol (36.71%), γ-terpinene (22.20%), and α-terpinene (10.10%) Plaque reduction assay, influenza A⁄PR ⁄ 8 virus subtype H1N1 60 [31]\nMelaleuca alternifolia Cheel terpinen-4-ol (30–48%), γ-terpinene (10–28%), α-terpinene (5–13%), 1,8-cineole (up to 15%), terpinolene (1.5−5%), p-cymene (0.5–12%), α-pinene (1–6%), and α-terpineol (1.5–8%) 100% inhibition of influenza type A (H1N1) virus at 0.01%; type A (H11N9) virus to tea tree oil vapor caused 100% inhibition [46]\nMelaleuca alternifolia Cheel terpinen-4-ol (47.5%), γ-terpinene (20.2%), and α-terpinene (8.6%) c Plaque reduction assay (Vero cells), HSV-1 2700 [48]\nMelaleuca alternifolia Cheel terpinen-4-ol (47.5%), γ-terpinene (20.2%), and α-terpinene (8.6%) c Plaque reduction assay (Vero cells), HSV-1 13.2 [64]\nMelaleuca alternifolia Cheel terpinen-4-ol (47.5%), γ-terpinene (20.2%), and α-terpinene (8.6%) c Plaque reduction assay (RC-37 cells), HSV-1 2 [52]\nMelaleuca alternifolia Cheel terpinen-4-ol (47.5%), γ-terpinene (20.2%), and α-terpinene (8.6%) c Plaque reduction assay (HeLa cells), HSV-2 2700 [47]\nMelaleuca alternifolia Cheel terpinen-4-ol (47.5%), γ-terpinene (20.2%), and α-terpinene (8.6%) c Plaque reduction assay (Vero cells), HSV-1 significant plaque reduction at 10 and 5% v/v [65]\nMelaleuca armillaris (Sol. ex Gaertn.) Sm. 1,8-cineole (33.9%), terpinen-4-ol (18.8%), and γ-terpinene (10.4%) Plaque reduction assay (Vero cells), HSV-1 99% plaque reduction (concentration not given) [66]\nMelaleuca ericifolia Sm. methyl eugenol (96.84%) Plaque reduction assay (Vero cells), HSV-1 91.5% plaque reduction (concentration not given) [66]\nMelaleuca leucadendra (L.) L. 1,8-cineole (64.3%), α-terpineol (11.0%), and valencene (3.91%) Plaque reduction assay (Vero cells), HSV-1 92% plaque reduction (concentration not given) [66]\nMelissa officinalis L. neral (17−32%), geranial (23–43%), linalool (up to 9.0%), citronellal (0.7–20.3%), geraniol (up to 23.2%), β-caryophyllene (up to 11.3%), and caryophyllene oxide (0.4−31.7%) influenza A virus (H9N2) Significant reduction at 5 μg/mL [46]\nMelissa officinalis L. β-cubebene (15.4%), β-caryophyllene (14.2%), α-cadinol (7.2%), geranial (6.6%), and neral (5.8%) Plaque reduction assay (HEp−2 cells), HSV-2 21 [67]\nMelissa officinalis L. geranial (20.1%), β-caryophyllene (17.3%), and neral (13.6%) Plaque reduction assay (RC-37 cells), HSV-1, HSV-2 4, 0.8 [68]\nMentha × piperita L. menthol (42.8%), menthone (14.6%), and isomenthone (5.9%) Plaque reduction assay (RC-37 cells), HSV-1, HSV-2 20, 8 [69]\nMentha × piperita L. menthol (43.8%), menthone (19.7%), menthyl acetate (6.5%), and 1,8-cineole (5.0%) c Plaque reduction assay (Vero cells), HSV-1 2200 [48]\nMentha suaveolens Ehrh. limonene (7.4%), isopulegol (12.0%), and piperitenone oxide (41.8%) Plaque reduction assay, cytopathogenic murine norovirus 0.87 [70]\nMentha suaveolens Ehrh. piperitenone oxide (86.9%) Plaque reduction assay (Vero cells), HSV-1 5.1 [64]\nMinthostachys mollis Griseb. cis−piperitone epoxide (29.9%), piperitenone oxide (25.6%), menthone (7.4%), germacrene D (5.8%), and pulegone (5.5%) Plaque reduction assay (Vero cells), HSV-1, HSV-2 70.7, 68.0 [55]\nOcimum basilicum var. album (L.) Benth. linalool (53.8%) and eugenol (12.6%) j Plaque reduction assay (Vero cells), HSV-1 \u003e10000 [48]\nOcimum campechianum Mill. methyl eugenol (53.9%), β-caryophyllene (13.0%), α-bulnesene (5.4%), germacrene D (3.4%), and α-humulene (3.3%) Plaque reduction assay (Vero cells), HSV-2 74.33 [55]\nOriganum elongatum Emb. (leaf EO) p-cymene (16.2%), γ-terpinene (13.5%), thymol (14.2%), and carvacrol (19.2%) Plaque reduction assay, cytopathogenic murine norovirus 0.37 [70]\nOriganum elongatum Emb. (inflorescence EO) p-cymene (16.1%), γ-terpinene (7.3%), and carvacrol (40.1%), Plaque reduction assay, cytopathogenic murine norovirus 0.75 [70]\nOriganum majorana L. terpinen-4-ol (28.9%), γ-terpinene (14.9%), trans−sabinene hydrate (9.5%), α-terpinene (8.7%), and sabinene (7.2%) c Plaque reduction assay (Vero cells), HSV-1 2800 [48]\nOriganum majorana L. terpinen-4-ol (28.9%), γ-terpinene (14.9%), trans−sabinene hydrate (9.5%), α-terpinene (8.7%), and sabinene (7.2%) c Plaque reduction assay (HeLa cells), HSV-2 520 [47]\nOriganum vulgare L. trans−sabinene hydrate (21.0%), thymol (11.0%), and carvacrol methyl ether (11.0%) Virus yield assay (Vero cells), yellow fever virus (YFV) 100 μg/mL (100% inhibition) [43]\nOsmunda regalis L. hexahydrofarnesyl acetone ( = phytone) (11.8%), 2,4−di−t−butylphenol (6.8%), phytol (6.5%), hexadecene (4.1%), and octadecene (4.4%) Plaque reduction assay, Coxsackie virus B4 type 2 2.24 [71]\nPectis odorata Griseb. limonene (50.2%), neral (27.2%), and geranial (23.6%) Plaque reduction assay DENV−2, JUNV and HSV-1 39.6, 36.6, and 71.5 [38]\nPelargonium graveolens L’Hér. ex Aiton citronellol (21.9–37.5%), citronellyl formate (9.8–20.6%), geraniol (6.0–16.5%), geranyl formate (1.5–6.5%), menthone (up to 13%), isomenthone (up to 9.9%), and linalool (0.8−14.9%) influenza type A (H1N1) 95% inhibition at 0.3% [46]\nPinus mugo Turra δ-3-carene (23.9%), α-pinene (17.9%), β-pinene (7.8%), and β-phellandrene (7.2%) k Plaque reduction assay (RC-37 cells), HSV-1 7 [58]\nRavensara aromatica Sonn. (syn. Cryptocarya agathophylla van der Werff) 1,8-cineole (52.6%), α-terpineol (12.4%), and sabinene (11.0%) l Plaque reduction assay (Vero cells), HSV-1 2800 [48]\nRosmarinus officinalis L. α-pinene (23.9%), verbenone (15.4%), camphor (11.0%), camphene (8.7%), p-cymene (7.5%), and 3−octanone (5.6%) Plaque reduction assay (Vero cells), HSV-1 60 [41]\nRosmarinus officinalis L. 1,8-cineole (45.9%), α-pinene (12.0%), camphor (10.9%), and β-pinene (6.3%) b Plaque reduction assay (Vero cells), HSV-1 2700 [48]\nSalvia fruticosa Mill. 1,8-cineole (47.5%), camphor (9.0%), β-thujone (7.6%), and α-thujone (4.3%) Plaque reduction assay (Vero cells), HSV-1 and HSV-2 1300 [72]\nSantalum album L. (Z)−α-santalol (45.2%), (Z)-β-santalol (25.4%), and (Z)−trans−α-bergamotol (7.8%) c Plaque reduction assay (Vero cells), HSV-1, HSV-2 22.7, 45.3 [73]\nSantalum album L. (Z)−α-santalol (45.2%), (Z)-β-santalol (25.4%), and (Z)−trans−α-bergamotol (7.8%) c Plaque reduction assay (RC-37 cells), HSV-1 2 [56]\nSantalum album L. (Z)−α-santalol (45.2%), (Z)-β-santalol (25.4%), and (Z)−trans−α-bergamotol (7.8%) c Plaque reduction assay (RC-37 cells), HSV-2 5 [57]\nSantolina insularis (Gennari ex Fiori) Arrigoni artemisia ketone (21.2%), allo−aromadendrene (12.7%), 1,8-cineole (9.0%), and camphene (8.5%) m Plaque reduction assay (Vero cells), HSV-1 and HSV-2 0.88, 0.7 [74]\nSatureja hortensis L. carvacrol (32.4%), γ-terpinene (32.0%), thymol (10.0%), and p-cymene (6.6%) Plaque reduction assay (Vero cells), HSV-1 80 [41]\nTessaria absinthioides (Hook. \u0026 Arn.) DC. caryophyllene oxide (12.2%), (E)-β-damascenone, γ-eudesmol (8.5%), α-gurjunene (5.8%), and terpinen-4-ol (5.4%) Plaque reduction assay (Vero cells), HSV-1 105 [37]\nThymus capitatus (L.) Hoffmanns. \u0026 Link (unripe fruit EO) carvacrol (68.6%), p-cymene (4.8%), γ-terpinene (3.0%), and β-caryophyllene (2.9%) Plaque reduction assay, cytopathogenic murine norovirus 0.49 [70]\nThymus capitatus (L.) Hoffmanns. \u0026 Link (ripe fruit EO) carvacrol (58.8%), p-cymene (5.6%), γ-terpinene (2.8%), and β-caryophyllene (2.6%) Plaque reduction assay, cytopathogenic murine norovirus 0.50 [70]\nThymus vulgaris L. thymol (31–50%), p-cymene (0.1–26.6%), and γ-terpinene (up to 22.8%) 100% inhibition of type A (H1N1) virus at 0.3% concentration [46]\nThymus vulgaris L. thymol (43.9%), carvacrol (14.4%), p-cymene (10.5%), β-caryophyllene (7.0%), and γ-terpinene (5.1%) c Plaque reduction assay (RC-37 cells), HSV-1 10 [56]\nThymus vulgaris L. thymol (43.9%), carvacrol (14.4%), p-cymene (10.5%), β-caryophyllene (7.0%), and γ-terpinene (5.1%) c Plaque reduction assay (RC-37 cells), HSV-1 11 [52]\nThymus vulgaris L. thymol (43.9%), carvacrol (14.4%), p-cymene (10.5%), β-caryophyllene (7.0%), and γ-terpinene (5.1%) c Plaque reduction assay (RC-37 cells), HSV-2 7 [57]\nThymus willdenowii Boiss. 1,8-cineole (34.62%), camphor (18.55%), α-pinene (9.46%), and camphene (5.38%) Plaque reduction assay, Coxsackie virus Inactive [75]\nTrachyspermum ammi (L.) Sprague thymol (35–60%), α-pinene, p-cymene, and limonene Plaque reduction assay, Japanese encephalitis virus 80% reduction at 500 μg/mL [76]\nZataria multiflora Boiss. thymol (47.3%), carvacrol (21.9%), p-cymene (8.6%), γ-terpinene (4.2%), and β-caryophyllene (3.0%) Real time PCR (H9N2 subtype of AIV) Reduced viral replication in trachea of broiler chickens [77]\nZataria multiflora Boiss. thymol (33.1%), carvacrol (25.9%), and p-cymene (11.3%) Plaque reduction assay (Vero cells), HSV-1 30 [41]\nZingiber officinale Roscoe α-zingiberene (32.1%), ar−curcumene (15.2%), β-sesquiphellandrene (10.9%), α-farnesene (7.2%), and α-phellandrene (4.4%) Plaque reduction assay, Caprine alphaherpesvirus type I not determined [78]\nZingiber officinale Roscoe α-zingiberene (26.4%), camphene (12.6%), β-sesquiphellandrene (9.2%), ar−curcumene (6.5%), β-phellandrene (6.2%), and β-bisabolene (5.1%) c Plaque reduction assay (RC-37 cells), HSV-1 2 [56]\nZingiber officinale Roscoe α-zingiberene (26.4%), camphene (12.6%), β-sesquiphellandrene (9.2%), ar−curcumene (6.5%), β-phellandrene (6.2%), and β-bisabolene (5.1%) c Plaque reduction assay (RC-37 cells), HSV-2 1 [57]\na Reported as cadinol, but see [79,80]. b Essential oil composition not reported; essential oil composition obtained from [81]. c Essential oil composition not reported; essential oil composition of commercial (dōTERRA International, Pleasant Grove, Utah, USA). d Essential oil composition not reported; essential oil composition obtained from [82]. e Essential oil composition not reported; essential oil composition obtained from [83]. f Essential oil composition not reported; essential oil composition obtained from [84]. g Essential oil composition not reported; essential oil composition obtained from [85]. h Essential oil composition not reported; essential oil composition obtained from [86]. i Essential oil composition not reported; essential oil composition obtained from [87]. j Essential oil composition not reported; essential oil composition obtained from [88]. k Essential oil composition not reported; essential oil composition obtained from [89]. l Essential oil composition not reported; essential oil composition obtained from [90]. m Essential oil composition not reported; essential oil composition obtained from [91].\nTable 2 Antiviral activities of essential oil components.\nEssential Oil Component Assay IC50 (μg/mL) Reference\n(E)−Anethole Plaque reduction assay (RC-37 cells), HSV-1 20 [59]\nCamphor Plaque reduction assay (Vero cells), HSV-1 2600 [72]\nCarvacrol MTT assay (Mardin−Darby bovine kidney (MDBK) cells, HSV-1 48.6 [63]\nβ-Caryophyllene Plaque reduction assay (RC-37 cells), HSV-1 0.25 [59]\nCaryophyllene oxide Plaque reduction assay (RC-37 cells), HSV-1 0.7 [59]\n1,8-Cineole Plaque reduction assay (Vero cells), HSV-1 1800 [72]\n1,8-Cineole Plaque reduction assay (RC-37 cells), HSV-1 1200 [52]\n(E)-Cinnamaldehyde Influenza type A (H1N1) virus 70% at a concentration of 0.53% after 3 h [95]\n(E)-Cinnamaldehyde H1N1 in-vivo by inhalation in a mouse model 89% inhibition [95]\nCitral (Geranial + Neral) Yellow fever (YFV), Vero cells 17.6 [62]\nCitral (Geranial + Neral) Plaque reduction assay (RC-37 cells), HSV-1 3.50 [52]\np-Cymene Influenza, HSV-1, HSV-2, ECHO 9, Cox B1, Polio 1, Adeno 6 \u003e500 [31]\np-Cymene Plaque reduction assay (RC-37 cells), HSV-1 16 [52]\np-Cymene Influenza type A (H1N1) virus Inactive [25]\nDodecanal Influenza type A (H1N1) virus 51 [54]\nβ-Eudesmol Plaque reduction assay (Vero cells), HSV-1 6 [59]\nEugenol Plaque reduction assay (RC-37 cells), HSV-1 35 [59]\nEugenol Plaque reduction assay (RC-37 cells), HSV-1 25.6 [96]\nFarnesol Plaque reduction assay (RC-37 cells), HSV-1 3.5 [59]\nGermacrone Influenza type A (H1N1) virus 1.22–1.55 [97]\nGermacrone Influenza type A (H3N2) virus 0.34 [97]\nGermacrone Influenza type B virus 1.38 [97]\nIsoborneol Plaque reduction assay (Vero cells), HSV-1 \u003c1000 [98]\nNerolidol (natural) Plaque reduction assay (RC-37 cells), HSV-1 4.2 [99]\nNerolidol (synthetic) Plaque reduction assay (RC-37 cells), HSV-1 1.5 [99]\nOctanal Influenza type A (H1N1) virus 15 [54]\nPatchouli alcohol Influenza type A (H1N1) 89% inhibition at 10 μg/mL [100]\nPatchouli alcohol Influenza type A (H2N2) 0.89 [101]\nPatchouli alcohol Influenza type A (H2N2), in-vivo test using a mouse model 70% survival rate at a dose of 5 mg/(kg day) [101]\nα-Pinene Plaque reduction assay (RC-37 cells), HSV-1 4.5 [52]\nPiperitenone oxide Plaque reduction assay (Vero cells) 1.4 [64]\nα-Terpinene Influenza type A (H1N1) virus Inactive [25]\nα-Terpinene Influenza, HSV-1, HSV-2, ECHO 9, Cox B1, Polio 1, Adeno 4 \u003e12 [31]\nα-Terpinene Plaque reduction assay (RC-37 cells), HSV-1 8.5 [52]\nγ-Terpinene Plaque reduction assay (RC-37 cells), HSV-1 7 [52]\nγ-Terpinene Influenza, HSV-1, HSV-2, ECHO 9, Cox B1, Polio 1, Adeno 5 \u003e120 [31]\nγ-Terpinene influenza type A (H1N1) virus inactive [25]\nTerpinen-4-ol Influenza, HSV-1, HSV-2, ECHO 9, Cox B1, Polio 1, Adeno 2 25 (influenza)\u003e50 (others) [31]\nTerpinen-4-ol Plaque reduction assay (Vero cells), HSV-1 60 [52]\nα-Terpineol Plaque reduction assay (RC-37 cells), HSV-1 22 [52]\nTerpinolene Influenza, HSV-1, HSV-2, ECHO 9, Cox B1, Polio 1, Adeno 3 12 (influenza)\u003e12 (others) [31]\nThujones (α \u0026 β) Plaque reduction assay (RC-37 cells), HSV-1 400 [72]\nThymol Influenza type A (H1N1) virus Active [25]\nThymol Plaque reduction assay (RC-37 cells), HSV-1 30 [52]\n2-Undecanone influenza type A (H1N1) virus 62 [54]\nTable 3 Docking scores, normalized for molecular weight (DSnorm, kJ/mol), of essential oil components with severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) molecular targets.\nCompound MainProtease Endoribo-Nuclease ADP RibosePhosphatase RNA-DependentRNA Polymerase Spike ProteinBinding Domain Angiotensin-Converting Enzyme a\n(E)-Anethole −84.9 −83.0 −97.5 −74.0 −65.2 −83.8\nallo-Aromadendrene −86.6 −86.9 −95.8 −74.9 −66.1 −85.3\nArtemiseole −89.2 −83.4 −96.6 −73.0 −67.8 −78.0\n(R)-Artemisia alcohol −84.3 −78.3 −88.2 −66.8 −61.1 −74.7\n(S)-Artemisia alcohol −86.1 −85.4 −98.5 −69.5 −67.1 −77.4\nArtemisia ketone −91.0 −85.7 −97.9 −71.9 −66.9 −77.3\nAscaridole −74.8 −68.2 −86.0 −65.2 −62.6 −64.4\nBenzyl benzoate −104.9 −96.5 −110.3 −82.5 −74.9 −96.4\n(Z)-trans-α-Bergamotol −98.0 −91.2 −105.9 −71.9 −63.6 −83.6\nBicyclogermacrene −85.9 −88.0 −92.5 −75.6 −68.2 −86.1\nBicyclosesquiphellandrene −79.4 −89.6 −86.0 −61.8 −62.5 −78.2\nα-Bisabolol oxide A −88.5 −87.6 −89.1 −71.5 −63.5 −89.7\nα-Bisabolol oxide B −96.6 −92.2 −101.0 −79.7 −75.2 −95.6\nBisabolone oxide A −93.7 −87.9 −98.2 −73.3 −71.0 −78.7\n(+)-Borneol −77.4 −91.8 −100.1 −74.1 −70.9 −73.3\n(−)-Borneol −71.4 −71.5 −78.4 −56.7 −50.1 −73.7\n(+)-iso-Borneol −75.6 −75.3 −75.9 −60.8 −53.2 −71.8\n(−)-iso-Borneol −73.8 −69.2 −75.6 −54.8 −49.3 −72.4\nα-Bulnesene −95.2 −72.4 −78.4 −57.0 −57.8 −101.7\nδ-Cadinene −91.6 −90.2 −112.6 −75.2 −60.0 −93.4\nτ-Cadinol −92.3 −82.8 −82.5 −69.9 −69.8 −87.8\n(R)-Calamene −92.3 −83.5 −97.4 −69.0 −65.6 −87.3\n(S)-Calamene −88.4 −86.8 −95.9 −70.2 −64.7 −87.5\n(+)-Camphene −85.6 −78.9 −83.2 −64.4 −57.9 −72.2\n(−)-Camphene −77.2 −74.1 −87.1 −66.0 −59.8 −67.1\n(+)-Camphor −75.2 −73.1 −77.9 −63.9 −53.8 −69.4\n(−)-Camphor −72.5 −70.0 −75.6 −64.3 −52.8 −70.8\n(+)-δ-3-Carene −87.9 −78.6 −87.0 −65.0 −72.4 −75.8\n(−)-δ-3-Carene −83.9 −88.0 −90.4 −66.8 −67.3 −73.4\nCarvacrol −84.5 −86.6 −94.8 −74.1 −71.0 −81.2\nCarvacrol methyl ether −85.5 −82.5 −103.1 −74.6 −65.8 −83.7\n(+)-cis−Carveol −87.0 −81.8 −97.7 −76.5 −69.7 −80.4\n(−)-cis−Carveol −85.6 −85.0 −95.6 −76.8 −74.3 −81.2\n(R)-Carvone −87.7 −82.4 −98.2 −74.7 −69.2 −83.4\n(S)-Carvone −86.2 −83.2 −98.9 −73.2 −66.3 −82.2\n(E)-Caryophyllene −81.2 −82.2 −93.9 −73.4 −59.2 −75.1\nCaryophyllene oxide −80.6 −86.7 −97.0 −74.1 −66.5 −83.3\nCedrol −82.3 −84.4 −80.1 −69.7 −58.3 −69.9\nepi-Cedrol −76.4 −88.4 −92.2 −68.5 −55.5 −75.9\nChamazulene −97.6 −96.4 −110.9 −76.9 −73.7 −95.6\n(−)-cis-Chrystanthyl acetate −83.2 −77.5 −87.1 −71.5 −60.2 −80.9\n(−)-trans−Chrysanthenyl acetate −77.0 −81.4 −85.3 −65.9 −68.9 −72.4\n1,8-Cineole −72.7 −67.6 −71.5 −58.1 −58.6 −61.0\n(E)-Cinnamaldehyde −93.1 −85.8 −100.0 −76.4 −73.1 −81.0\n(E)-Cinnamyl acetate −99.4 −88.0 −108.9 −76.9 −80.6 −89.5\n(R)-Citronellal −99.9 −91.6 −105.0 −75.1 −73.3 −88.0\n(S)-Citronellal −98.3 −88.9 −107.4 −72.1 −71.4 −86.2\n(R)-Citronellol −99.9 −90.2 −104.9 −75.7 −72.3 −84.9\n(S)-Citronellol −99.2 −92.2 −107.6 −74.2 −77.4 −85.1\n(R)-Citronellyl formate −105.5 −92.6 −109.9 −72.8 −76.2 −90.5\n(S)-Citronellyl formate −101.5 −96.4 −114.7 −81.9 −78.3 −91.0\nα-Copaene −84.1 −78.9 −85.9 −60.2 −59.6 −77.1\nCostunolide −94.5 −99.2 −110.2 −78.2 −74.9 −92.6\n(R)-Cryptone −86.6 −82.4 −93.5 −68.2 −70.4 −74.8\n(S)-Cryptone −81.5 −82.9 −94.9 −69.8 −70.6 −76.6\nβ-Cubebene −90.8 −92.0 −86.7 −76.0 −71.2 −89.8\nCuminaldehyde −86.2 −80.5 −103.3 −74.9 −67.5 −81.7\nar-Curcumene −105.3 −94.0 −108.6 −82.8 −75.8 −96.4\nCurcumol −83.0 −93.4 −91.2 −73.5 −69.6 −86.0\nCurdione −86.2 −98.1 −99.0 −77.3 −71.7 −92.0\nCurzerene −91.5 −86.0 −104.2 −76.8 −67.6 −90.5\nm-Cymene −83.6 −81.3 −92.8 −72.0 −67.6 −79.0\no-Cymene −83.2 −78.3 −87.7 −63.9 −63.3 −72.9\np-Cymene −79.7 −78.7 −91.0 −70.3 −63.9 −75.4\n(E)-β-Damascenone −85.2 −87.6 −110.2 −73.8 −73.8 −84.8\n(2E,4E)-Decadienal −105.7 −97.7 −112.5 −81.8 −78.7 −90.0\nDodecanal −102.8 −93.9 −101.9 −77.9 −73.3 −94.9\nEremanthin −97.7 −97.7 −98.0 −83.7 −81.3 −100.9\nβ-Eudesmol −97.6 −87.4 −106.5 −75.8 −64.5 −74.7\nγ-Eudesmol −93.6 −89.9 −94.7 −69.4 −66.1 −84.3\nEugenol −93.2 −91.7 −105.2 −80.0 −79.1 −88.4\nEugenol methyl ether −88.5 −85.3 −111.1 −71.7 −68.6 −89.3\nEugenyl acetate −96.3 −89.3 −115.1 −75.6 −70.6 −94.9\n(E,E)-α-Farnesene −115.0 −107.5 −112.8 −86.8 −85.3 −100.3\n(E)-β-Farnesene −115.4 −105.0 −116.3 −87.1 −82.9 −100.7\n(E,E)-Farnesol −112.4 −104.6 −121.4 −89.6 −80.8 −100.9\n(+)-Fenchone −80.0 −80.9 −87.1 −66.1 −60.8 −66.9\n(-)-Fenchone −83.3 −67.5 −86.2 −66.5 −60.9 −68.8\nFlavesone −82.3 −84.0 −95.7 −68.9 −64.4 −78.9\nGeranial −101.7 −90.8 −113.0 −76.1 −74.5 −92.0\nGeraniol −103.5 −98.5 −110.2 −77.4 −76.4 −93.8\nGeranyl formate −105.9 −93.9 −111.4 −80.8 −80.3 −96.2\nGermacrene D −92.1 −96.7 −110.5 −77.1 −73.0 −87.3\nGermacrone −85.1 −97.1 −94.9 −71.6 −67.1 −80.9\nGuiaol −94.1 −92.5 −113.4 −79.2 −79.4 −91.9\nα-Gurjunene −89.9 −83.2 −81.3 −71.5 −61.3 −79.8\nβ-Gurjunene −77.4 −64.1 −81.1 −64.1 −58.0 −75.1\nα-Himachalene −80.4 −89.7 −86.5 −63.7 −67.9 −74.3\nβ-Himachalene −85.5 −81.3 −88.6 −68.1 −62.9 −77.2\nHimachalol −77.2 −88.3 −100.8 −63.6 −63.7 −75.6\nα-Humulene −88.9 −90.9 −89.1 −74.9 −70.6 −86.7\nLeptospermone −85.5 −83.2 −92.9 −71.2 −64.1 −80.0\niso-Leptospermone −86.1 −82.7 −93.7 −69.1 −62.6 −83.5\n(R)-Limonene −82.2 −76.2 −92.0 −72.6 −67.3 −79.0\n(S)-Limonene −82.2 −73.8 −92.2 −72.4 −66.1 −77.5\n(R,S,R)-Limonene oxide −86.3 −77.7 −100.8 −76.7 −68.1 −85.1\n(S,R,R)-Limonene oxide −83.5 −87.4 −89.4 −66.7 −63.4 −76.4\n(S,R,S)-Limonene oxide −84.7 −80.7 −95.8 −74.9 −66.7 −83.8\n(R)-Linalool −96.0 −89.3 −101.4 −70.9 −79.0 −87.0\n(S)-Linalool −100.7 −87.5 −102.1 −71.4 −70.4 −87.8\n(R)-Linalyl acetate −101.4 −88.9 −105.1 −73.0 −74.3 −82.5\n(S)-Linalyl acetate −102.8 −90.8 −106.0 −68.5 −74.5 −82.3\np-Mentha-1(7),8-diene −82.3 −82.2 −94.3 −69.5 −65.9 −79.3\n(+)-Menthol −82.9 −86.2 −95.0 −71.8 −66.6 −77.7\n(-)-Menthol −82.3 −84.5 −95.1 −71.1 −69.2 −79.4\nMenthone −83.2 −77.8 −94.7 −69.3 −70.0 −74.4\niso-Menthone −81.0 −79.8 −97.6 −64.4 −63.5 −80.1\nα-Muurolene −86.9 −81.9 −96.9 −72.0 −66.0 −83.7\n(+)-γ-Muurolene −82.3 −82.9 −83.1 −72.2 −66.6 −84.4\n(-)-γ-Muurolene −88.4 −86.2 −106.7 −74.5 −68.5 −86.8\nMyrcene −98.7 −90.1 −102.2 −74.9 −71.4 −84.3\nNeral −102.6 −91.8 −110.5 −81.5 −72.4 −91.2\n(E)-Nerolidol −110.7 −101.4 −113.8 −83.5 −76.1 −100.6\n(E)-β-Ocimene −97.0 −90.2 −103.6 −76.3 −75.6 −86.7\n(Z)-β-Ocimene −98.3 −88.7 −103.2 −78.6 −73.9 −85.1\nOctanal −89.7 −83.8 −99.5 −71.3 −72.4 −80.5\n(R)-2-Octen-3-ol −88.1 −88.4 −96.6 −71.9 −70.7 −81.9\n(S)-1-Octen-3-ol −94.2 −90.7 −93.4 −77.1 −74.7 −80.0\n3-Octanone −88.9 −85.3 −94.7 −71.7 −72.9 −80.3\nPatchouli alcohol −63.5 −57.1 −66.7 −51.8 −43.0 −67.9\n(R)-Phellandral −87.6 −85.9 −102.5 −74.4 −66.2 −81.1\n(S)-Phellandral −87.7 −83.7 −101.6 −74.4 −66.5 −79.2\n(R)-α-Phellandrene −81.1 −82.9 −92.5 −70.1 −65.3 −76.4\n(S)-α-Phellandrene −81.6 −82.5 −92.3 −69.7 −65.6 −76.6\n(R)-β-Phellandrene −84.4 −83.7 −94.0 −69.8 −65.5 −75.2\n(S)-β-Phellandrene −82.9 −84.5 −94.0 −71.2 −67.5 −77.7\nPhytol −106.3 −94.2 −118.9 −74.9 −75.6 −93.3\nPhytone −106.4 −94.3 −116.9 −79.8 −72.3 −90.4\n(+)-α-Pinene −79.0 −70.7 −79.7 −59.4 −54.6 −63.7\n(-)-α-Pinene −77.3 −70.4 −72.9 −61.3 −54.7 −63.6\n(+)-β-Pinene −76.8 −71.8 −79.4 −63.7 −53.0 −65.2\n(-)-β-Pinene −78.8 −73.6 −73.9 −61.9 −56.1 −64.7\n(+)-Pinocamphone −74.9 −72.6 −79.4 −63.2 −62.4 −66.4\n(-)-Pinocamphone −73.2 −79.3 −81.8 −62.0 −61.4 −67.2\n(+)-iso-Pinocamphone −74.9 −75.0 −74.9 −66.6 −55.1 −66.5\n(-)-iso-Pinocamphone −77.1 −80.7 −77.5 −64.0 −55.6 −68.3\n(+)-cis-Pinocarveol −73.9 −78.1 −79.5 −67.7 −57.4 −70.2\n(-)-cis-Pinocarveol −74.1 −76.5 −78.8 −67.0 −58.6 −66.3\n(+)-trans-Pinocarveol −74.7 −80.5 −78.7 −65.8 −57.2 −70.6\n(-)-trans-Pinocarveol −77.6 −80.0 −82.6 −60.5 −55.5 −70.8\n(+)-Piperitone oxide −82.0 −81.5 −98.5 −66.2 −65.2 −77.8\n(-)-Piperitone oxide −81.6 −83.9 −94.9 −68.6 −60.8 −82.8\n(-)-iso-Pulegol −82.5 −85.1 −98.8 −75.2 −66.7 −79.3\n(R)-Pulegone −84.0 −83.1 −96.1 −66.4 −65.5 −78.3\n(S)-Pulegone −83.6 −78.6 −93.3 −67.2 −66.2 −78.9\nRotundifolone −83.1 −79.0 −96.6 −66.4 −62.1 −80.7\n(+)-Sabinene −86.4 −84.0 −92.2 −70.5 −68.6 −77.4\n(-)-Sabinene −87.8 −85.9 −94.7 −71.5 −69.6 −77.0\ncis-Sabinene hydrate −82.4 −81.1 −92.4 −68.0 −60.8 −78.2\n(Z)-α-Santalol −105.7 −95.3 −108.8 −84.7 −70.7 −95.8\n(E)-β-Santalol −104.8 −95.6 −106.2 −77.0 −70.9 −86.6\n(Z)-β-Santalol −104.4 −94.4 −106.2 −79.8 −73.2 −92.2\nβ-Sesquiphellandrene −103.8 −99.0 −115.7 −84.8 −75.3 −101.1\nSpathulenol −90.7 −88.0 −98.4 −77.8 −67.9 −90.4\n(Z)-Spiroether −111.8 −84.9 −103.1 −87.1 −79.3 −102.0\nγ-Terpinene −81.3 −79.3 −93.2 −71.2 −65.3 −76.6\n(R)-Terpinen-4-ol −80.4 −81.9 −89.5 −69.0 −64.9 −75.3\n(S)-Terpinen-4-ol −82.1 −81.8 −88.0 −70.4 −64.4 −76.4\n(R)-α-Terpineol −82.6 −88.3 −91.6 −65.6 −66.0 −72.6\n(S)-α-Terpineol −88.7 −86.8 −94.1 −71.6 −63.5 −82.0\nTerpinolene −80.7 −80.1 −94.7 −68.8 −63.9 −77.4\n(-)-α-Thujone −87.2 −89.3 −94.5 −66.9 −69.2 −78.1\n(+)-β-Thujone −86.9 −80.5 −94.2 −73.7 −69.7 −79.2\nThymohydroquinone dimethyl ether −89.5 −82.8 −104.6 −73.1 −67.0 −85.0\nThymol −84.4 −87.5 −94.6 −72.9 −70.8 −78.4\n2-Undecanone −101.3 −94.0 −108.3 −78.4 −72.8 −90.2\nValencene −84.7 −81.7 −92.6 −74.4 −68.3 −81.7\n(+)-Verbenone −84.7 −73.2 −82.5 −68.4 −54.8 −71.2\n(-)-Verbenone −83.8 −77.7 −77.4 −65.4 −57.8 −68.0\nViridiflorene −86.8 −90.2 −91.0 −76.3 −69.4 −88.8\nα-Zingiberene −106.4 −100.5 −115.4 −82.7 −71.4 −98.6\na Human angiotensin-converting enzyme 2 (hACE2).\nTable 4 Normalized docking scores ( DSnorm, kJ/mol) of essential oil components with bovine odorant binding protein (BtOBP), cruzain, torpedo acetylcholinesterase (TcAChE), Bacillus anthracis nicotinate mononucleotide adenylytransferase (BaNadD), Russell’s viper phospholipase A2 (DrPLA2), and Escherichia coli l-aspartate aminotransferase (EcAspTA).\nCompound BtOBP Cruzain TcAChE BaNadD DrPLA2 EcAspTA\n1GT3 1ME3 6G1U 3HFJ 1FV0 2Q7W\n(E)-Anethole −90.2 −73.3 −96.8 −112.9 −85.3 −88.1\nallo-Aromadendrene −85.0 −70.6 −92.8 −105.8 −87.8 −79.6\nArtemiseole −84.8 −74.2 −84.2 −90.6 −68.0 −71.7\n(R)-Artemisia alcohol −88.4 −68.3 −89.5 −94.8 −80.7 −81.5\n(S)-Artemisia alcohol −86.1 −74.0 −94.8 −101.4 −82.5 −81.4\nArtemisia ketone −93.1 −77.3 −91.5 −107.9 −87.8 −80.6\nAscaridole −79.7 −54.4 −72.1 −79.7 −75.0 −65.3\nBenzyl benzoate −105.0 −82.8 −115.8 −128.1 −97.3 −89.9\n(Z)-trans-α-Bergamotol −1 00.7 −73.6 −107.0 −94.2 −92.6 −85.8\nBicyclogermacrene −97.5 −82.4 −95.6 −105.5 −89.7 −89.0\nBicyclosesquiphellandrene −92.2 −52.5 −91.2 −110.7 −88.4 −75.7\nα-Bisabolol oxide A −94.7 −66.1 −102.8 −102.6 −77.1 −82.7\nα-Bisabolol oxide B −104.6 −90.4 −107.0 −121.9 −94.2 −89.8\nBisabolone oxide A −100.1 −71.9 −96.8 −84.7 −81.2 −86.7\n(+)-Borneol −72.5 −51.0 −72.0 −47.8 −61.4 −62.5\n(-)-Borneol −78.3 −53.1 −70.8 −49.0 −63.3 −56.2\n(+)-iso-Borneol −73.7 −55.6 −74.6 −31.0 −60.9 −59.7\n(-)-iso-Borneol −73.2 −55.3 −77.7 −52.6 −51.0 −57.4\nα-Bulnesene −93.4 −89.3 −109.3 −115.7 −94.4 −95.3\nδ-Cadinene −79.5 −86.8 −105.1 −116.8 −94.8 −82.3\nΤ-Cadinol −87.8 −71.8 −117.7 −121.7 −86.0 −87.0\n(R)-Calamene −80.3 −84.4 −116.5 −120.4 −91.3 −87.7\n(S)-Calamene −80.1 −82.5 −116.2 −121.8 −93.0 −88.3\n(+)-Camphene −79.0 −62.1 −77.0 −75.9 −69.3 −67.5\n(-)-Camphene −77.7 −62.8 −75.2 −77.4 −71.3 −70.6\n(+)-Camphor −76.0 −57.0 −75.0 −49.0 −53.5 −54.1\n(-)-Camphor −80.0 −54.1 −74.4 −52.9 −61.2 −56.4\n(+)-δ-3-Carene −80.4 −64.2 −80.6 −88.0 −71.8 −72.5\n(-)-δ-3-Carene −82.0 −68.9 −84.4 −90.2 −72.8 −72.9\nCarvacrol −82.4 −77.7 −94.8 −106.7 −81.6 −87.5\nCarvacrol methyl ether −85.6 −79.3 −96.6 −111.5 −84.2 −93.6\n(+)-cis-Carveol −89.1 −77.3 −96.9 −109.4 −81.3 −87.6\n(-)-cis-Carveol −89.0 −82.1 −95.5 −109.0 −83.2 −89.4\n(R)-Carvone −86.0 −80.7 −94.6 −109.9 −83.5 −91.5\n(S)-Carvone −88.0 −77.2 −94.1 −105.9 −82.8 −87.2\n(E)-Caryophyllene −87.3 −60.4 −88.1 −87.3 −87.4 −78.6\nCaryophyllene oxide −95.1 −73.1 −90.1 −97.0 −83.8 −77.8\nCedrol −87.7 −63.1 −96.4 −84.4 −86.3 −70.9\nepi-Cedrol −84.0 −59.7 −83.3 −86.7 −80.0 −76.2\nChamazulene −95.2 −89.2 −123.0 −132.1 −98.9 −101.6\n(-)-cis-Chrystanthyl acetate −85.8 −63.7 −89.8 −73.8 −76.5 −71.5\n(-)-trans-Chrysanthenyl acetate −80.9 −69.7 −82.4 −78.5 −76.5 −68.6\n1,8-Cineole −69.3 −51.1 −73.2 −54.4 −49.4 −47.3\n(E)-Cinnamaldehyde −87.7 −77.6 −98.2 −110.1 −85.7 −89.5\n(E)-Cinnamyl acetate −95.9 −88.2 −107.4 −132.5 −94.6 −103.1\n(R)-Citronellal −98.1 −90.5 −109.3 −120.7 −88.3 −105.7\n(S)-Citronellal −95.0 −89.7 −108.5 −123.3 −86.9 −104.1\n(R)-Citronellol −91.0 −90.0 −108.2 −122.4 −88.6 −107.7\n(S)-Citronellol −92.5 −91.9 −108.5 −122.0 −90.3 −100.3\n(R)-Citronellyl formate −98.0 −93.5 −118.7 −129.5 −87.5 −108.5\n(S)-Citronellyl formate −99.7 −95.1 −111.2 −135.6 −91.5 −94.8\nα-Copaene −88.9 −69.9 −84.6 −78.7 −81.7 −61.9\nCostunolide −106.8 −87.5 −116.7 −120.1 −100.3 −89.1\n(R)-Cryptone −74.9 −68.1 −92.2 −100.0 −78.5 −80.8\n(S)-Cryptone −79.0 −68.5 −91.6 −100.7 −82.7 −79.6\nβ-Cubebene −99.8 −67.2 −106.9 −112.2 −93.9 −94.8\nCuminaldehyde −84.9 −79.1 −95.3 −109.1 −90.1 −89.5\nar-Curcumene −98.1 −87.5 −116.0 −125.7 −94.1 −95.3\nCurcumol −90.1 −67.6 −100.4 −88.0 −87.6 −81.5\nCurdione −96.4 −75.1 −99.3 −116.3 −91.0 −78.7\nCurzerene −96.4 −80.3 −109.4 −89.7 −91.1 −86.4\nm-Cymene −78.9 −73.1 −96.1 −99.1 −76.6 −88.0\no-Cymene −77.0 −61.9 −89.8 −97.8 −76.2 −77.2\np-Cymene −82.8 −73.2 −91.3 −96.8 −80.9 −84.3\n(E)-β-Damascenone −90.1 −80.5 −100.7 −105.4 −88.9 −80.0\n(2E,4E)-Decadienal −96.4 −87.0 −110.4 −129.7 −95.8 −114.8\nDodecanal −95.8 −83.7 −110.3 −127.3 −89.2 −108.9\nEremanthin −80.1 −87.9 −121.3 −132.4 −98.7 −91.8\nβ-Eudesmol −95.2 −76.1 −98.6 −114.1 −85.3 −87.1\nγ-Eudesmol −94.9 −78.2 −106.1 −105.2 −89.7 −89.1\nEugenol −90.4 −82.4 −103.9 −119.3 −87.3 −98.8\nEugenol methyl ether −93.6 −78.1 −106.3 −116.8 −89.3 −94.4\nEugenyl acetate −94.9 −83.4 −109.2 −126.1 −100.1 −104.6\n(E,E)-α-Farnesene −115.5 −103.7 −129.8 −131.8 −101.2 −111.4\n(E)-β-Farnesene −112.1 −103.2 −122.7 −131.8 −105.3 −108.6\n(E,E)-Farnesol −116.8 −96.2 −133.0 −135.6 −100.5 −109.0\n(+)-Fenchone −78.4 −60.5 −79.5 −79.8 −62.4 −69.9\n(-)-Fenchone −80.3 −61.5 −81.0 −84.2 −65.5 −60.7\nFlavesone −87.1 −56.0 −88.6 −92.1 −85.2 −80.3\nGeranial −96.5 −94.9 −111.7 −119.3 −92.1 −101.5\nGeraniol −95.5 −93.6 −109.7 −118.0 −94.3 −107.3\nGeranyl formate −100.2 −89.7 −115.4 −128.3 −94.8 −114.1\nGermacrene D −102.4 −88.8 −109.9 −116.5 −93.7 −90.0\nGermacrone −92.4 −68.3 −94.5 −102.9 −88.3 −80.0\nGuiaol −100.8 −88.5 −113.3 −107.5 −92.6 −94.0\nα-Gurjunene −80.6 −61.6 −84.6 −100.0 −83.6 −78.1\nβ-Gurjunene −89.3 −38.8 −80.3 11.3 −77.6 −71.1\nα-Himachalene −89.2 −67.9 −83.9 −96.3 −87.6 −73.4\nβ-Himachalene −81.9 −65.4 −96.1 −110.8 −91.4 −76.8\nHimachalol −91.5 −64.1 −81.2 −24.7 −81.7 −66.3\nα-Humulene −94.0 −80.0 −89.9 −113.6 −89.2 −82.5\nLeptospermone −89.6 −64.0 −92.2 −102.7 −88.8 −80.7\niso-Leptospermone −92.8 −63.0 −90.1 −99.4 −86.2 −78.2\n(R)-Limonene −86.2 −75.7 −92.4 −99.6 −81.7 −86.8\n(S)-Limonene −84.9 −77.6 −93.4 −99.8 −83.3 −87.3\n(R,S,R)-Limonene oxide −87.1 −76.0 −93.2 −110.7 −84.9 −86.3\n(S,R,R)-Limonene oxide −84.6 −68.8 −85.0 −84.3 −76.2 −69.8\n(S,R,S)-Limonene oxide −91.2 −73.8 −97.4 −93.6 −85.1 −87.9\n(R)-Linalool −95.5 −89.9 −116.6 −112.4 −90.3 −89.9\n(S)-Linalool −93.0 −88.9 −110.1 −111.9 −91.0 −95.7\n(R)-Linalyl acetate −96.9 −87.1 −107.1 −112.5 −87.1 −95.2\n(S)-Linalyl acetate −100.0 −90.5 −110.2 −114.3 −86.6 −87.1\np-Mentha-1(7),8-diene −83.3 −74.4 −93.6 −100.0 −82.9 −84.9\n(+)-Menthol −86.1 −66.4 −98.6 −106.1 −79.2 −90.8\n(-)-Menthol −81.0 −68.9 −97.5 −106.3 −80.5 −89.7\nMenthone −82.4 −72.0 −92.6 −98.2 −82.8 −83.5\niso-Menthone −79.9 −64.8 −88.2 −102.4 −75.1 −82.0\nα-Muurolene −91.2 −79.9 −95.6 −113.7 −90.0 −82.8\n(+)-γ-Muurolene −85.2 −77.0 −98.7 −113.9 −93.2 −78.7\n(-)-γ-Muurolene −83.1 −83.4 −96.9 −106.3 −82.9 −80.5\nMyrcene −90.4 −88.8 −109.0 −112.7 −90.3 −101.1\nNeral −95.1 −94.1 −111.1 −122.8 −90.9 −105.4\n(E)-Nerolidol −111.5 −101.8 −131.9 −131.3 −99.6 −110.5\n(E)-β-Ocimene −91.8 −89.4 −104.6 −116.4 −89.0 −97.0\n(Z)-β-Ocimene −89.7 −90.6 −106.8 −112.1 −90.3 −94.4\nOctanal −85.8 −79.8 −97.6 −112.0 −85.7 −102.7\n(R)-2-Octen-3-ol −84.3 −81.5 −106.9 −107.1 −83.3 −101.1\n(S)-1-Octen-3-ol −84.5 −82.4 −108.4 −105.9 −85.0 −99.5\n3-Octanone −84.2 −82.5 −102.6 −111.6 −82.9 −101.8\nPatchouli alcohol −75.1 −41.4 −71.1 100.1 −10.1 −49.2\n(R)-Phellandral −92.3 −79.3 −97.4 −108.1 −88.9 −89.5\n(S)-Phellandral −92.9 −79.9 −96.1 −109.2 −88.9 −88.8\n(R)-α-Phellandrene −84.0 −69.7 −94.7 −100.8 −82.4 −83.8\n(S)-α-Phellandrene −84.3 −69.6 −93.5 −99.4 −82.6 −80.6\n(R)-β-Phellandrene −82.2 −69.9 −93.5 −102.0 −80.6 −84.1\n(S)-β-Phellandrene −83.8 −69.0 −93.2 −100.5 −80.2 −81.2\nPhytol −112.8 −93.8 −132.4 −134.7 −102.4 −112.9\nPhytone −117.8 −92.1 −124.5 −131.1 −99.7 −107.2\n(+)-α-Pinene −74.2 −58.0 −73.4 −62.4 −62.5 −54.4\n(-)-α-Pinene −72.8 −58.3 −70.4 −64.6 −61.7 −57.2\n(+)-β-Pinene −70.9 −57.8 −74.0 −64.1 −60.9 −55.5\n(-)-β-Pinene −73.5 −58.4 −73.1 −65.0 −63.7 −57.0\n(+)-Pinocamphone −76.5 −58.2 −73.6 −53.1 −55.4 −63.6\n(-)-Pinocamphone −76.6 −66.1 −76.5 −65.9 −72.3 −62.7\n(+)-iso-Pinocamphone −75.3 −59.0 −76.6 −54.0 −59.1 −58.1\n(-)-iso-Pinocamphone −76.2 −59.6 −76.7 −56.4 −65.8 −56.2\n(+)-cis-Pinocarveol −75.7 −58.2 −75.2 −51.7 −57.5 −58.1\n(-)-cis-Pinocarveol −75.7 −63.9 −73.5 −52.5 −66.3 −54.5\n(+)-trans-Pinocarveol −77.5 −60.6 −76.5 −71.1 −63.9 −61.4\n(-)-trans-Pinocarveol −72.4 −58.6 −77.2 −71.4 −56.3 −62.6\n(+)-Piperitone oxide −88.5 −70.5 −100.5 −104.2 −80.4 −78.0\n(-)-Piperitone oxide −86.0 −73.6 −99.6 −104.5 −80.7 −83.8\n(-)-iso-Pulegol −85.1 −72.0 −93.5 −106.7 −83.5 −93.8\n(R)-Pulegone −81.8 −69.9 −90.3 −103.9 −78.4 −74.4\n(S)-Pulegone −79.7 −69.6 −89.3 −99.9 −81.5 −76.4\nRotundifolone −86.1 −72.1 −96.1 −100.0 −82.4 −72.1\n(+)-Sabinene −87.9 −66.6 −84.5 −92.1 −80.5 −78.2\n(-)-Sabinene −79.7 −68.4 −91.4 −96.0 −80.8 −75.8\ncis-Sabinene hydrate −88.1 −70.2 −84.5 −91.1 −72.3 −68.1\n(Z)-α-Santalol −108.5 −85.6 −113.4 −106.8 −96.8 −90.7\n(E)-β-Santalol −105.0 −90.2 −110.6 −113.3 −94.3 −94.0\n(Z)-β-Santalol −108.0 −85.3 −110.4 −110.9 −96.5 −92.6\nβ-Sesquiphellandrene −103.9 −92.2 −116.6 −127.5 −99.4 −98.3\nSpathulenol −95.9 −94.8 −97.7 −102.8 −84.3 −102.2\n(Z)-Spiroether −112.8 −85.5 −124.3 −136.1 −101.5 −102.9\nγ-Terpinene −84.3 −74.9 −93.4 −98.7 −82.8 −85.9\n(R)-Terpinen-4-ol −87.3 −66.7 −81.5 −94.0 −80.2 −72.2\n(S)-Terpinen-4-ol −87.1 −67.2 −78.9 −92.3 −80.2 −71.7\n(R)-α-Terpineol −82.0 −68.0 −80.3 −82.2 −77.6 −71.3\n(S)-α-Terpineol −76.9 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Oils as Antiviral Agents, Potential of Essential Oils to Treat SARS-CoV-2 Infection: An In-Silico Investigation\n\nAbstract\nEssential oils have shown promise as antiviral agents against several pathogenic viruses. In this work we hypothesized that essential oil components may interact with key protein targets of the 2019 severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2). A molecular docking analysis was carried out using 171 essential oil components with SARS-CoV-2 main protease (SARS-CoV-2 Mpro), SARS-CoV-2 endoribonucleoase (SARS-CoV-2 Nsp15/NendoU), SARS-CoV-2 ADP-ribose-1″-phosphatase (SARS-CoV-2 ADRP), SARS-CoV-2 RNA-dependent RNA polymerase (SARS-CoV-2 RdRp), the binding domain of the SARS-CoV-2 spike protein (SARS-CoV-2 rS), and human angiotensin−converting enzyme (hACE2). The compound with the best normalized docking score to SARS-CoV-2 Mpro was the sesquiterpene hydrocarbon (E)-β-farnesene. The best docking ligands for SARS−CoV Nsp15/NendoU were (E,E)-α-farnesene, (E)-β-farnesene, and (E,E)−farnesol. (E,E)−Farnesol showed the most exothermic docking to SARS-CoV-2 ADRP. Unfortunately, the docking energies of (E,E)−α-farnesene, (E)-β-farnesene, and (E,E)−farnesol with SARS-CoV-2 targets were relatively weak compared to docking energies with other proteins and are, therefore, unlikely to interact with the virus targets. However, essential oil components may act synergistically, essential oils may potentiate other antiviral agents, or they may provide some relief of COVID-19 symptoms.\n\n1. Introduction\nThe 2019 severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) is a newly emerging respiratory illness. The epidemic started in December 2019 in Wuhan, China, and has rapidly spread throughout China and the world and is now a global pandemic. SARS-CoV-2 can be efficiently transmitted among humans and has shown a high degree of morbidity and mortality [1,2]. As of April 20, 2020, the worldwide number of infected individuals was 2,544,792, with as many as 175,694 deaths [3]. There are currently no approved vaccines available for the prevention of SARS-CoV-2 infection and only just recently, remdesivir has received “emergency use authorization” for treatment of COVID-19 in the United States; therefore, there is an urgent demand for potential chemotherapeutic agents to treat this disease.\nEssential oils have been screened against several pathogenic viruses (Table 1), including influenza and other respiratory viral infections. Influenza is an infectious respiratory disease caused by one of three types of influenza viruses, type A, type B, or type C [4]. The most significant in terms of human morbidity and mortality is influenza virus type A, which is found in several bird and mammal species [5]. Several different serotypes of influenza type A have caused global flu pandemics [6]: H1N1, which caused the Spanish flu in 1918 (40–50 million deaths worldwide) [7] and the swine flu in 2009 [8]; the Asian flu of 1957–1958 (ca. 1.5 million deaths worldwide) was caused by influenza A H2N2 [8]; serotype H3N2 caused the Hong Kong flu in 1968 [9]; and H5N1, which caused the bird flu in 2004 [10]. Influenza virus type B, however, is largely confined to human hosts [11].\nOne study evaluated the in vitro antiviral effect against influenza type A (H1N1) of commercial essential oils that included cinnamon (Cinnamomum zeylanicum), bergamot (Citrus bergamia), lemongrass (Cymbopogon flexuosus), thyme (Thymus vulgaris), and lavender (Lavandula angustifolia). The oils were tested in the liquid phase at a concentration of 0.3% and in the vapor phase. The oils of cinnamon, bergamot, thyme, and lemongrass displayed 100% inhibition of H1N1 in the liquid phase, while the inhibition for lavender essential oil was 85%. However, in the vapor phase, 100% inhibition was observed only for cinnamon leaf essential oil after 30 min of exposure. The bergamot, lemongrass, thyme, and lavender essential oils displayed inhibition rates of 95%, 90%, 70%, and 80%, respectively [12].\nCinnamomum zeylanicum leaf oil is characterized by eugenol (75–85%), followed by smaller amounts of linalool (1.6–8.5%), and benzyl benzoate (0.1–8.3%) [13,14,15]. Bergamot oil is rich in limonene (23–55%), linalool (2–37%), and linalyl acetate (12–41%), with lesser quantities of β-pinene (up to 10%) and γ-terpinene (up to 10%) [16,17,18,19,20]. Geranial (48–54%) and neral (29–33%) have been reported as the major components of C. flexuosus, but many chemotypes, cultivars, and variants have been reported for C. flexuosus [21,22].\nIn the literature, there have been at least 20 different chemotypes identified for thyme essential oil. The “typical” thyme essential oil presents a thymol content of 45% (range 31–50%), with significant concentrations of p-cymene (0.1–26.6%, average = 15.6%) and γ-terpinene (up to 22.8%, average = 9.3%). In addition, there are several other chemotypes of T. vulgaris rich in thymol and/or carvacrol [23]. Thymol has been identified as an anti-influenza agent against influenza type A and parainfluenza type 3 virus [24,25]. Lavandula angustifolia essential oil is rich in linalyl acetate (37.0–43.6%), linalool (19.7–39.1%), geraniol (up to 9.3%), β-caryophyllene (up to 5.1%), terpinen-4-ol (up to 14.9%), lavandulyl acetate (up to 5.5%), and borneol (up to 6.4%) [26,27,28,29].\nAnother essential oil with notable anti-influenza effects is tea tree, which is extracted from the leaves of Melaleuca alternifolia (Myrtaceae). Commercial tea tree oil is composed of terpinen-4-ol (30–48%), γ-terpinene (10–28%), α-terpinene (5–13%), 1,8-cineole (up to 15%), terpinolene (1.5–5%), p-cymene (0.5–12%), α-pinene (1–6%), and α-terpineol (1.5–8%) [30]. Tea tree oil showed 100% inhibition of influenza type A (H1N1) virus at 0.01% concentration and a median inhibitory concentration (IC50) of 6 μg/mL [31,32]. In addition, 30 min exposure of type A (H11N9) virus to tea tree oil vapor caused 100% inhibition [33]. The tea tree oil components, terpinen-4-ol, terpinolene, and α-terpineol, have shown anti-influenza virus activity against type A (H1N1), with IC50 values of 25, 12, and 250 μg/mL, respectively. α-Terpinene, γ-terpinene, and p-cymene were inactive, however [31].\nAvian influenza viruses (H5N1) exhibit both high and low virulence in numerous mammalian species, highlighting the connection between the route of inoculation and virus pathogenicity [34]. Since 2003, there have been over 600 documented cases of human infection with H5N1 viruses, with most cases among young, previously healthy individuals [35]. The essential oils extracted from Citrus reshni leaves and peel (unripe and ripe fruits) were tested against H5N1 virus by plaque reduction assay. The oils showed moderate inhibition of the H5N1 virus at a concentration of 2.5 μL/mL. Sabinene (40.5%), linalool (23.3%), and terpinen-4-ol (8.3%) were the main constituents in the leaf oil while limonene (82.4%, 91.6%) was the main compound in the fruit peel essential oils (unripe and ripe, respectively) [36].\nThe essential oil of leaves of Fortunella margarita is rich in the sesquiterpenoids β-eudesmol (28.3%), α-muurolene (10.3%), β-gurjunene (10.0%), γ-eudesmol (8.4%), and γ-muurolene (6.6%) while the essential oil extracted from the fruits showed monterpenoids as the main components, α-terpineol (55.5%), carvone (5.7%), and carveol (5.5%). Both samples were tested for antiviral activity against avian influenza (H5N1) virus, and the obtained results revealed that the fruit essential oil was more effective (80% virus inhibition by the MTT (3-(4,5-dimethylthiazol-2-yl)-2,5-diphenyltetrazolium bromide) assay using Madin−Darby canine kidney (MDCK) cells for virus propagation). The IC50 values obtained for the leaf and fruit essential oils were 38.89 and 6.77 μg/mL, respectively [53].\nDengue fever, a mosquito−borne disease, is caused by dengue virus (DENV) which includes four major serotypes (DENV-1, -2, -3, and -4). Some serotypes cause more severe diseases than others; severe dengue is associated with secondary infections by a different serotype. Dengue disease is a major public health problem in developing tropical countries and has being continuously spreading to new geographical areas [92]. The essential oils of two species of Lippia were assayed against four dengue serotypes (DENV-1, DENV-2, DENV-3, DENV-4) [61]. The IC50 values for Lippia alba oil, rich in carvone (39.7%), limonene (30.6%), and bicyclosesquiphellandrene (8.9%), were between 0.4 and 32.6 μg/mL. However, the Lippia citrodora essential oil, composed of geranial (18.9%), neral (15.6%), limonene (10.7%), and 1,8-cineole (5.0%), showed the best activity, with IC50 values varying from 1.9 to 33.7 μg/mL. No viral inhibitory effect was observed by addition of the essential oil after virus adsorption; the inhibitory effect of the essential oil seemed to cause direct virus inactivation before adsorption on the host cell.\nThe essential oils of seven aromatic plants from Córdoba, San Luis, and San Juan provinces (Argentina) were screened for cytotoxicity and in vitro inhibitory activity against dengue virus type 2 (DENV−2) [38]. The oils of Jungia polita and Buddleja cordobensis were composed of caryophyllene oxide (9.18%, 32.1%) and β-caryophyllene (8.13%, 16.5%) as the major compounds. However, these oils displayed different IC50 values (86.4 and 39.8 μg/mL, respectively). The other samples were composed mostly of monoterpenes and displayed lower activity, except Pectis odorata oil, which presented limonene (50.2%), neral (27.2%), and geranial (23.6%) as the major compounds and an IC50 value of 39.6 μg/mL. In addition, the essential oils of Artemisia mendozana, rich in camphor (22.4%), artemisole (11.7%), and artemisia alcohol (10.8%); Gailardia megapotamica composed of β-pinene (35.5%), spathulenol (10.7%), and germacrene D (6.8%); and Heterothalamus alienus characterized by β-pinene (35.5%), spathulenol (10.7%), and germacrene D (6.8%), showed an average IC50 value of 130.63 μg/mL.\nYellow fever (YF), caused by yellow fever virus (YFV), has historically been considered one of the most dangerous infectious diseases. YFV is transmitted to humans via mosquitoes of the Haemogogus, Sabethes, and Aedes genera. Annually, there are approximately 80,000–200,000 YFV cases worldwide, with a case fatality rate (CFR) ranging from 20–60% [93,94]. Essential oils of Lippia species and their main compounds have been tested against yellow fever virus (YFV) in Vero cells. The oil of Lippia origanoides showed carvacrol (44.0%), thymol (15.0%), and γ-terpinene (10.0%) as the main compounds and displayed 100% inhibition at a concentration of 11.1 μg/mL [43]. However, in the same study, the oil of L. alba displayed 100% inhibition at a concentration of 100.0 μg/mL. The major compounds were carvone (51.0%), limonene (33.0%), and bicyclosesquiphellandrene (7.0%). The essential oil of L. alba with a similar chemical composition, carvone (39.7%), limonene (30.6%), and bicyclosesquiphellandrene (8.9%), displayed an IC50 value of 4.3 μg/mL against YFV when tested in Vero cells using the MTT assay [62]. The essential oil of L. citriodora, dominated by geranial (18.9%), neral (15.6%), and limonene (10.7%), did not display a statistical difference in comparison to citral, with IC50 values of 19.4 and 17.6 μg/mL, respectively [62].\nIn addition to essential oils, several individual essential oil components have been screened for antiviral activity (Table 2).\nBecause of the activities of several essential oils and essential oil components against human pathogenic viruses, we hypothesized that essential oil components may be potentially useful as antiviral agents against SARS-CoV-2. In this work, we carried out a molecular docking analysis of the major components of essential oils that exhibit antiviral activity (Table 1 and Table 2) with known SARS-CoV-2 protein targets.\n\n2. Results and Discussion\nSeveral proteins have been identified for severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2), which may serve as potential targets for chemotherapeutic intervention in coronavirus disease 2019 (COVID-19). These protein targets include SARS-CoV-2 main protease (SARS-CoV-2 Mpro), SARS-CoV-2 endoribonucleoase (SARS-CoV-2 Nsp15/NendoU), SARS-CoV-2 ADP−ribose−1″−phosphatase (SARS-CoV-2 ADRP), SARS-CoV-2 RNA-dependent RNA polymerase (SARS-CoV-2 RdRp), the binding domain of the SARS-CoV-2 spike protein (SARS-CoV-2 rS), and human angiotensin−converting enzyme (hACE2). There have already been several molecular docking studies on these macromolecular targets. Several groups have carried out molecular docking of natural product libraries with SARS-CoV-2 Mpro [102,103,104,105]. Additionally, commercially available drugs have also been examined using in silico methods [106,107].\nA molecular docking study was carried out with 171 essential oil components with SARS-CoV-2 Mpro (PDB: 5R7Z, 5R80, 5R81, 5R82, 5R83, 5R84, 6LU7, 6M03, and 6Y84), SARS-CoV-2 Nsp15/NendoU (PDB: 6VWW, 6W01, and 6W02), SARS-CoV-2 rS (PDB: 6M0J, 6M17, 6VX1, and 6VW1), and SARS-CoV-2 RdRp (PDB: 6M71). The best docking scores are summarized in Table 3.\nThe main protease, SARS-CoV-2 Mpro, is a cysteine protease that is essential for processing the polyproteins that are translated from the coronavirus RNA [108]. The substrate binding site of the enzyme is a cleft flanked by Gln189, Met49, Pro168, Glu166 and His41; the active site is Cys145 and His41. The compound with the best normalized docking score to SARS-CoV-2 Mpro was the sesquiterpene hydrocarbon (E)-β-farnesene (DSnorm = −115.4 kJ/mol). Other essential oil components showing good docking scores with SARS-CoV-2 Mpro were (E,E)-α-farnesene (DSnorm = −115.0 kJ/mol), (E,E)-farnesol (DSnorm = −112.4 kJ/mol), and (E)-nerolidol (DSnorm = −110.7 kJ/mol). The sesquiterpene hydrocarbons (E,E)-α-farnesene and (E)-β-farnesene occupy the substrate binding site, flanked by Gln189, Arg188, Met165, His41, and Asp 187 (Figure 1). The lowest-energy docked poses of both (E,E)-farnesol and (E)-nerolidol showed hydrogen bonding of the alcohol moiety to Gln192 and Thr190 and, in the case of (E)-nerolidol, also with GLN189 and ARG188 (Figure 2).\nNon-structural protein 15 (Nsp15) of SARS-CoV-2 is an endoribonuclease that preferentially cleaves RNA at uridylate. Furthermore, it has been shown that SARS-CoV Nsp15/NendoU is required for successful viral infection [109]. The best docking ligands for SARS-CoV Nsp15/NendoU are (E,E)-α-farnesene (DSnorm = −107.5 kJ/mol), (E)-β-farnesene (DSnorm = −105.0 kJ/mol), (E,E)-farnesol (DSnorm = −104.6 kJ/mol), and (E)-nerolidol (DSnorm = −101.6 kJ/mol). All of these sesquiterpenoids preferentially docked into a binding site formed by amino acid residues Gln347, Ile328, Val276, Ser274, Thr275, Ser329, Asn74, Asn75, Glu327, and Lys71 (Figure 3). In addition to van der Waals interactions, (E,E)-farnesol showed hydrogen-bonding interactions with Ser329 and Glu327, while (E)-nerolidol hydrogen bonded with Asn75 and Lys71 (Figure 3). Unfortunately, the docking scores for these ligands as well as the scores of the other essential oil components with this protein are too low for it to be considered a viable target (see Table 3).\nADP ribose phosphatase (ADRP) serves to convert ADP-ribose 1″-monophosphate (Appr-1″-p) to ADP-ribose (Appr), which serves to regulate virus replication [110]. This enzyme may be dispensable in SARS-CoV-2, however [111]. Nevertheless, (E,E)-farnesol showed the most exothermic docking to SARS-CoV-2 ADRP with DSnorm = −121.4 kJ/mol. The binding site in SARS-CoV-2 ADRP is surrounded by Phe132, Asn40, Ile131, Ala38, and Ala39, with hydrogen-bonded interactions between the ligand alcohol and Asn40 (Figure 4). Additional essential oil components with good docking scores with SARS-CoV-2 ADRP include the sesquiterpene hydrocarbons (E)-β-farnesene (DSnorm = −116.3 kJ/mol), (E,E)-α-farnesene (DSnorm = −114.2 kJ/mol), β-sesquiphellandrene (DSnorm = −115.7 kJ/mol), and α-zingiberene (DSnorm = −115.4 kJ/mol); the diterpenoids phytol (DSnorm = −118.9 kJ/mol) and phytone (DSnorm = −116.9 kJ/mol); and the phenylpropanoid eugenyl acetate (DSnorm = −115.4 kJ/mol). Not surprisingly, β-sesquiphellandrene and α-zingiberene adopted the same docking orientation in the binding site of the enzyme (Figure 5A). Similarly, phytol and phytone occupy the same location in the binding site (Figure 5B).\nRNA-dependent RNA polymerase catalyzes RNA replication from an RNA template and is an essential enzyme in RNA viruses. Because these enzymes are crucial in viral replication, they are viable targets in antiviral chemotherapy [112]. Molecular docking of essential oil components with SARS-CoV-2 RdRp showed only weak docking with this enzyme target (Table 3). The ligand with the best docking score was (E,E)-farnesol, with DSnorm = −89.6 kJ/mol.\nThe SARS-CoV-2 spike protein serves to attach to angiotensin-converting enzyme 2 (ACE2) of the human cell to be invaded. The interface between SARS-CoV-2 rS and human ACE2 would be a promising target to prevent binding of SARS-CoV-2 rS to human ACE2 [113,114]. The best docking ligands with human ACE2, i.e., normalized docking scores \u003c -100 kJ/mol (α-bulnesene, eremanthin, (E,E)-α-farnesene, (E)-β-farnesene, (E,E)-farnesol, (E)-nerolidol, β-sesquiphellandrene, and (Z)-spiroether), all show docking preference to a cavity removed from the interaction interface between the SARS-CoV-2 spike protein and ACE2 (Figure 6). This cavity is a pocket surrounded by residues Pro565, Leu95, Val209, Asn210, Leu91, Lys94, Glu208, and Glu564. Because of the remote location of docking with ACE2, it is predicted that interaction of essential oil components with ACE2 will not prevent protein–protein interaction between the SARS-CoV-2 spike protein and human ACE2.\nOn the other hand, the lowest energy poses of essential oil components showing the strongest docking (\u003c−80 kJ/mol; (E)-cinnamyl acetate, eremanthin, (E,E)-α-farnesene, (E)-β-farnesene, (E,E)-farnesol, and geranyl formate) with the binding domain of the SARS-CoV-2 spike protein do lie at the interface between the SARS-CoV-2 spike protein and human ACE2 (Figure 6). This docking site is a hydrophobic pocket formed by Tyr505, Tyr495, Asn501, Arg403, Tyr453, and Gly502. Unfortunately, the docking energies at this site are too weak and are unlikely, therefore, to disrupt binding between SARS-CoV-2 rS and human ACE2.\nIn order to compare docking scores of the essential oil components with other proteins, docking was also carried out with six randomly selected non-virus proteins: Bovine odorant binding protein (BtOBP, PDB: 1GT3), cruzain (PDB: 1ME3), torpedo acetylcholinesterase (TcAChE, PDB: 6G1U), Bacillus anthracis nicotinate mononucleotide adenylytransferase (BaNadD, PDB: 3HFJ), Russell’s viper phospholipase A2 (DrPLA2, PDB: 1FV0), and Escherichia coli l-aspartate aminotransferase (EcAspTA, PDB: 2Q7W). Docking scores for these proteins are summarized in Table 4.\nThe docking results of the essential oil components with the six randomly selected proteins indicate the best docking ligands to SARS-CoV-2 targets (i.e., (E,E)-α-farnesene, (E)-β-farnesene, and (E,E)-farnesol) have better docking energies with other proteins. These three sesquiterpenes have docking energies of −129.8, −122.7, and −133.0 kJ/mol with TcAChE, respectively, and −131.8, −131.8, and −135.6 kJ/mol, respectively, with BaNadD. Indeed, most of the essential oil ligands have better docking properties with one or more of the random proteins compared to the SARS-CoV-2 proteins.\nBased on the docking energies of essential oil components with key protein targets of SARS-CoV-2, the individual essential oil components cannot be considered viable chemotherapeutic agents for interaction with the SARS-CoV-2 target proteins. However, essential oils are complex mixtures of compounds and several essential oil components may act synergistically to inhibit the virus. Astani and co-workers have shown, for example, that the antiviral activity (HSV-1) of Eucalyptus oil is much greater than the major component 1,8-cineole, and that tea tree oil has a greater antiviral activity than its components terpinen-4-ol, γ-terpinene, and α-terpinene [52].\nSynergistic effects have also been observed between essential oils and synthetic antiviral agents. Civitelli and co-workers observed an antiviral synergism between Mentha suaveolens essential oil and acyclovir on HSV-1 [64]. Likewise, Melissa officinalis essential oil potentiated the activity of oseltamivir against avian influenza virus H9N2 [115]. Furthermore, essential oils are lipophilic and therefore may also serve to disintegrate viral membranes [116].\nOutside of antiviral activity, there may be some relief of symptoms of COVID-19 provided by essential oils. For example, linalool [117,118], β-caryophyllene [119,120], and 1,8-cineole [121,122] have both anti-inflammatory and antinociceptive activity; menthol [123,124], camphor [125,126], and thymol [127] have antitussive activities.\n\n3. Materials and Methods\n\n3.1. Bibliographic Search Criteria\nThe bibliographic research was performed using the databases Google Scholar, Pubmed, Science Direct, Medline, and Scopus. The keywords applied were “antiviral activity” and “essential oils”, “antiviral activity” and “volatile compounds”, and “essential oils” and “respiratory diseases”.\n\n3.2. Ligand Selection\nThe major components (\u003e5%) of essential oils and pure essential oil components that have been screened against human pathogenic viruses were selected. In the case where enantiomers are known to be natural products, both structures were selected. A total of 171 essential oil components were used in the virtual screening.\n\n3.3. Molecular Docking\nEach ligand structure was prepared using Spartan ’18 v. 1.4.4 (Wavefunction, Inc., Irvine, CA, USA). The lowest-energy conformations of the ligands were determined and used as starting structures in the molecular docking. This is particularly important to include all potential conformations in medium-sized rings where interconversion between conformations may be hindered (e.g., bicyclogermacrene, costunolide, curdione, germacrene D, germacrone, and α-humulene). A total of six protein targets of SARS-CoV-2 from the Protein Data Bank (PDB), represented by a total of 17 structures, were used in the molecular docking, including SARS-CoV-2 main protease (PDB: 5R7Z, 5R80, 5R81, 5R82, 5R83, 5R84, 6LU7, 6M03, and 6Y84), SARS-CoV-2 endoribonuclease (PDB: 6VWW), SARS-CoV-2 ADP ribose phosphatase (PDB: 6W01 and 6W02), SARS-CoV-2 RNA-dependent RNA polymerase (PDB: 6M71), SARS-CoV-2 spike protein binding domain (PDB: 6M0J, 6VX1, 6VW1, and 6M17), and the human angiotensin-converting enzyme (PDB: 6M0J, 6VX1, 6VW1, and 6M17). Molecular docking was carried out using Molegro Virtual Docker v. 6.0.1 (Aarhus, Denmark) as previously reported [128,129]. Briefly, a 15-Å radius sphere centered on the binding sites of each protein structure in order to permit each ligand to search. In the case of the spike protein and human ACE2, the docking sphere was located at the interface between the spike protein and ACE2. In one case, ACE2 was removed and docking was carried out with the spike protein, and in the other case, the spike protein was removed and docking was carried out with ACE2. Standard protonation states of each protein, based on neutral pH, were used, and charges were assigned based on standard templates as part of the Molegro Virtual Docker program. Each protein was used as a rigid model without protein relaxation. Flexible-ligand models were used in the docking optimizations. Different orientations of the ligands were searched and ranked based on their “rerank” energy scores. A minimum of 100 runs for each ligand was carried out. In analyzing the docking scores, we accounted for the recognized bias due to molecular weight [130,131,132] using the scheme: DSnorm = 7.2 × Edock/MW⅓, where DSnorm is the normalized docking score, Edock is the MolDock re-rank score, MW is the molecular weight, and 7.2 is a scaling constant to ensure the average DSnorm values are comparable to those of Edock [128]. The best docking results are summarized in Table 1.\n\n4. Conclusions\nA molecular docking analysis was carried out using 171 essential oil components with the SARS-CoV-2 main protease (SARS-CoV-2 Mpro), SARS-CoV-2 endoribonucleoase (SARS-CoV-2 Nsp15/NendoU), SARS-CoV-2 ADP-ribose-1″-phosphatase (SARS-CoV-2 ADRP), SARS-CoV-2 RNA-dependent RNA polymerase (SARS-CoV-2 RdRp), the binding domain of the SARS-CoV-2 spike protein (SARS-CoV-2 rS), and human angiotensin-converting enzyme (hACE2). The best docking ligands for the SARS-CoV target proteins were (E,E)-α-farnesene, (E)-β-farnesene, and (E,E)-farnesol. The docking energies were relatively weak, however, and are unlikely to interact with the virus targets. However, essential oil components may act synergistically, essential oils may potentiate other antiviral agents, or they may provide some relief of COVID-19 symptoms.\n\nAcknowledgments\nW.N.S. participated in this work as part of the activities of the Aromatic Plant Research Center 237 (APRC, https://aromaticplant.org/).\n\nAuthor Contributions\nConceptualization, J.K.R.d.S., K.G.B., and W.N.S.; methodology, J.K.R.d.S., K.G.B., and W.N.S.; formal analysis, W.N.S.; investigation, J.K.R.d.S., P.L.B.F., K.G.B., and W.N.S.; data curation, W.N.S.; writing—original draft preparation, J.K.R.d.S. and W.N.S.; writing—review and editing, J.K.R.d.S., P.L.B.F., K.G.B., and W.N.S.; project administration, W.N.S.; All authors have read and agreed to the published version of the manuscript.\n\nFunding\nThis research received no external funding.\n\nConflicts of Interest\nThe authors declare no conflict of interest. Abbreviations\nAdeno Adenovirus\nAIV Avian influenza virus\nBaNadD Bacillus anthracis nicotinate mononucleotide adenylytransferase\nBtOBP Bovine odorant binding protein\nCOVID-19 Coronavirus disease 2019\nCox B1 Coxsackie B1 virus\nDENV-1 Dengue virus serotype 1\nDENV-2 Dengue virus serotype 2\nDENV-3 Dengue virus serotype 3\nDENV-4 Dengue virus serotype 4\nDrPLA2 Russell’s viper phospholipase A2\nDSnorm Normalized docking score\nEcAspTA Esherichia coli L-aspartate aminotransferase\nECHO 9 Echovirus 9\nhACE2 Human angiotensin-converting enzyme\nHeLa Human cervical tumor cells\nHEp-2 Human epithelial type 2 cells\nHRSV Human respiratory syncytial virus\nHSV-1 Herpes simplex virus 1\nHSV-2 Herpes simplex virus 2\nIC50 Median inhibitory concentration\nJUNV Junin virus\nMDCK Madin-Darby canine kidney cells\nMTT 3-(4,5-dimethylthiazol-2-yl)-2,5-diphenyltetrazolium bromide\nPCR Polymerase chain reaction\nPDB Protein data bank\nPolio 1 Poliomyelitis virus 1\nRC-37 African green monkey kidney cells\nSARS-CoV-2 2019 severe acute respiratory syndrome coronavirus 2\nTcAChE Torpedo acetylcholinesterase\nVero African green monkey kidney cells\nYFV Yellow fever virus\n\nFigure 1 Lowest-energy docked poses of (E)-β-farnesene and (E,E)-α-farnesene with the SARS-CoV-2 main protease (PDB: 6LU7). (A) Ribbon structure of the enzyme and (E)-β-farnesene. (B) Solid structure of the enzyme showing (E)-β-farnesene in the binding cleft. (C) Amino acid residues in proximity to the docked (E)-β-farnesene. (D) Lowest-energy docked pose of (E,E)-α-farnesene in the enzyme binding site.\nFigure 2 Lowest-energy docked poses of (E,E)-farnesol and (E)-nerolidol with the SARS-CoV-2 main protease (PDB: 6Y84). (A) Ribbon structure of the enzyme and (E,E)-farnesol (magenta) and (E)-nerolidol (orange). (B) Solid structure of the enzyme showing (E,E)-farnesol (magenta) and (E)-nerolidol (orange) in the binding cleft. (C) Important interactions of amino acid residues with (E,E)-farnesol. (D) Important interactions of amino acid residues with (E)-nerolidol. Hydrogen bonds are indicated with blue dashed lines.\nFigure 3 Lowest-energy docked poses of (E,E)-α-farnesene, (E)-β-farnesene, (E,E)-farnesol, and (E)-nerolidol with SARS-CoV-2 endoribonuclease (PDB: 6VWW). (A) Ribbon structure of the enzyme and (E,E)-α-farnesene (green), (E)-β-farnesene (aqua), (E,E)-farnesol (magenta), and (E)-nerolidol (orange). (B) Solid structure of the enzyme showing (E,E)-α-farnesene (green), (E)-β-farnesene (aqua), (E,E)-farnesol (magenta), and (E)-nerolidol (orange) in the binding cleft. (C) Lowest-energy docked pose of (E,E)-α-farnesene in the binding site. (D) Lowest-energy docked pose of (E)-β-farnesene in the binding site. (E) Lowest-energy docked pose of (E,E)-farnesol in the binding site. (F) Lowest-energy docked pose of (E)-nerolidol in the binding site. Hydrogen bonds are indicated with blue dashed lines.\nFigure 4 Lowest-energy docked pose of (E,E)-farnesol with SARS-CoV-2 ADP ribose phosphatase (PDB: 6W02). (A) Ribbon structure of the enzyme and the docked ligand. (B) Solid structure of the enzyme showing (E,E)-farnesol in the binding cleft. (C) Amino acid residues in proximity to the docked (E,E)-farnesol (hydrogen bonds are indicated with blue dashed lines).\nFigure 5 Lowest-energy docked poses of β-sesquiphellandrene, α-zingiberene, phytol, and phytone with SARS-CoV-2 ADP ribose phosphatase (PDB: 6W02). (A) Ribbon structure of the enzyme with β-sesquiphellandrene (brown) and α-zingiberene (yellow). (B) Ribbon structure of the enzyme with phytol (green) and phytone (red).\nFigure 6 Lowest-energy docked ligands with the binding domain of SARS-CoV-2 spike protein and human angiotensin-converting enzyme 2 (ACE2) (PDB: 6M17).\nTable 1 Essential oils showing antiviral activity.\nEssential Oil Major Components Assay IC50 (μg/mL) Reference\nAloysia gratissima (Gillies \u0026 Hook.) Tronc. caryophyllene oxide (15.8%), guaiol (17.4%) a, chrysanthenyl acetate (5.6%), and limonene oxide (5.3%) Plaque reduction assay (Vero cells), HSV-1 65.0 [37]\nAloysia triphylla Royle α-thujone (22.9%), cis−carveol (17.5%), carvone (13.2%), and limonene (12.7%) Plaque reduction assay (Vero cells), HSV-1 \u003e250 [38]\nArtemisia arborescens L. camphor (35.7%), β-thujone (24.0%), and chamazulene (7.7%) Plaque reduction assay (Vero cells), HSV-1 25% inhibition at 100 μg/mL [39]\nArtemisia arborescens L. Artemisia arborescens L. β-thujone (45.0%), camphor (6.8%), and chamazulene (22.7%) c Plaque reduction assay (Vero cells), HSV-1, HSV-2 2.4, 4.1 [40]\nArtemisia douglasiana Besser α-thujone (68.3%) and β-thujone (7.5%) Plaque reduction assay (Vero cells), HSV-1 83 [37]\nArtemisia kermanensis Podlech (syn. Seriphidium kermanense (Podlech) K. Bremer \u0026 Humphries α-thujone (13.8%), camphor (10.2%), and β-thujone (6.2%) Plaque reduction assay (Vero cells), HSV-1 40 [41]\nArtemisia mendozana DC. camphor (22.4%), artemiseole (11.7%), artemisia alcohol (10.8%), and borneol (7.2%) Plaque reduction assay, DENV−2, JUNV and HSV-1 129.3, 178.6, and 153.7 [38]\nArtemisia princeps Pamp. borneol (12.1%), α-thujone (8.7%), τ−cadinol, (6.7%), and 1,8-cineole (6.2%) Plaque reduction assay, murine norovirus−1 64% inhibition at 0.01% [42]\nPlaque reduction assay, feline calicivirus−F9 48% inhibition at 0.1%\nArtemisia vulgaris L. α-thujone (38.1%), β-thujone (10.6%), and 1,8-cineole (8.8%) Virus yield assay (Vero cells), yellow fever virus (YFV) 100 μg/mL (100% inhibition) [43]\nAyapana triplinervis (Vahl) R.M. King \u0026 H. Rob. thymohydroquinone dimethyl ether Plaque reduction assay (A549 cells), Zika virus 38.0 [44]\nBuddleja cordobensis Griseb. caryophyllene oxide (32.1%), β-caryophyllene (16.5%), and α-copaene (8.5%) Plaque reduction assay, DENV−2, JUNV and HSV-1 86.4, 39.0, and 54.1 [38]\nCedrus libani A. Rich. himachalol (22.5%), β-himachalene (21.9%), and α-himachalene (10.5%) Cytopathic effect (CPE) on Vero cells, HSV-1 440 [45]\nCinnamomum zeylanicum Blume (syn. Cinnamomum verum J. Presl) eugenol (75–85%), linalool (1.6−8.5%), (E)−cinnamaldehyde (0.6−1.5%), (E)−cinnamyl acetate (0.7–2.6%), β-caryophyllene (0.5–6.7%), eugenyl acetate (0.1–2.9%), and benzyl benzoate (0.1–8.3%) Influenza type A (H1N1) [46]\nCinnamomum zeylanicum Blume (syn. Cinnamomum verum J. Presl) (E)−cinnamaldehyde (63.9%), eugenol (7.0%), and (E)−cinnamyl acetate (5.1%) c Plaque reduction assay (HeLa cells), HSV-2 82 [47]\nCitrus × bergamia Risso \u0026 Poit. limonene (23–55%), linalool (2–37%), linalyl acetate (12–41%), β-pinene (up to 10%), and γ-terpinene (up to 10%) Influenza virus type A H1N1 100% inhibition at 0.3% [46]\nCitrus limonum Risso limonene (54.6%), γ-terpinene (19.1%), and β-pinene (14.5%) d Plaque reduction assay (Vero cells), HSV-1 2500 [48]\nCitrus reshni Hort ex Tan. (leaf EO) sabinene (40.5%), linalool (23.3%), and terpinen-4-ol (8.3%) Plaque reduction assay, influenza A virus H5N1 19.4% inhibition at 0.1 μL/mL [36]\nCitrus reshni Hort ex Tan. (unripe fruit peel EO) limonene (82.4%) and linalool (7.2%) Plaque reduction assay, influenza A virus H5N1 61.5% inhibition at 1.5 μL/mL [36]\nCitrus reshni Hort ex Tan. (ripe fruit peel EO) limonene (91.6%) Plaque reduction assay, influenza A virus H5N1 50% inhibition at 1.5 μL/mL [36]\nCupressus sempervirens L. α-pinene (51.9%) and δ-3-carene (24.9%) c Plaque reduction assay (Vero cells), HSV-1 6600 [48]\nCymbopogon citratus (DC.) Stapf geranial (40.2%), neral (30.6%), and geraniol (6.7%) c Plaque reduction assay (Vero cells), HSV-1 91 [48]\nCymbopogon flexuosus (Nees) Will. Watson geranial (48–54%) and neral (29–33%) Influenza virus type A (H1N1) [46]\nCynanchum stauntonii (Decne.) Schltr. ex H. Lév. (2E,4E)-decadienal (23.0%), γ-nonalactone (4.2%), 5-pentyl-2(3H)−furanone (3.8%), and 3-isopropyl-1-pentanol (3.5%) Influenza type A (H1N1) 64 [46]\nDysphania ambrosioides (L.) Mosyakin \u0026 Clemants cis-ascaridole (60.7%) and m-cymene (22.2%) Plaque reduction assay, Coxsackie virus B4 21.75 [49]\nEucalyptus astringens (Maiden) Maiden 1,8-cineole (42.0%), α-pinene (22.0%), and trans−pinocarveol (7.0%) Vero cells, Coxsakie virus B3 13.0 [50]\nEucalyptus bicostata Maiden, Blakely \u0026 Simmonds 1,8-cineole (68.0%), globulol (5.4%), and trans−pinocarveol (4.6%) Vero cells, Coxsakie virus B3 13.6 [50]\nEucalyptus caesia Benth. 1,8-cineole (40.2%), p-cymene (14.1%), γ-terpinene (12.4%), α-pinene (7.7%), and terpinen-4-ol (5.6%) Plaque reduction assay (Vero cells), HSV-1 70 [41]\nEucalyptus camaldulensis Dehnh. α-terpinene (26.3%), α-terpineol (9.1%), and camphene (8.5%) e Plaque reduction assay, Rotavirus Wa strain 50% inhibition at 10% EO concentration [51]\nEucalyptus camaldulensis Dehnh. α-terpinene (26.3%), α-terpineol (9.1%), and camphene (8.5%) e Plaque reduction assay, Coxsackie virus B4 53.3% at 10% EO concentration [51]\nEucalyptus camaldulensis Dehnh. α-terpinene (26.3%), α-terpineol (9.1%), and camphene (8.5%) e Plaque reduction assay, HSV-1 90% at 10% EO concentration [51]\nEucalyptus camaldulensis Dehnh. α-terpinene (26.3%), α-terpineol (9.1%), and camphene (8.5%) e Plaque reduction assay, adenovirus type 7 0% at 10% EO concentration [51]\nEucalyptus cinereal F. Muell. ex Benth. 1,8-cineole (70.4%), α-pinene (4.5%), and limonene (3.7%) Vero cells, Coxsakie virus B3 13.0 [50]\nEucalyptus globulus Labill. 1,8-cineole (63.8%) and α-pinene (14.0%) f Plaque reduction assay (Vero cells), HSV-1 1700 [48]\nEucalyptus globulus Labill. 1,8-cineole (63.8%) and α-pinene (14.0%) f Plaque reduction assay (RC-37 cells), HSV-1 55.0 [52]\nEucalyptus lehmannii (Schauer) Benth. 1,8-cineole (59.6%), α-pinene (17.6%), and α-terpineol (8.7%) Vero cells, Coxsakie virus B3 11.5 [50]\nEucalyptus leucoxylon F. Muell. 1,8-cineole (59.2%), α-pinene (7.8%), and α-terpineol (4.3%) Vero cells, Coxsakie virus B3 8.1 [50]\nEucalyptus maidenii F. Muell. 1,8-cineole (57.8%), p-cymene (7.4%), and α-pinene (7.3%) Vero cells, Coxsakie virus B3 14.5 [50]\nEucalyptus odorata Behr cryptone (20.9%), p-cymene (16.7%), phellandral (6.6%), and cuminal (6.6%) Vero cells, Coxsakie virus B3 19.2 [50]\nEucalyptus sideroxylon A. Cunn. ex Woolls 1,8-cineole (69.2%), α-pinene (6.9%), and α-terpineol (5.4%) Vero cells, Coxsakie virus B3 12.3 [50]\nEupatorium patens D. Don ex Hook. \u0026 Arn. germacrene D (36.2%), β-caryophyllene (14.1%), and bicyclogermacrene (7.0%) Plaque reduction assay (Vero cells), HSV-1 125 [37]\nFortunella margarita (Lour.) Swingle (leaf EO) α-terpineol (55.5%), carvone (5.7%), carveol (5.5%), γ-muurolene (5.5%), and citronellal (5.0%) MTT assay, reasserted avian influenza A virus, H5N1 6.77 [53]\nFortunella margarita (Lour.) Swingle (fruit EO) β-eudesmol (28.3%), α-muurolene (10.3%), β-gurjunene (10.0%), γ-eudesmol (8.4%), and γ-muurolene (6.6%) MTT assay, reasserted avian influenza A virus, H5N1 38.89 [53]\nGaillardia megapotamica (Spreng.) Baker β-pinene (24.2%), (Z)-β-ocimene (16.5%), α-pinene (7.7%), limonene (7.5%), and β-caryophyllene (6.7%) Plaque reduction assay, DENV−2, JUNV and HSV-1 140.6, 49.8, and 99.1 [38]\nHeterothalamus alienus (Spreng.) Kuntze β-pinene (35.5%), spathulenol (10.7%), and germacrene D (6.8%) Plaque reduction assay DENV−2, JUNV and HSV-1 122.3, 44.2 and 148.4 [38]\nHeterotheca latifolia Buckley borneol (40.0%), camphor (24.3%), and limonene (5.1%) Plaque reduction assay (Vero cells), HSV-1 \u003e150 [37]\nHouttuynia cordata Thunb. decanal (3.4−8.9%), decanol (up to 7.0%), 2−undecanone (23.0−36.1%), decanoic acid (1.4−6.3%), dodecanal (up to 7.3%), and 2−tridecanone (2.6−5.6%) Influenza type A (H1N1) 48 [54]\nHyptis mutabilis (Rich.) Briq. fenchone (17.1%), 1,8-cineole (12.6%), β-caryophyllene (10.9%), bicyclogermacrene (8.7%), and germacrene D (6.2%) Plaque reduction assay (Vero cells), HSV-2 (Human Herpesvirus type 1) 79.01 [55]\nHyptis mutabilis (Rich.) Briq. germacrene D (15.1%), β-caryophyllene (13.3%), curzerene (13.3%), and bicyclogermacrene (13.2%) Plaque reduction assay (Vero cells) \u003e150 [37]\nHyssopus officinalis L. cis−pinocamphone (40.1%), trans−pinocamphone (13.3%), β-pinene (10.7%), and β-phellandrene (5.3%) c Plaque reduction assay (RC-37 cells), HSV-1 1 [56]\nHyssopus officinalis L. cis−pinocamphone (40.1%), trans−pinocamphone (13.3%), β-pinene (10.7%), and β-phellandrene (5.3%) c Plaque reduction assay (RC-37 cells), HSV-2 6 [57]\nIllicium verum Hook. f. (E)−anethole (90.5%) c Plaque reduction assay (RC-37 cells), HSV-1 40 [58]\nIllicium verum Hook. f. (E)−anethole (90.5%) c Plaque reduction assay (RC-37 cells), HSV-1 1 [59]\nIllicium verum Hook. f. (E)−anethole (90.5%) c Plaque reduction assay (RC-37 cells), HSV-2 30 [57]\nJungia polita Griseb. caryophyllene oxide (9.2%) and β-caryophyllene (8.1%) Plaque reduction assay DENV−2, JUNV and HSV-1 39.8, 134.2 and 136.4 [38]\nJuniperus communis L. α-pinene (46.7%), myrcene (15.0%), sabinene (13.2%), and limonene (7.0%) c Plaque reduction assay (Vero cells), HSV-1 \u003e10000 [48]\nLavandula angustifolia Mill. linalyl acetate (37.0−43.6%), linalool (19.7−39.1%), geraniol (up to 9.3%), β-caryophyllene (up to 5.1%), terpinene−4−ol (up to 14.9%), lavandulol (up to 1.5%), lavandulyl acetate (up to 5.5%), 1,8-cineole (up to 4.1%), and borneol (up to 6.4%) 85% in vitro inhibition of influenza type A (H1N1) [46]\nLavandula latifolia Medik. linalool (31.9%), 1,8-cineole (18.8%), and borneol (10.1%) g Plaque reduction assay (Vero cells), HSV-1 2200 [48]\nLepechinia salviifolia (Kunth) Epling camphor (10.3%), limonene (9.7%), p−mentha−1(7),8−diene (7.4%), α-pinene (6.9%), and γ-terpinene (6.7%) Plaque reduction assay (Vero cells), HSV-1, HSV-2 68.8, 81.9 [55]\nLepechinia vulcanicola J.R.I. Wood limonene (18.9%), germacrene D (10.4%), 1−octen−3−ol (8.8%), β-caryophyllene (8.7%), and α-pinene (8.2%) Plaque reduction assay (Vero cells), HSV-1, HSV-2 112, 68.9 [55]\nLeptospermum scoparium J.R. Forst. \u0026 G. Forst. calamene (16.0%), leptospermone (14.5%), δ−cadinene (6.1%), flavesone (4.5%), viridiflorene (4.4%), and isoleptospermone (3.9%) Plaque reduction assay (RC-37 cells), HSV-1, HSV-2 0.96, 0.58 [60]\nLippia alba (Mill.) N.E. Br. ex Britton \u0026 P. Wilson carvone (51.0%), Limonene (33%), and bicyclosesquiphellandrene (7.0%) Virus yield assay (Vero cells), yellow fever virus (YFV) 100 μg/mL (100% inhibition) [43]\nLippia alba (Mill.) N.E. Br. ex Britton \u0026 P. Wilson carvone (39.7%), limonene (30.6%), and bicyclosesquiphellandrene (8.9%) Plaque reduction assay (Vero cells), DENV−1, DENV−2, DENV−3, DENV−4, YFV 17 DD 10.1, 0.4, 32.6, 21.1, 4.9 [61]\nLippia alba (Mill.) N.E. Br. ex Britton \u0026 P. Wilson carvone (39.7%), limonene (30.6%), and bicyclosesquiphellandrene (8.9%) Plaque reduction assay (Vero cells), Yellow fever (YFV) 4.3 [62]\nLippia citriodora Kunth (syn. Aloysia citriodora Palau) geranial (18.9%), neral (15.6%), limonene (10.7%), and 1,8-cineole (5.0) Plaque reduction assay (Vero cells), DENV−1, DENV−2, DENV−3, DENV−4, YFV 17 DD 1.9, 2.9, 2.6, 33.7, 5.7 [61]\nLippia citriodora Kunth (syn. Aloysia citriodora Palau) geranial (18.9%), neral (15.6%), limonene (10.7%), and 1,8-cineole (5.0) Plaque reduction assay (Vero cells), Yellow fever (YFV) 19.4 [62]\nLippia graveolens Kunth carvacrol (56.8%), o−cymene (32.1%), and γ-terpinene (3.7%) h MTT assay (Mardin−Darby bovine kidney cells), HSV-1, ACVR−HSV-1 (acyclovir−resistant HSV-1), HRSV (human respiratory syncytial virus) 99.6, 55.9, 68.0 [63]\nLippia junelliana (Moldenke) Tronc. piperitenone oxide (= rotundifolone) (36.5%), limonene (23.1%), camphor (7.9%), and spathulenol (6.5%) Plaque reduction assay (Vero cells), HSV-1 \u003e150 [37]\nLippia origanoides carvacrol (44.0%), thymol (15.0%), and γ-terpinene (10.0%) Virus yield assay (Vero cells), yellow fever virus (YFV) 11.1 μg/mL (100% inhibition) [43]\nLippia turbinata Griseb. limonene (60.6%), piperitenone oxide (17.4%), and β-caryophyllene (6.4%) Plaque reduction assay (Vero cells), HSV-1 \u003e 150 [37]\nMatricaria recutita L. α-bisabolol oxide A (13.4–55.9%), α-bisabolol oxide B (8.4–25.1%), bisabolone oxide A (2.9–11.4%), cis−bicycloether (= (Z)−spiroether) (3.6–17.7%), and (E)-β-farnesene (1.9–10.4%) i Plaque reduction assay (RC-37 cells), HSV-1 0.3 [58]\nMatricaria recutita L. α-bisabolol oxide A (13.4–55.9%), α-bisabolol oxide B (8.4–25.1%), bisabolone oxide A (2.9−11.4%), cis−bicycloether (= (Z)−spiroether) (3.6–17.7%), and (E)-β-farnesene (1.9–10.4%) i Plaque reduction assay (RC-37 cells), HSV-2 1.5 [57]\nMelaleuca alternifolia Cheel terpinen-4-ol (36.71%), γ-terpinene (22.20%), and α-terpinene (10.10%) Plaque reduction assay, influenza A⁄PR ⁄ 8 virus subtype H1N1 60 [31]\nMelaleuca alternifolia Cheel terpinen-4-ol (30–48%), γ-terpinene (10–28%), α-terpinene (5–13%), 1,8-cineole (up to 15%), terpinolene (1.5−5%), p-cymene (0.5–12%), α-pinene (1–6%), and α-terpineol (1.5–8%) 100% inhibition of influenza type A (H1N1) virus at 0.01%; type A (H11N9) virus to tea tree oil vapor caused 100% inhibition [46]\nMelaleuca alternifolia Cheel terpinen-4-ol (47.5%), γ-terpinene (20.2%), and α-terpinene (8.6%) c Plaque reduction assay (Vero cells), HSV-1 2700 [48]\nMelaleuca alternifolia Cheel terpinen-4-ol (47.5%), γ-terpinene (20.2%), and α-terpinene (8.6%) c Plaque reduction assay (Vero cells), HSV-1 13.2 [64]\nMelaleuca alternifolia Cheel terpinen-4-ol (47.5%), γ-terpinene (20.2%), and α-terpinene (8.6%) c Plaque reduction assay (RC-37 cells), HSV-1 2 [52]\nMelaleuca alternifolia Cheel terpinen-4-ol (47.5%), γ-terpinene (20.2%), and α-terpinene (8.6%) c Plaque reduction assay (HeLa cells), HSV-2 2700 [47]\nMelaleuca alternifolia Cheel terpinen-4-ol (47.5%), γ-terpinene (20.2%), and α-terpinene (8.6%) c Plaque reduction assay (Vero cells), HSV-1 significant plaque reduction at 10 and 5% v/v [65]\nMelaleuca armillaris (Sol. ex Gaertn.) Sm. 1,8-cineole (33.9%), terpinen-4-ol (18.8%), and γ-terpinene (10.4%) Plaque reduction assay (Vero cells), HSV-1 99% plaque reduction (concentration not given) [66]\nMelaleuca ericifolia Sm. methyl eugenol (96.84%) Plaque reduction assay (Vero cells), HSV-1 91.5% plaque reduction (concentration not given) [66]\nMelaleuca leucadendra (L.) L. 1,8-cineole (64.3%), α-terpineol (11.0%), and valencene (3.91%) Plaque reduction assay (Vero cells), HSV-1 92% plaque reduction (concentration not given) [66]\nMelissa officinalis L. neral (17−32%), geranial (23–43%), linalool (up to 9.0%), citronellal (0.7–20.3%), geraniol (up to 23.2%), β-caryophyllene (up to 11.3%), and caryophyllene oxide (0.4−31.7%) influenza A virus (H9N2) Significant reduction at 5 μg/mL [46]\nMelissa officinalis L. β-cubebene (15.4%), β-caryophyllene (14.2%), α-cadinol (7.2%), geranial (6.6%), and neral (5.8%) Plaque reduction assay (HEp−2 cells), HSV-2 21 [67]\nMelissa officinalis L. geranial (20.1%), β-caryophyllene (17.3%), and neral (13.6%) Plaque reduction assay (RC-37 cells), HSV-1, HSV-2 4, 0.8 [68]\nMentha × piperita L. menthol (42.8%), menthone (14.6%), and isomenthone (5.9%) Plaque reduction assay (RC-37 cells), HSV-1, HSV-2 20, 8 [69]\nMentha × piperita L. menthol (43.8%), menthone (19.7%), menthyl acetate (6.5%), and 1,8-cineole (5.0%) c Plaque reduction assay (Vero cells), HSV-1 2200 [48]\nMentha suaveolens Ehrh. limonene (7.4%), isopulegol (12.0%), and piperitenone oxide (41.8%) Plaque reduction assay, cytopathogenic murine norovirus 0.87 [70]\nMentha suaveolens Ehrh. piperitenone oxide (86.9%) Plaque reduction assay (Vero cells), HSV-1 5.1 [64]\nMinthostachys mollis Griseb. cis−piperitone epoxide (29.9%), piperitenone oxide (25.6%), menthone (7.4%), germacrene D (5.8%), and pulegone (5.5%) Plaque reduction assay (Vero cells), HSV-1, HSV-2 70.7, 68.0 [55]\nOcimum basilicum var. album (L.) Benth. linalool (53.8%) and eugenol (12.6%) j Plaque reduction assay (Vero cells), HSV-1 \u003e10000 [48]\nOcimum campechianum Mill. methyl eugenol (53.9%), β-caryophyllene (13.0%), α-bulnesene (5.4%), germacrene D (3.4%), and α-humulene (3.3%) Plaque reduction assay (Vero cells), HSV-2 74.33 [55]\nOriganum elongatum Emb. (leaf EO) p-cymene (16.2%), γ-terpinene (13.5%), thymol (14.2%), and carvacrol (19.2%) Plaque reduction assay, cytopathogenic murine norovirus 0.37 [70]\nOriganum elongatum Emb. (inflorescence EO) p-cymene (16.1%), γ-terpinene (7.3%), and carvacrol (40.1%), Plaque reduction assay, cytopathogenic murine norovirus 0.75 [70]\nOriganum majorana L. terpinen-4-ol (28.9%), γ-terpinene (14.9%), trans−sabinene hydrate (9.5%), α-terpinene (8.7%), and sabinene (7.2%) c Plaque reduction assay (Vero cells), HSV-1 2800 [48]\nOriganum majorana L. terpinen-4-ol (28.9%), γ-terpinene (14.9%), trans−sabinene hydrate (9.5%), α-terpinene (8.7%), and sabinene (7.2%) c Plaque reduction assay (HeLa cells), HSV-2 520 [47]\nOriganum vulgare L. trans−sabinene hydrate (21.0%), thymol (11.0%), and carvacrol methyl ether (11.0%) Virus yield assay (Vero cells), yellow fever virus (YFV) 100 μg/mL (100% inhibition) [43]\nOsmunda regalis L. hexahydrofarnesyl acetone ( = phytone) (11.8%), 2,4−di−t−butylphenol (6.8%), phytol (6.5%), hexadecene (4.1%), and octadecene (4.4%) Plaque reduction assay, Coxsackie virus B4 type 2 2.24 [71]\nPectis odorata Griseb. limonene (50.2%), neral (27.2%), and geranial (23.6%) Plaque reduction assay DENV−2, JUNV and HSV-1 39.6, 36.6, and 71.5 [38]\nPelargonium graveolens L’Hér. ex Aiton citronellol (21.9–37.5%), citronellyl formate (9.8–20.6%), geraniol (6.0–16.5%), geranyl formate (1.5–6.5%), menthone (up to 13%), isomenthone (up to 9.9%), and linalool (0.8−14.9%) influenza type A (H1N1) 95% inhibition at 0.3% [46]\nPinus mugo Turra δ-3-carene (23.9%), α-pinene (17.9%), β-pinene (7.8%), and β-phellandrene (7.2%) k Plaque reduction assay (RC-37 cells), HSV-1 7 [58]\nRavensara aromatica Sonn. (syn. Cryptocarya agathophylla van der Werff) 1,8-cineole (52.6%), α-terpineol (12.4%), and sabinene (11.0%) l Plaque reduction assay (Vero cells), HSV-1 2800 [48]\nRosmarinus officinalis L. α-pinene (23.9%), verbenone (15.4%), camphor (11.0%), camphene (8.7%), p-cymene (7.5%), and 3−octanone (5.6%) Plaque reduction assay (Vero cells), HSV-1 60 [41]\nRosmarinus officinalis L. 1,8-cineole (45.9%), α-pinene (12.0%), camphor (10.9%), and β-pinene (6.3%) b Plaque reduction assay (Vero cells), HSV-1 2700 [48]\nSalvia fruticosa Mill. 1,8-cineole (47.5%), camphor (9.0%), β-thujone (7.6%), and α-thujone (4.3%) Plaque reduction assay (Vero cells), HSV-1 and HSV-2 1300 [72]\nSantalum album L. (Z)−α-santalol (45.2%), (Z)-β-santalol (25.4%), and (Z)−trans−α-bergamotol (7.8%) c Plaque reduction assay (Vero cells), HSV-1, HSV-2 22.7, 45.3 [73]\nSantalum album L. (Z)−α-santalol (45.2%), (Z)-β-santalol (25.4%), and (Z)−trans−α-bergamotol (7.8%) c Plaque reduction assay (RC-37 cells), HSV-1 2 [56]\nSantalum album L. (Z)−α-santalol (45.2%), (Z)-β-santalol (25.4%), and (Z)−trans−α-bergamotol (7.8%) c Plaque reduction assay (RC-37 cells), HSV-2 5 [57]\nSantolina insularis (Gennari ex Fiori) Arrigoni artemisia ketone (21.2%), allo−aromadendrene (12.7%), 1,8-cineole (9.0%), and camphene (8.5%) m Plaque reduction assay (Vero cells), HSV-1 and HSV-2 0.88, 0.7 [74]\nSatureja hortensis L. carvacrol (32.4%), γ-terpinene (32.0%), thymol (10.0%), and p-cymene (6.6%) Plaque reduction assay (Vero cells), HSV-1 80 [41]\nTessaria absinthioides (Hook. \u0026 Arn.) DC. caryophyllene oxide (12.2%), (E)-β-damascenone, γ-eudesmol (8.5%), α-gurjunene (5.8%), and terpinen-4-ol (5.4%) Plaque reduction assay (Vero cells), HSV-1 105 [37]\nThymus capitatus (L.) Hoffmanns. \u0026 Link (unripe fruit EO) carvacrol (68.6%), p-cymene (4.8%), γ-terpinene (3.0%), and β-caryophyllene (2.9%) Plaque reduction assay, cytopathogenic murine norovirus 0.49 [70]\nThymus capitatus (L.) Hoffmanns. \u0026 Link (ripe fruit EO) carvacrol (58.8%), p-cymene (5.6%), γ-terpinene (2.8%), and β-caryophyllene (2.6%) Plaque reduction assay, cytopathogenic murine norovirus 0.50 [70]\nThymus vulgaris L. thymol (31–50%), p-cymene (0.1–26.6%), and γ-terpinene (up to 22.8%) 100% inhibition of type A (H1N1) virus at 0.3% concentration [46]\nThymus vulgaris L. thymol (43.9%), carvacrol (14.4%), p-cymene (10.5%), β-caryophyllene (7.0%), and γ-terpinene (5.1%) c Plaque reduction assay (RC-37 cells), HSV-1 10 [56]\nThymus vulgaris L. thymol (43.9%), carvacrol (14.4%), p-cymene (10.5%), β-caryophyllene (7.0%), and γ-terpinene (5.1%) c Plaque reduction assay (RC-37 cells), HSV-1 11 [52]\nThymus vulgaris L. thymol (43.9%), carvacrol (14.4%), p-cymene (10.5%), β-caryophyllene (7.0%), and γ-terpinene (5.1%) c Plaque reduction assay (RC-37 cells), HSV-2 7 [57]\nThymus willdenowii Boiss. 1,8-cineole (34.62%), camphor (18.55%), α-pinene (9.46%), and camphene (5.38%) Plaque reduction assay, Coxsackie virus Inactive [75]\nTrachyspermum ammi (L.) Sprague thymol (35–60%), α-pinene, p-cymene, and limonene Plaque reduction assay, Japanese encephalitis virus 80% reduction at 500 μg/mL [76]\nZataria multiflora Boiss. thymol (47.3%), carvacrol (21.9%), p-cymene (8.6%), γ-terpinene (4.2%), and β-caryophyllene (3.0%) Real time PCR (H9N2 subtype of AIV) Reduced viral replication in trachea of broiler chickens [77]\nZataria multiflora Boiss. thymol (33.1%), carvacrol (25.9%), and p-cymene (11.3%) Plaque reduction assay (Vero cells), HSV-1 30 [41]\nZingiber officinale Roscoe α-zingiberene (32.1%), ar−curcumene (15.2%), β-sesquiphellandrene (10.9%), α-farnesene (7.2%), and α-phellandrene (4.4%) Plaque reduction assay, Caprine alphaherpesvirus type I not determined [78]\nZingiber officinale Roscoe α-zingiberene (26.4%), camphene (12.6%), β-sesquiphellandrene (9.2%), ar−curcumene (6.5%), β-phellandrene (6.2%), and β-bisabolene (5.1%) c Plaque reduction assay (RC-37 cells), HSV-1 2 [56]\nZingiber officinale Roscoe α-zingiberene (26.4%), camphene (12.6%), β-sesquiphellandrene (9.2%), ar−curcumene (6.5%), β-phellandrene (6.2%), and β-bisabolene (5.1%) c Plaque reduction assay (RC-37 cells), HSV-2 1 [57]\na Reported as cadinol, but see [79,80]. b Essential oil composition not reported; essential oil composition obtained from [81]. c Essential oil composition not reported; essential oil composition of commercial (dōTERRA International, Pleasant Grove, Utah, USA). d Essential oil composition not reported; essential oil composition obtained from [82]. e Essential oil composition not reported; essential oil composition obtained from [83]. f Essential oil composition not reported; essential oil composition obtained from [84]. g Essential oil composition not reported; essential oil composition obtained from [85]. h Essential oil composition not reported; essential oil composition obtained from [86]. i Essential oil composition not reported; essential oil composition obtained from [87]. j Essential oil composition not reported; essential oil composition obtained from [88]. k Essential oil composition not reported; essential oil composition obtained from [89]. l Essential oil composition not reported; essential oil composition obtained from [90]. m Essential oil composition not reported; essential oil composition obtained from [91].\nTable 2 Antiviral activities of essential oil components.\nEssential Oil Component Assay IC50 (μg/mL) Reference\n(E)−Anethole Plaque reduction assay (RC-37 cells), HSV-1 20 [59]\nCamphor Plaque reduction assay (Vero cells), HSV-1 2600 [72]\nCarvacrol MTT assay (Mardin−Darby bovine kidney (MDBK) cells, HSV-1 48.6 [63]\nβ-Caryophyllene Plaque reduction assay (RC-37 cells), HSV-1 0.25 [59]\nCaryophyllene oxide Plaque reduction assay (RC-37 cells), HSV-1 0.7 [59]\n1,8-Cineole Plaque reduction assay (Vero cells), HSV-1 1800 [72]\n1,8-Cineole Plaque reduction assay (RC-37 cells), HSV-1 1200 [52]\n(E)-Cinnamaldehyde Influenza type A (H1N1) virus 70% at a concentration of 0.53% after 3 h [95]\n(E)-Cinnamaldehyde H1N1 in-vivo by inhalation in a mouse model 89% inhibition [95]\nCitral (Geranial + Neral) Yellow fever (YFV), Vero cells 17.6 [62]\nCitral (Geranial + Neral) Plaque reduction assay (RC-37 cells), HSV-1 3.50 [52]\np-Cymene Influenza, HSV-1, HSV-2, ECHO 9, Cox B1, Polio 1, Adeno 6 \u003e500 [31]\np-Cymene Plaque reduction assay (RC-37 cells), HSV-1 16 [52]\np-Cymene Influenza type A (H1N1) virus Inactive [25]\nDodecanal Influenza type A (H1N1) virus 51 [54]\nβ-Eudesmol Plaque reduction assay (Vero cells), HSV-1 6 [59]\nEugenol Plaque reduction assay (RC-37 cells), HSV-1 35 [59]\nEugenol Plaque reduction assay (RC-37 cells), HSV-1 25.6 [96]\nFarnesol Plaque reduction assay (RC-37 cells), HSV-1 3.5 [59]\nGermacrone Influenza type A (H1N1) virus 1.22–1.55 [97]\nGermacrone Influenza type A (H3N2) virus 0.34 [97]\nGermacrone Influenza type B virus 1.38 [97]\nIsoborneol Plaque reduction assay (Vero cells), HSV-1 \u003c1000 [98]\nNerolidol (natural) Plaque reduction assay (RC-37 cells), HSV-1 4.2 [99]\nNerolidol (synthetic) Plaque reduction assay (RC-37 cells), HSV-1 1.5 [99]\nOctanal Influenza type A (H1N1) virus 15 [54]\nPatchouli alcohol Influenza type A (H1N1) 89% inhibition at 10 μg/mL [100]\nPatchouli alcohol Influenza type A (H2N2) 0.89 [101]\nPatchouli alcohol Influenza type A (H2N2), in-vivo test using a mouse model 70% survival rate at a dose of 5 mg/(kg day) [101]\nα-Pinene Plaque reduction assay (RC-37 cells), HSV-1 4.5 [52]\nPiperitenone oxide Plaque reduction assay (Vero cells) 1.4 [64]\nα-Terpinene Influenza type A (H1N1) virus Inactive [25]\nα-Terpinene Influenza, HSV-1, HSV-2, ECHO 9, Cox B1, Polio 1, Adeno 4 \u003e12 [31]\nα-Terpinene Plaque reduction assay (RC-37 cells), HSV-1 8.5 [52]\nγ-Terpinene Plaque reduction assay (RC-37 cells), HSV-1 7 [52]\nγ-Terpinene Influenza, HSV-1, HSV-2, ECHO 9, Cox B1, Polio 1, Adeno 5 \u003e120 [31]\nγ-Terpinene influenza type A (H1N1) virus inactive [25]\nTerpinen-4-ol Influenza, HSV-1, HSV-2, ECHO 9, Cox B1, Polio 1, Adeno 2 25 (influenza)\u003e50 (others) [31]\nTerpinen-4-ol Plaque reduction assay (Vero cells), HSV-1 60 [52]\nα-Terpineol Plaque reduction assay (RC-37 cells), HSV-1 22 [52]\nTerpinolene Influenza, HSV-1, HSV-2, ECHO 9, Cox B1, Polio 1, Adeno 3 12 (influenza)\u003e12 (others) [31]\nThujones (α \u0026 β) Plaque reduction assay (RC-37 cells), HSV-1 400 [72]\nThymol Influenza type A (H1N1) virus Active [25]\nThymol Plaque reduction assay (RC-37 cells), HSV-1 30 [52]\n2-Undecanone influenza type A (H1N1) virus 62 [54]\nTable 3 Docking scores, normalized for molecular weight (DSnorm, kJ/mol), of essential oil components with severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) molecular targets.\nCompound MainProtease Endoribo-Nuclease ADP RibosePhosphatase RNA-DependentRNA Polymerase Spike ProteinBinding Domain Angiotensin-Converting Enzyme a\n(E)-Anethole −84.9 −83.0 −97.5 −74.0 −65.2 −83.8\nallo-Aromadendrene −86.6 −86.9 −95.8 −74.9 −66.1 −85.3\nArtemiseole −89.2 −83.4 −96.6 −73.0 −67.8 −78.0\n(R)-Artemisia alcohol −84.3 −78.3 −88.2 −66.8 −61.1 −74.7\n(S)-Artemisia alcohol −86.1 −85.4 −98.5 −69.5 −67.1 −77.4\nArtemisia ketone −91.0 −85.7 −97.9 −71.9 −66.9 −77.3\nAscaridole −74.8 −68.2 −86.0 −65.2 −62.6 −64.4\nBenzyl benzoate −104.9 −96.5 −110.3 −82.5 −74.9 −96.4\n(Z)-trans-α-Bergamotol −98.0 −91.2 −105.9 −71.9 −63.6 −83.6\nBicyclogermacrene −85.9 −88.0 −92.5 −75.6 −68.2 −86.1\nBicyclosesquiphellandrene −79.4 −89.6 −86.0 −61.8 −62.5 −78.2\nα-Bisabolol oxide A −88.5 −87.6 −89.1 −71.5 −63.5 −89.7\nα-Bisabolol oxide B −96.6 −92.2 −101.0 −79.7 −75.2 −95.6\nBisabolone oxide A −93.7 −87.9 −98.2 −73.3 −71.0 −78.7\n(+)-Borneol −77.4 −91.8 −100.1 −74.1 −70.9 −73.3\n(−)-Borneol −71.4 −71.5 −78.4 −56.7 −50.1 −73.7\n(+)-iso-Borneol −75.6 −75.3 −75.9 −60.8 −53.2 −71.8\n(−)-iso-Borneol −73.8 −69.2 −75.6 −54.8 −49.3 −72.4\nα-Bulnesene −95.2 −72.4 −78.4 −57.0 −57.8 −101.7\nδ-Cadinene −91.6 −90.2 −112.6 −75.2 −60.0 −93.4\nτ-Cadinol −92.3 −82.8 −82.5 −69.9 −69.8 −87.8\n(R)-Calamene −92.3 −83.5 −97.4 −69.0 −65.6 −87.3\n(S)-Calamene −88.4 −86.8 −95.9 −70.2 −64.7 −87.5\n(+)-Camphene −85.6 −78.9 −83.2 −64.4 −57.9 −72.2\n(−)-Camphene −77.2 −74.1 −87.1 −66.0 −59.8 −67.1\n(+)-Camphor −75.2 −73.1 −77.9 −63.9 −53.8 −69.4\n(−)-Camphor −72.5 −70.0 −75.6 −64.3 −52.8 −70.8\n(+)-δ-3-Carene −87.9 −78.6 −87.0 −65.0 −72.4 −75.8\n(−)-δ-3-Carene −83.9 −88.0 −90.4 −66.8 −67.3 −73.4\nCarvacrol −84.5 −86.6 −94.8 −74.1 −71.0 −81.2\nCarvacrol methyl ether −85.5 −82.5 −103.1 −74.6 −65.8 −83.7\n(+)-cis−Carveol −87.0 −81.8 −97.7 −76.5 −69.7 −80.4\n(−)-cis−Carveol −85.6 −85.0 −95.6 −76.8 −74.3 −81.2\n(R)-Carvone −87.7 −82.4 −98.2 −74.7 −69.2 −83.4\n(S)-Carvone −86.2 −83.2 −98.9 −73.2 −66.3 −82.2\n(E)-Caryophyllene −81.2 −82.2 −93.9 −73.4 −59.2 −75.1\nCaryophyllene oxide −80.6 −86.7 −97.0 −74.1 −66.5 −83.3\nCedrol −82.3 −84.4 −80.1 −69.7 −58.3 −69.9\nepi-Cedrol −76.4 −88.4 −92.2 −68.5 −55.5 −75.9\nChamazulene −97.6 −96.4 −110.9 −76.9 −73.7 −95.6\n(−)-cis-Chrystanthyl acetate −83.2 −77.5 −87.1 −71.5 −60.2 −80.9\n(−)-trans−Chrysanthenyl acetate −77.0 −81.4 −85.3 −65.9 −68.9 −72.4\n1,8-Cineole −72.7 −67.6 −71.5 −58.1 −58.6 −61.0\n(E)-Cinnamaldehyde −93.1 −85.8 −100.0 −76.4 −73.1 −81.0\n(E)-Cinnamyl acetate −99.4 −88.0 −108.9 −76.9 −80.6 −89.5\n(R)-Citronellal −99.9 −91.6 −105.0 −75.1 −73.3 −88.0\n(S)-Citronellal −98.3 −88.9 −107.4 −72.1 −71.4 −86.2\n(R)-Citronellol −99.9 −90.2 −104.9 −75.7 −72.3 −84.9\n(S)-Citronellol −99.2 −92.2 −107.6 −74.2 −77.4 −85.1\n(R)-Citronellyl formate −105.5 −92.6 −109.9 −72.8 −76.2 −90.5\n(S)-Citronellyl formate −101.5 −96.4 −114.7 −81.9 −78.3 −91.0\nα-Copaene −84.1 −78.9 −85.9 −60.2 −59.6 −77.1\nCostunolide −94.5 −99.2 −110.2 −78.2 −74.9 −92.6\n(R)-Cryptone −86.6 −82.4 −93.5 −68.2 −70.4 −74.8\n(S)-Cryptone −81.5 −82.9 −94.9 −69.8 −70.6 −76.6\nβ-Cubebene −90.8 −92.0 −86.7 −76.0 −71.2 −89.8\nCuminaldehyde −86.2 −80.5 −103.3 −74.9 −67.5 −81.7\nar-Curcumene −105.3 −94.0 −108.6 −82.8 −75.8 −96.4\nCurcumol −83.0 −93.4 −91.2 −73.5 −69.6 −86.0\nCurdione −86.2 −98.1 −99.0 −77.3 −71.7 −92.0\nCurzerene −91.5 −86.0 −104.2 −76.8 −67.6 −90.5\nm-Cymene −83.6 −81.3 −92.8 −72.0 −67.6 −79.0\no-Cymene −83.2 −78.3 −87.7 −63.9 −63.3 −72.9\np-Cymene −79.7 −78.7 −91.0 −70.3 −63.9 −75.4\n(E)-β-Damascenone −85.2 −87.6 −110.2 −73.8 −73.8 −84.8\n(2E,4E)-Decadienal −105.7 −97.7 −112.5 −81.8 −78.7 −90.0\nDodecanal −102.8 −93.9 −101.9 −77.9 −73.3 −94.9\nEremanthin −97.7 −97.7 −98.0 −83.7 −81.3 −100.9\nβ-Eudesmol −97.6 −87.4 −106.5 −75.8 −64.5 −74.7\nγ-Eudesmol −93.6 −89.9 −94.7 −69.4 −66.1 −84.3\nEugenol −93.2 −91.7 −105.2 −80.0 −79.1 −88.4\nEugenol methyl ether −88.5 −85.3 −111.1 −71.7 −68.6 −89.3\nEugenyl acetate −96.3 −89.3 −115.1 −75.6 −70.6 −94.9\n(E,E)-α-Farnesene −115.0 −107.5 −112.8 −86.8 −85.3 −100.3\n(E)-β-Farnesene −115.4 −105.0 −116.3 −87.1 −82.9 −100.7\n(E,E)-Farnesol −112.4 −104.6 −121.4 −89.6 −80.8 −100.9\n(+)-Fenchone −80.0 −80.9 −87.1 −66.1 −60.8 −66.9\n(-)-Fenchone −83.3 −67.5 −86.2 −66.5 −60.9 −68.8\nFlavesone −82.3 −84.0 −95.7 −68.9 −64.4 −78.9\nGeranial −101.7 −90.8 −113.0 −76.1 −74.5 −92.0\nGeraniol −103.5 −98.5 −110.2 −77.4 −76.4 −93.8\nGeranyl formate −105.9 −93.9 −111.4 −80.8 −80.3 −96.2\nGermacrene D −92.1 −96.7 −110.5 −77.1 −73.0 −87.3\nGermacrone −85.1 −97.1 −94.9 −71.6 −67.1 −80.9\nGuiaol −94.1 −92.5 −113.4 −79.2 −79.4 −91.9\nα-Gurjunene −89.9 −83.2 −81.3 −71.5 −61.3 −79.8\nβ-Gurjunene −77.4 −64.1 −81.1 −64.1 −58.0 −75.1\nα-Himachalene −80.4 −89.7 −86.5 −63.7 −67.9 −74.3\nβ-Himachalene −85.5 −81.3 −88.6 −68.1 −62.9 −77.2\nHimachalol −77.2 −88.3 −100.8 −63.6 −63.7 −75.6\nα-Humulene −88.9 −90.9 −89.1 −74.9 −70.6 −86.7\nLeptospermone −85.5 −83.2 −92.9 −71.2 −64.1 −80.0\niso-Leptospermone −86.1 −82.7 −93.7 −69.1 −62.6 −83.5\n(R)-Limonene −82.2 −76.2 −92.0 −72.6 −67.3 −79.0\n(S)-Limonene −82.2 −73.8 −92.2 −72.4 −66.1 −77.5\n(R,S,R)-Limonene oxide −86.3 −77.7 −100.8 −76.7 −68.1 −85.1\n(S,R,R)-Limonene oxide −83.5 −87.4 −89.4 −66.7 −63.4 −76.4\n(S,R,S)-Limonene oxide −84.7 −80.7 −95.8 −74.9 −66.7 −83.8\n(R)-Linalool −96.0 −89.3 −101.4 −70.9 −79.0 −87.0\n(S)-Linalool −100.7 −87.5 −102.1 −71.4 −70.4 −87.8\n(R)-Linalyl acetate −101.4 −88.9 −105.1 −73.0 −74.3 −82.5\n(S)-Linalyl acetate −102.8 −90.8 −106.0 −68.5 −74.5 −82.3\np-Mentha-1(7),8-diene −82.3 −82.2 −94.3 −69.5 −65.9 −79.3\n(+)-Menthol −82.9 −86.2 −95.0 −71.8 −66.6 −77.7\n(-)-Menthol −82.3 −84.5 −95.1 −71.1 −69.2 −79.4\nMenthone −83.2 −77.8 −94.7 −69.3 −70.0 −74.4\niso-Menthone −81.0 −79.8 −97.6 −64.4 −63.5 −80.1\nα-Muurolene −86.9 −81.9 −96.9 −72.0 −66.0 −83.7\n(+)-γ-Muurolene −82.3 −82.9 −83.1 −72.2 −66.6 −84.4\n(-)-γ-Muurolene −88.4 −86.2 −106.7 −74.5 −68.5 −86.8\nMyrcene −98.7 −90.1 −102.2 −74.9 −71.4 −84.3\nNeral −102.6 −91.8 −110.5 −81.5 −72.4 −91.2\n(E)-Nerolidol −110.7 −101.4 −113.8 −83.5 −76.1 −100.6\n(E)-β-Ocimene −97.0 −90.2 −103.6 −76.3 −75.6 −86.7\n(Z)-β-Ocimene −98.3 −88.7 −103.2 −78.6 −73.9 −85.1\nOctanal −89.7 −83.8 −99.5 −71.3 −72.4 −80.5\n(R)-2-Octen-3-ol −88.1 −88.4 −96.6 −71.9 −70.7 −81.9\n(S)-1-Octen-3-ol −94.2 −90.7 −93.4 −77.1 −74.7 −80.0\n3-Octanone −88.9 −85.3 −94.7 −71.7 −72.9 −80.3\nPatchouli alcohol −63.5 −57.1 −66.7 −51.8 −43.0 −67.9\n(R)-Phellandral −87.6 −85.9 −102.5 −74.4 −66.2 −81.1\n(S)-Phellandral −87.7 −83.7 −101.6 −74.4 −66.5 −79.2\n(R)-α-Phellandrene −81.1 −82.9 −92.5 −70.1 −65.3 −76.4\n(S)-α-Phellandrene −81.6 −82.5 −92.3 −69.7 −65.6 −76.6\n(R)-β-Phellandrene −84.4 −83.7 −94.0 −69.8 −65.5 −75.2\n(S)-β-Phellandrene −82.9 −84.5 −94.0 −71.2 −67.5 −77.7\nPhytol −106.3 −94.2 −118.9 −74.9 −75.6 −93.3\nPhytone −106.4 −94.3 −116.9 −79.8 −72.3 −90.4\n(+)-α-Pinene −79.0 −70.7 −79.7 −59.4 −54.6 −63.7\n(-)-α-Pinene −77.3 −70.4 −72.9 −61.3 −54.7 −63.6\n(+)-β-Pinene −76.8 −71.8 −79.4 −63.7 −53.0 −65.2\n(-)-β-Pinene −78.8 −73.6 −73.9 −61.9 −56.1 −64.7\n(+)-Pinocamphone −74.9 −72.6 −79.4 −63.2 −62.4 −66.4\n(-)-Pinocamphone −73.2 −79.3 −81.8 −62.0 −61.4 −67.2\n(+)-iso-Pinocamphone −74.9 −75.0 −74.9 −66.6 −55.1 −66.5\n(-)-iso-Pinocamphone −77.1 −80.7 −77.5 −64.0 −55.6 −68.3\n(+)-cis-Pinocarveol −73.9 −78.1 −79.5 −67.7 −57.4 −70.2\n(-)-cis-Pinocarveol −74.1 −76.5 −78.8 −67.0 −58.6 −66.3\n(+)-trans-Pinocarveol −74.7 −80.5 −78.7 −65.8 −57.2 −70.6\n(-)-trans-Pinocarveol −77.6 −80.0 −82.6 −60.5 −55.5 −70.8\n(+)-Piperitone oxide −82.0 −81.5 −98.5 −66.2 −65.2 −77.8\n(-)-Piperitone oxide −81.6 −83.9 −94.9 −68.6 −60.8 −82.8\n(-)-iso-Pulegol −82.5 −85.1 −98.8 −75.2 −66.7 −79.3\n(R)-Pulegone −84.0 −83.1 −96.1 −66.4 −65.5 −78.3\n(S)-Pulegone −83.6 −78.6 −93.3 −67.2 −66.2 −78.9\nRotundifolone −83.1 −79.0 −96.6 −66.4 −62.1 −80.7\n(+)-Sabinene −86.4 −84.0 −92.2 −70.5 −68.6 −77.4\n(-)-Sabinene −87.8 −85.9 −94.7 −71.5 −69.6 −77.0\ncis-Sabinene hydrate −82.4 −81.1 −92.4 −68.0 −60.8 −78.2\n(Z)-α-Santalol −105.7 −95.3 −108.8 −84.7 −70.7 −95.8\n(E)-β-Santalol −104.8 −95.6 −106.2 −77.0 −70.9 −86.6\n(Z)-β-Santalol −104.4 −94.4 −106.2 −79.8 −73.2 −92.2\nβ-Sesquiphellandrene −103.8 −99.0 −115.7 −84.8 −75.3 −101.1\nSpathulenol −90.7 −88.0 −98.4 −77.8 −67.9 −90.4\n(Z)-Spiroether −111.8 −84.9 −103.1 −87.1 −79.3 −102.0\nγ-Terpinene −81.3 −79.3 −93.2 −71.2 −65.3 −76.6\n(R)-Terpinen-4-ol −80.4 −81.9 −89.5 −69.0 −64.9 −75.3\n(S)-Terpinen-4-ol −82.1 −81.8 −88.0 −70.4 −64.4 −76.4\n(R)-α-Terpineol −82.6 −88.3 −91.6 −65.6 −66.0 −72.6\n(S)-α-Terpineol −88.7 −86.8 −94.1 −71.6 −63.5 −82.0\nTerpinolene −80.7 −80.1 −94.7 −68.8 −63.9 −77.4\n(-)-α-Thujone −87.2 −89.3 −94.5 −66.9 −69.2 −78.1\n(+)-β-Thujone −86.9 −80.5 −94.2 −73.7 −69.7 −79.2\nThymohydroquinone dimethyl ether −89.5 −82.8 −104.6 −73.1 −67.0 −85.0\nThymol −84.4 −87.5 −94.6 −72.9 −70.8 −78.4\n2-Undecanone −101.3 −94.0 −108.3 −78.4 −72.8 −90.2\nValencene −84.7 −81.7 −92.6 −74.4 −68.3 −81.7\n(+)-Verbenone −84.7 −73.2 −82.5 −68.4 −54.8 −71.2\n(-)-Verbenone −83.8 −77.7 −77.4 −65.4 −57.8 −68.0\nViridiflorene −86.8 −90.2 −91.0 −76.3 −69.4 −88.8\nα-Zingiberene −106.4 −100.5 −115.4 −82.7 −71.4 −98.6\na Human angiotensin-converting enzyme 2 (hACE2).\nTable 4 Normalized docking scores ( DSnorm, kJ/mol) of essential oil components with bovine odorant binding protein (BtOBP), cruzain, torpedo acetylcholinesterase (TcAChE), Bacillus anthracis nicotinate mononucleotide adenylytransferase (BaNadD), Russell’s viper phospholipase A2 (DrPLA2), and Escherichia coli l-aspartate aminotransferase (EcAspTA).\nCompound BtOBP Cruzain TcAChE BaNadD DrPLA2 EcAspTA\n1GT3 1ME3 6G1U 3HFJ 1FV0 2Q7W\n(E)-Anethole −90.2 −73.3 −96.8 −112.9 −85.3 −88.1\nallo-Aromadendrene −85.0 −70.6 −92.8 −105.8 −87.8 −79.6\nArtemiseole −84.8 −74.2 −84.2 −90.6 −68.0 −71.7\n(R)-Artemisia alcohol −88.4 −68.3 −89.5 −94.8 −80.7 −81.5\n(S)-Artemisia alcohol −86.1 −74.0 −94.8 −101.4 −82.5 −81.4\nArtemisia ketone −93.1 −77.3 −91.5 −107.9 −87.8 −80.6\nAscaridole −79.7 −54.4 −72.1 −79.7 −75.0 −65.3\nBenzyl benzoate −105.0 −82.8 −115.8 −128.1 −97.3 −89.9\n(Z)-trans-α-Bergamotol −1 00.7 −73.6 −107.0 −94.2 −92.6 −85.8\nBicyclogermacrene −97.5 −82.4 −95.6 −105.5 −89.7 −89.0\nBicyclosesquiphellandrene −92.2 −52.5 −91.2 −110.7 −88.4 −75.7\nα-Bisabolol oxide A −94.7 −66.1 −102.8 −102.6 −77.1 −82.7\nα-Bisabolol oxide B −104.6 −90.4 −107.0 −121.9 −94.2 −89.8\nBisabolone oxide A −100.1 −71.9 −96.8 −84.7 −81.2 −86.7\n(+)-Borneol −72.5 −51.0 −72.0 −47.8 −61.4 −62.5\n(-)-Borneol −78.3 −53.1 −70.8 −49.0 −63.3 −56.2\n(+)-iso-Borneol −73.7 −55.6 −74.6 −31.0 −60.9 −59.7\n(-)-iso-Borneol −73.2 −55.3 −77.7 −52.6 −51.0 −57.4\nα-Bulnesene −93.4 −89.3 −109.3 −115.7 −94.4 −95.3\nδ-Cadinene −79.5 −86.8 −105.1 −116.8 −94.8 −82.3\nΤ-Cadinol −87.8 −71.8 −117.7 −121.7 −86.0 −87.0\n(R)-Calamene −80.3 −84.4 −116.5 −120.4 −91.3 −87.7\n(S)-Calamene −80.1 −82.5 −116.2 −121.8 −93.0 −88.3\n(+)-Camphene −79.0 −62.1 −77.0 −75.9 −69.3 −67.5\n(-)-Camphene −77.7 −62.8 −75.2 −77.4 −71.3 −70.6\n(+)-Camphor −76.0 −57.0 −75.0 −49.0 −53.5 −54.1\n(-)-Camphor −80.0 −54.1 −74.4 −52.9 −61.2 −56.4\n(+)-δ-3-Carene −80.4 −64.2 −80.6 −88.0 −71.8 −72.5\n(-)-δ-3-Carene −82.0 −68.9 −84.4 −90.2 −72.8 −72.9\nCarvacrol −82.4 −77.7 −94.8 −106.7 −81.6 −87.5\nCarvacrol methyl ether −85.6 −79.3 −96.6 −111.5 −84.2 −93.6\n(+)-cis-Carveol −89.1 −77.3 −96.9 −109.4 −81.3 −87.6\n(-)-cis-Carveol −89.0 −82.1 −95.5 −109.0 −83.2 −89.4\n(R)-Carvone −86.0 −80.7 −94.6 −109.9 −83.5 −91.5\n(S)-Carvone −88.0 −77.2 −94.1 −105.9 −82.8 −87.2\n(E)-Caryophyllene −87.3 −60.4 −88.1 −87.3 −87.4 −78.6\nCaryophyllene oxide −95.1 −73.1 −90.1 −97.0 −83.8 −77.8\nCedrol −87.7 −63.1 −96.4 −84.4 −86.3 −70.9\nepi-Cedrol −84.0 −59.7 −83.3 −86.7 −80.0 −76.2\nChamazulene −95.2 −89.2 −123.0 −132.1 −98.9 −101.6\n(-)-cis-Chrystanthyl acetate −85.8 −63.7 −89.8 −73.8 −76.5 −71.5\n(-)-trans-Chrysanthenyl acetate −80.9 −69.7 −82.4 −78.5 −76.5 −68.6\n1,8-Cineole −69.3 −51.1 −73.2 −54.4 −49.4 −47.3\n(E)-Cinnamaldehyde −87.7 −77.6 −98.2 −110.1 −85.7 −89.5\n(E)-Cinnamyl acetate −95.9 −88.2 −107.4 −132.5 −94.6 −103.1\n(R)-Citronellal −98.1 −90.5 −109.3 −120.7 −88.3 −105.7\n(S)-Citronellal −95.0 −89.7 −108.5 −123.3 −86.9 −104.1\n(R)-Citronellol −91.0 −90.0 −108.2 −122.4 −88.6 −107.7\n(S)-Citronellol −92.5 −91.9 −108.5 −122.0 −90.3 −100.3\n(R)-Citronellyl formate −98.0 −93.5 −118.7 −129.5 −87.5 −108.5\n(S)-Citronellyl formate −99.7 −95.1 −111.2 −135.6 −91.5 −94.8\nα-Copaene −88.9 −69.9 −84.6 −78.7 −81.7 −61.9\nCostunolide −106.8 −87.5 −116.7 −120.1 −100.3 −89.1\n(R)-Cryptone −74.9 −68.1 −92.2 −100.0 −78.5 −80.8\n(S)-Cryptone −79.0 −68.5 −91.6 −100.7 −82.7 −79.6\nβ-Cubebene −99.8 −67.2 −106.9 −112.2 −93.9 −94.8\nCuminaldehyde −84.9 −79.1 −95.3 −109.1 −90.1 −89.5\nar-Curcumene −98.1 −87.5 −116.0 −125.7 −94.1 −95.3\nCurcumol −90.1 −67.6 −100.4 −88.0 −87.6 −81.5\nCurdione −96.4 −75.1 −99.3 −116.3 −91.0 −78.7\nCurzerene −96.4 −80.3 −109.4 −89.7 −91.1 −86.4\nm-Cymene −78.9 −73.1 −96.1 −99.1 −76.6 −88.0\no-Cymene −77.0 −61.9 −89.8 −97.8 −76.2 −77.2\np-Cymene −82.8 −73.2 −91.3 −96.8 −80.9 −84.3\n(E)-β-Damascenone −90.1 −80.5 −100.7 −105.4 −88.9 −80.0\n(2E,4E)-Decadienal −96.4 −87.0 −110.4 −129.7 −95.8 −114.8\nDodecanal −95.8 −83.7 −110.3 −127.3 −89.2 −108.9\nEremanthin −80.1 −87.9 −121.3 −132.4 −98.7 −91.8\nβ-Eudesmol −95.2 −76.1 −98.6 −114.1 −85.3 −87.1\nγ-Eudesmol −94.9 −78.2 −106.1 −105.2 −89.7 −89.1\nEugenol −90.4 −82.4 −103.9 −119.3 −87.3 −98.8\nEugenol methyl ether −93.6 −78.1 −106.3 −116.8 −89.3 −94.4\nEugenyl acetate −94.9 −83.4 −109.2 −126.1 −100.1 −104.6\n(E,E)-α-Farnesene −115.5 −103.7 −129.8 −131.8 −101.2 −111.4\n(E)-β-Farnesene −112.1 −103.2 −122.7 −131.8 −105.3 −108.6\n(E,E)-Farnesol −116.8 −96.2 −133.0 −135.6 −100.5 −109.0\n(+)-Fenchone −78.4 −60.5 −79.5 −79.8 −62.4 −69.9\n(-)-Fenchone −80.3 −61.5 −81.0 −84.2 −65.5 −60.7\nFlavesone −87.1 −56.0 −88.6 −92.1 −85.2 −80.3\nGeranial −96.5 −94.9 −111.7 −119.3 −92.1 −101.5\nGeraniol −95.5 −93.6 −109.7 −118.0 −94.3 −107.3\nGeranyl formate −100.2 −89.7 −115.4 −128.3 −94.8 −114.1\nGermacrene D −102.4 −88.8 −109.9 −116.5 −93.7 −90.0\nGermacrone −92.4 −68.3 −94.5 −102.9 −88.3 −80.0\nGuiaol −100.8 −88.5 −113.3 −107.5 −92.6 −94.0\nα-Gurjunene −80.6 −61.6 −84.6 −100.0 −83.6 −78.1\nβ-Gurjunene −89.3 −38.8 −80.3 11.3 −77.6 −71.1\nα-Himachalene −89.2 −67.9 −83.9 −96.3 −87.6 −73.4\nβ-Himachalene −81.9 −65.4 −96.1 −110.8 −91.4 −76.8\nHimachalol −91.5 −64.1 −81.2 −24.7 −81.7 −66.3\nα-Humulene −94.0 −80.0 −89.9 −113.6 −89.2 −82.5\nLeptospermone −89.6 −64.0 −92.2 −102.7 −88.8 −80.7\niso-Leptospermone −92.8 −63.0 −90.1 −99.4 −86.2 −78.2\n(R)-Limonene −86.2 −75.7 −92.4 −99.6 −81.7 −86.8\n(S)-Limonene −84.9 −77.6 −93.4 −99.8 −83.3 −87.3\n(R,S,R)-Limonene oxide −87.1 −76.0 −93.2 −110.7 −84.9 −86.3\n(S,R,R)-Limonene oxide −84.6 −68.8 −85.0 −84.3 −76.2 −69.8\n(S,R,S)-Limonene oxide −91.2 −73.8 −97.4 −93.6 −85.1 −87.9\n(R)-Linalool −95.5 −89.9 −116.6 −112.4 −90.3 −89.9\n(S)-Linalool −93.0 −88.9 −110.1 −111.9 −91.0 −95.7\n(R)-Linalyl acetate −96.9 −87.1 −107.1 −112.5 −87.1 −95.2\n(S)-Linalyl acetate −100.0 −90.5 −110.2 −114.3 −86.6 −87.1\np-Mentha-1(7),8-diene −83.3 −74.4 −93.6 −100.0 −82.9 −84.9\n(+)-Menthol −86.1 −66.4 −98.6 −106.1 −79.2 −90.8\n(-)-Menthol −81.0 −68.9 −97.5 −106.3 −80.5 −89.7\nMenthone −82.4 −72.0 −92.6 −98.2 −82.8 −83.5\niso-Menthone −79.9 −64.8 −88.2 −102.4 −75.1 −82.0\nα-Muurolene −91.2 −79.9 −95.6 −113.7 −90.0 −82.8\n(+)-γ-Muurolene −85.2 −77.0 −98.7 −113.9 −93.2 −78.7\n(-)-γ-Muurolene −83.1 −83.4 −96.9 −106.3 −82.9 −80.5\nMyrcene −90.4 −88.8 −109.0 −112.7 −90.3 −101.1\nNeral −95.1 −94.1 −111.1 −122.8 −90.9 −105.4\n(E)-Nerolidol −111.5 −101.8 −131.9 −131.3 −99.6 −110.5\n(E)-β-Ocimene −91.8 −89.4 −104.6 −116.4 −89.0 −97.0\n(Z)-β-Ocimene −89.7 −90.6 −106.8 −112.1 −90.3 −94.4\nOctanal −85.8 −79.8 −97.6 −112.0 −85.7 −102.7\n(R)-2-Octen-3-ol −84.3 −81.5 −106.9 −107.1 −83.3 −101.1\n(S)-1-Octen-3-ol −84.5 −82.4 −108.4 −105.9 −85.0 −99.5\n3-Octanone −84.2 −82.5 −102.6 −111.6 −82.9 −101.8\nPatchouli alcohol −75.1 −41.4 −71.1 100.1 −10.1 −49.2\n(R)-Phellandral −92.3 −79.3 −97.4 −108.1 −88.9 −89.5\n(S)-Phellandral −92.9 −79.9 −96.1 −109.2 −88.9 −88.8\n(R)-α-Phellandrene −84.0 −69.7 −94.7 −100.8 −82.4 −83.8\n(S)-α-Phellandrene −84.3 −69.6 −93.5 −99.4 −82.6 −80.6\n(R)-β-Phellandrene −82.2 −69.9 −93.5 −102.0 −80.6 −84.1\n(S)-β-Phellandrene −83.8 −69.0 −93.2 −100.5 −80.2 −81.2\nPhytol −112.8 −93.8 −132.4 −134.7 −102.4 −112.9\nPhytone −117.8 −92.1 −124.5 −131.1 −99.7 −107.2\n(+)-α-Pinene −74.2 −58.0 −73.4 −62.4 −62.5 −54.4\n(-)-α-Pinene −72.8 −58.3 −70.4 −64.6 −61.7 −57.2\n(+)-β-Pinene −70.9 −57.8 −74.0 −64.1 −60.9 −55.5\n(-)-β-Pinene −73.5 −58.4 −73.1 −65.0 −63.7 −57.0\n(+)-Pinocamphone −76.5 −58.2 −73.6 −53.1 −55.4 −63.6\n(-)-Pinocamphone −76.6 −66.1 −76.5 −65.9 −72.3 −62.7\n(+)-iso-Pinocamphone −75.3 −59.0 −76.6 −54.0 −59.1 −58.1\n(-)-iso-Pinocamphone −76.2 −59.6 −76.7 −56.4 −65.8 −56.2\n(+)-cis-Pinocarveol −75.7 −58.2 −75.2 −51.7 −57.5 −58.1\n(-)-cis-Pinocarveol −75.7 −63.9 −73.5 −52.5 −66.3 −54.5\n(+)-trans-Pinocarveol −77.5 −60.6 −76.5 −71.1 −63.9 −61.4\n(-)-trans-Pinocarveol −72.4 −58.6 −77.2 −71.4 −56.3 −62.6\n(+)-Piperitone oxide −88.5 −70.5 −100.5 −104.2 −80.4 −78.0\n(-)-Piperitone oxide −86.0 −73.6 −99.6 −104.5 −80.7 −83.8\n(-)-iso-Pulegol −85.1 −72.0 −93.5 −106.7 −83.5 −93.8\n(R)-Pulegone −81.8 −69.9 −90.3 −103.9 −78.4 −74.4\n(S)-Pulegone −79.7 −69.6 −89.3 −99.9 −81.5 −76.4\nRotundifolone −86.1 −72.1 −96.1 −100.0 −82.4 −72.1\n(+)-Sabinene −87.9 −66.6 −84.5 −92.1 −80.5 −78.2\n(-)-Sabinene −79.7 −68.4 −91.4 −96.0 −80.8 −75.8\ncis-Sabinene hydrate −88.1 −70.2 −84.5 −91.1 −72.3 −68.1\n(Z)-α-Santalol −108.5 −85.6 −113.4 −106.8 −96.8 −90.7\n(E)-β-Santalol −105.0 −90.2 −110.6 −113.3 −94.3 −94.0\n(Z)-β-Santalol −108.0 −85.3 −110.4 −110.9 −96.5 −92.6\nβ-Sesquiphellandrene −103.9 −92.2 −116.6 −127.5 −99.4 −98.3\nSpathulenol −95.9 −94.8 −97.7 −102.8 −84.3 −102.2\n(Z)-Spiroether −112.8 −85.5 −124.3 −136.1 −101.5 −102.9\nγ-Terpinene −84.3 −74.9 −93.4 −98.7 −82.8 −85.9\n(R)-Terpinen-4-ol −87.3 −66.7 −81.5 −94.0 −80.2 −72.2\n(S)-Terpinen-4-ol −87.1 −67.2 −78.9 −92.3 −80.2 −71.7\n(R)-α-Terpineol −82.0 −68.0 −80.3 −82.2 −77.6 −71.3\n(S)-α-Terpineol −76.9 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Oils as Antiviral Agents, Potential of Essential Oils to Treat SARS-CoV-2 Infection: An In-Silico Investigation\n\nAbstract\nEssential oils have shown promise as antiviral agents against several pathogenic viruses. In this work we hypothesized that essential oil components may interact with key protein targets of the 2019 severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2). A molecular docking analysis was carried out using 171 essential oil components with SARS-CoV-2 main protease (SARS-CoV-2 Mpro), SARS-CoV-2 endoribonucleoase (SARS-CoV-2 Nsp15/NendoU), SARS-CoV-2 ADP-ribose-1″-phosphatase (SARS-CoV-2 ADRP), SARS-CoV-2 RNA-dependent RNA polymerase (SARS-CoV-2 RdRp), the binding domain of the SARS-CoV-2 spike protein (SARS-CoV-2 rS), and human angiotensin−converting enzyme (hACE2). The compound with the best normalized docking score to SARS-CoV-2 Mpro was the sesquiterpene hydrocarbon (E)-β-farnesene. The best docking ligands for SARS−CoV Nsp15/NendoU were (E,E)-α-farnesene, (E)-β-farnesene, and (E,E)−farnesol. (E,E)−Farnesol showed the most exothermic docking to SARS-CoV-2 ADRP. Unfortunately, the docking energies of (E,E)−α-farnesene, (E)-β-farnesene, and (E,E)−farnesol with SARS-CoV-2 targets were relatively weak compared to docking energies with other proteins and are, therefore, unlikely to interact with the virus targets. However, essential oil components may act synergistically, essential oils may potentiate other antiviral agents, or they may provide some relief of COVID-19 symptoms.\n\n1. Introduction\nThe 2019 severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) is a newly emerging respiratory illness. The epidemic started in December 2019 in Wuhan, China, and has rapidly spread throughout China and the world and is now a global pandemic. SARS-CoV-2 can be efficiently transmitted among humans and has shown a high degree of morbidity and mortality [1,2]. As of April 20, 2020, the worldwide number of infected individuals was 2,544,792, with as many as 175,694 deaths [3]. There are currently no approved vaccines available for the prevention of SARS-CoV-2 infection and only just recently, remdesivir has received “emergency use authorization” for treatment of COVID-19 in the United States; therefore, there is an urgent demand for potential chemotherapeutic agents to treat this disease.\nEssential oils have been screened against several pathogenic viruses (Table 1), including influenza and other respiratory viral infections. Influenza is an infectious respiratory disease caused by one of three types of influenza viruses, type A, type B, or type C [4]. The most significant in terms of human morbidity and mortality is influenza virus type A, which is found in several bird and mammal species [5]. Several different serotypes of influenza type A have caused global flu pandemics [6]: H1N1, which caused the Spanish flu in 1918 (40–50 million deaths worldwide) [7] and the swine flu in 2009 [8]; the Asian flu of 1957–1958 (ca. 1.5 million deaths worldwide) was caused by influenza A H2N2 [8]; serotype H3N2 caused the Hong Kong flu in 1968 [9]; and H5N1, which caused the bird flu in 2004 [10]. Influenza virus type B, however, is largely confined to human hosts [11].\nOne study evaluated the in vitro antiviral effect against influenza type A (H1N1) of commercial essential oils that included cinnamon (Cinnamomum zeylanicum), bergamot (Citrus bergamia), lemongrass (Cymbopogon flexuosus), thyme (Thymus vulgaris), and lavender (Lavandula angustifolia). The oils were tested in the liquid phase at a concentration of 0.3% and in the vapor phase. The oils of cinnamon, bergamot, thyme, and lemongrass displayed 100% inhibition of H1N1 in the liquid phase, while the inhibition for lavender essential oil was 85%. However, in the vapor phase, 100% inhibition was observed only for cinnamon leaf essential oil after 30 min of exposure. The bergamot, lemongrass, thyme, and lavender essential oils displayed inhibition rates of 95%, 90%, 70%, and 80%, respectively [12].\nCinnamomum zeylanicum leaf oil is characterized by eugenol (75–85%), followed by smaller amounts of linalool (1.6–8.5%), and benzyl benzoate (0.1–8.3%) [13,14,15]. Bergamot oil is rich in limonene (23–55%), linalool (2–37%), and linalyl acetate (12–41%), with lesser quantities of β-pinene (up to 10%) and γ-terpinene (up to 10%) [16,17,18,19,20]. Geranial (48–54%) and neral (29–33%) have been reported as the major components of C. flexuosus, but many chemotypes, cultivars, and variants have been reported for C. flexuosus [21,22].\nIn the literature, there have been at least 20 different chemotypes identified for thyme essential oil. The “typical” thyme essential oil presents a thymol content of 45% (range 31–50%), with significant concentrations of p-cymene (0.1–26.6%, average = 15.6%) and γ-terpinene (up to 22.8%, average = 9.3%). In addition, there are several other chemotypes of T. vulgaris rich in thymol and/or carvacrol [23]. Thymol has been identified as an anti-influenza agent against influenza type A and parainfluenza type 3 virus [24,25]. Lavandula angustifolia essential oil is rich in linalyl acetate (37.0–43.6%), linalool (19.7–39.1%), geraniol (up to 9.3%), β-caryophyllene (up to 5.1%), terpinen-4-ol (up to 14.9%), lavandulyl acetate (up to 5.5%), and borneol (up to 6.4%) [26,27,28,29].\nAnother essential oil with notable anti-influenza effects is tea tree, which is extracted from the leaves of Melaleuca alternifolia (Myrtaceae). Commercial tea tree oil is composed of terpinen-4-ol (30–48%), γ-terpinene (10–28%), α-terpinene (5–13%), 1,8-cineole (up to 15%), terpinolene (1.5–5%), p-cymene (0.5–12%), α-pinene (1–6%), and α-terpineol (1.5–8%) [30]. Tea tree oil showed 100% inhibition of influenza type A (H1N1) virus at 0.01% concentration and a median inhibitory concentration (IC50) of 6 μg/mL [31,32]. In addition, 30 min exposure of type A (H11N9) virus to tea tree oil vapor caused 100% inhibition [33]. The tea tree oil components, terpinen-4-ol, terpinolene, and α-terpineol, have shown anti-influenza virus activity against type A (H1N1), with IC50 values of 25, 12, and 250 μg/mL, respectively. α-Terpinene, γ-terpinene, and p-cymene were inactive, however [31].\nAvian influenza viruses (H5N1) exhibit both high and low virulence in numerous mammalian species, highlighting the connection between the route of inoculation and virus pathogenicity [34]. Since 2003, there have been over 600 documented cases of human infection with H5N1 viruses, with most cases among young, previously healthy individuals [35]. The essential oils extracted from Citrus reshni leaves and peel (unripe and ripe fruits) were tested against H5N1 virus by plaque reduction assay. The oils showed moderate inhibition of the H5N1 virus at a concentration of 2.5 μL/mL. Sabinene (40.5%), linalool (23.3%), and terpinen-4-ol (8.3%) were the main constituents in the leaf oil while limonene (82.4%, 91.6%) was the main compound in the fruit peel essential oils (unripe and ripe, respectively) [36].\nThe essential oil of leaves of Fortunella margarita is rich in the sesquiterpenoids β-eudesmol (28.3%), α-muurolene (10.3%), β-gurjunene (10.0%), γ-eudesmol (8.4%), and γ-muurolene (6.6%) while the essential oil extracted from the fruits showed monterpenoids as the main components, α-terpineol (55.5%), carvone (5.7%), and carveol (5.5%). Both samples were tested for antiviral activity against avian influenza (H5N1) virus, and the obtained results revealed that the fruit essential oil was more effective (80% virus inhibition by the MTT (3-(4,5-dimethylthiazol-2-yl)-2,5-diphenyltetrazolium bromide) assay using Madin−Darby canine kidney (MDCK) cells for virus propagation). The IC50 values obtained for the leaf and fruit essential oils were 38.89 and 6.77 μg/mL, respectively [53].\nDengue fever, a mosquito−borne disease, is caused by dengue virus (DENV) which includes four major serotypes (DENV-1, -2, -3, and -4). Some serotypes cause more severe diseases than others; severe dengue is associated with secondary infections by a different serotype. Dengue disease is a major public health problem in developing tropical countries and has being continuously spreading to new geographical areas [92]. The essential oils of two species of Lippia were assayed against four dengue serotypes (DENV-1, DENV-2, DENV-3, DENV-4) [61]. The IC50 values for Lippia alba oil, rich in carvone (39.7%), limonene (30.6%), and bicyclosesquiphellandrene (8.9%), were between 0.4 and 32.6 μg/mL. However, the Lippia citrodora essential oil, composed of geranial (18.9%), neral (15.6%), limonene (10.7%), and 1,8-cineole (5.0%), showed the best activity, with IC50 values varying from 1.9 to 33.7 μg/mL. No viral inhibitory effect was observed by addition of the essential oil after virus adsorption; the inhibitory effect of the essential oil seemed to cause direct virus inactivation before adsorption on the host cell.\nThe essential oils of seven aromatic plants from Córdoba, San Luis, and San Juan provinces (Argentina) were screened for cytotoxicity and in vitro inhibitory activity against dengue virus type 2 (DENV−2) [38]. The oils of Jungia polita and Buddleja cordobensis were composed of caryophyllene oxide (9.18%, 32.1%) and β-caryophyllene (8.13%, 16.5%) as the major compounds. However, these oils displayed different IC50 values (86.4 and 39.8 μg/mL, respectively). The other samples were composed mostly of monoterpenes and displayed lower activity, except Pectis odorata oil, which presented limonene (50.2%), neral (27.2%), and geranial (23.6%) as the major compounds and an IC50 value of 39.6 μg/mL. In addition, the essential oils of Artemisia mendozana, rich in camphor (22.4%), artemisole (11.7%), and artemisia alcohol (10.8%); Gailardia megapotamica composed of β-pinene (35.5%), spathulenol (10.7%), and germacrene D (6.8%); and Heterothalamus alienus characterized by β-pinene (35.5%), spathulenol (10.7%), and germacrene D (6.8%), showed an average IC50 value of 130.63 μg/mL.\nYellow fever (YF), caused by yellow fever virus (YFV), has historically been considered one of the most dangerous infectious diseases. YFV is transmitted to humans via mosquitoes of the Haemogogus, Sabethes, and Aedes genera. Annually, there are approximately 80,000–200,000 YFV cases worldwide, with a case fatality rate (CFR) ranging from 20–60% [93,94]. Essential oils of Lippia species and their main compounds have been tested against yellow fever virus (YFV) in Vero cells. The oil of Lippia origanoides showed carvacrol (44.0%), thymol (15.0%), and γ-terpinene (10.0%) as the main compounds and displayed 100% inhibition at a concentration of 11.1 μg/mL [43]. However, in the same study, the oil of L. alba displayed 100% inhibition at a concentration of 100.0 μg/mL. The major compounds were carvone (51.0%), limonene (33.0%), and bicyclosesquiphellandrene (7.0%). The essential oil of L. alba with a similar chemical composition, carvone (39.7%), limonene (30.6%), and bicyclosesquiphellandrene (8.9%), displayed an IC50 value of 4.3 μg/mL against YFV when tested in Vero cells using the MTT assay [62]. The essential oil of L. citriodora, dominated by geranial (18.9%), neral (15.6%), and limonene (10.7%), did not display a statistical difference in comparison to citral, with IC50 values of 19.4 and 17.6 μg/mL, respectively [62].\nIn addition to essential oils, several individual essential oil components have been screened for antiviral activity (Table 2).\nBecause of the activities of several essential oils and essential oil components against human pathogenic viruses, we hypothesized that essential oil components may be potentially useful as antiviral agents against SARS-CoV-2. In this work, we carried out a molecular docking analysis of the major components of essential oils that exhibit antiviral activity (Table 1 and Table 2) with known SARS-CoV-2 protein targets.\n\n2. Results and Discussion\nSeveral proteins have been identified for severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2), which may serve as potential targets for chemotherapeutic intervention in coronavirus disease 2019 (COVID-19). These protein targets include SARS-CoV-2 main protease (SARS-CoV-2 Mpro), SARS-CoV-2 endoribonucleoase (SARS-CoV-2 Nsp15/NendoU), SARS-CoV-2 ADP−ribose−1″−phosphatase (SARS-CoV-2 ADRP), SARS-CoV-2 RNA-dependent RNA polymerase (SARS-CoV-2 RdRp), the binding domain of the SARS-CoV-2 spike protein (SARS-CoV-2 rS), and human angiotensin−converting enzyme (hACE2). There have already been several molecular docking studies on these macromolecular targets. Several groups have carried out molecular docking of natural product libraries with SARS-CoV-2 Mpro [102,103,104,105]. Additionally, commercially available drugs have also been examined using in silico methods [106,107].\nA molecular docking study was carried out with 171 essential oil components with SARS-CoV-2 Mpro (PDB: 5R7Z, 5R80, 5R81, 5R82, 5R83, 5R84, 6LU7, 6M03, and 6Y84), SARS-CoV-2 Nsp15/NendoU (PDB: 6VWW, 6W01, and 6W02), SARS-CoV-2 rS (PDB: 6M0J, 6M17, 6VX1, and 6VW1), and SARS-CoV-2 RdRp (PDB: 6M71). The best docking scores are summarized in Table 3.\nThe main protease, SARS-CoV-2 Mpro, is a cysteine protease that is essential for processing the polyproteins that are translated from the coronavirus RNA [108]. The substrate binding site of the enzyme is a cleft flanked by Gln189, Met49, Pro168, Glu166 and His41; the active site is Cys145 and His41. The compound with the best normalized docking score to SARS-CoV-2 Mpro was the sesquiterpene hydrocarbon (E)-β-farnesene (DSnorm = −115.4 kJ/mol). Other essential oil components showing good docking scores with SARS-CoV-2 Mpro were (E,E)-α-farnesene (DSnorm = −115.0 kJ/mol), (E,E)-farnesol (DSnorm = −112.4 kJ/mol), and (E)-nerolidol (DSnorm = −110.7 kJ/mol). The sesquiterpene hydrocarbons (E,E)-α-farnesene and (E)-β-farnesene occupy the substrate binding site, flanked by Gln189, Arg188, Met165, His41, and Asp 187 (Figure 1). The lowest-energy docked poses of both (E,E)-farnesol and (E)-nerolidol showed hydrogen bonding of the alcohol moiety to Gln192 and Thr190 and, in the case of (E)-nerolidol, also with GLN189 and ARG188 (Figure 2).\nNon-structural protein 15 (Nsp15) of SARS-CoV-2 is an endoribonuclease that preferentially cleaves RNA at uridylate. Furthermore, it has been shown that SARS-CoV Nsp15/NendoU is required for successful viral infection [109]. The best docking ligands for SARS-CoV Nsp15/NendoU are (E,E)-α-farnesene (DSnorm = −107.5 kJ/mol), (E)-β-farnesene (DSnorm = −105.0 kJ/mol), (E,E)-farnesol (DSnorm = −104.6 kJ/mol), and (E)-nerolidol (DSnorm = −101.6 kJ/mol). All of these sesquiterpenoids preferentially docked into a binding site formed by amino acid residues Gln347, Ile328, Val276, Ser274, Thr275, Ser329, Asn74, Asn75, Glu327, and Lys71 (Figure 3). In addition to van der Waals interactions, (E,E)-farnesol showed hydrogen-bonding interactions with Ser329 and Glu327, while (E)-nerolidol hydrogen bonded with Asn75 and Lys71 (Figure 3). Unfortunately, the docking scores for these ligands as well as the scores of the other essential oil components with this protein are too low for it to be considered a viable target (see Table 3).\nADP ribose phosphatase (ADRP) serves to convert ADP-ribose 1″-monophosphate (Appr-1″-p) to ADP-ribose (Appr), which serves to regulate virus replication [110]. This enzyme may be dispensable in SARS-CoV-2, however [111]. Nevertheless, (E,E)-farnesol showed the most exothermic docking to SARS-CoV-2 ADRP with DSnorm = −121.4 kJ/mol. The binding site in SARS-CoV-2 ADRP is surrounded by Phe132, Asn40, Ile131, Ala38, and Ala39, with hydrogen-bonded interactions between the ligand alcohol and Asn40 (Figure 4). Additional essential oil components with good docking scores with SARS-CoV-2 ADRP include the sesquiterpene hydrocarbons (E)-β-farnesene (DSnorm = −116.3 kJ/mol), (E,E)-α-farnesene (DSnorm = −114.2 kJ/mol), β-sesquiphellandrene (DSnorm = −115.7 kJ/mol), and α-zingiberene (DSnorm = −115.4 kJ/mol); the diterpenoids phytol (DSnorm = −118.9 kJ/mol) and phytone (DSnorm = −116.9 kJ/mol); and the phenylpropanoid eugenyl acetate (DSnorm = −115.4 kJ/mol). Not surprisingly, β-sesquiphellandrene and α-zingiberene adopted the same docking orientation in the binding site of the enzyme (Figure 5A). Similarly, phytol and phytone occupy the same location in the binding site (Figure 5B).\nRNA-dependent RNA polymerase catalyzes RNA replication from an RNA template and is an essential enzyme in RNA viruses. Because these enzymes are crucial in viral replication, they are viable targets in antiviral chemotherapy [112]. Molecular docking of essential oil components with SARS-CoV-2 RdRp showed only weak docking with this enzyme target (Table 3). The ligand with the best docking score was (E,E)-farnesol, with DSnorm = −89.6 kJ/mol.\nThe SARS-CoV-2 spike protein serves to attach to angiotensin-converting enzyme 2 (ACE2) of the human cell to be invaded. The interface between SARS-CoV-2 rS and human ACE2 would be a promising target to prevent binding of SARS-CoV-2 rS to human ACE2 [113,114]. The best docking ligands with human ACE2, i.e., normalized docking scores \u003c -100 kJ/mol (α-bulnesene, eremanthin, (E,E)-α-farnesene, (E)-β-farnesene, (E,E)-farnesol, (E)-nerolidol, β-sesquiphellandrene, and (Z)-spiroether), all show docking preference to a cavity removed from the interaction interface between the SARS-CoV-2 spike protein and ACE2 (Figure 6). This cavity is a pocket surrounded by residues Pro565, Leu95, Val209, Asn210, Leu91, Lys94, Glu208, and Glu564. Because of the remote location of docking with ACE2, it is predicted that interaction of essential oil components with ACE2 will not prevent protein–protein interaction between the SARS-CoV-2 spike protein and human ACE2.\nOn the other hand, the lowest energy poses of essential oil components showing the strongest docking (\u003c−80 kJ/mol; (E)-cinnamyl acetate, eremanthin, (E,E)-α-farnesene, (E)-β-farnesene, (E,E)-farnesol, and geranyl formate) with the binding domain of the SARS-CoV-2 spike protein do lie at the interface between the SARS-CoV-2 spike protein and human ACE2 (Figure 6). This docking site is a hydrophobic pocket formed by Tyr505, Tyr495, Asn501, Arg403, Tyr453, and Gly502. Unfortunately, the docking energies at this site are too weak and are unlikely, therefore, to disrupt binding between SARS-CoV-2 rS and human ACE2.\nIn order to compare docking scores of the essential oil components with other proteins, docking was also carried out with six randomly selected non-virus proteins: Bovine odorant binding protein (BtOBP, PDB: 1GT3), cruzain (PDB: 1ME3), torpedo acetylcholinesterase (TcAChE, PDB: 6G1U), Bacillus anthracis nicotinate mononucleotide adenylytransferase (BaNadD, PDB: 3HFJ), Russell’s viper phospholipase A2 (DrPLA2, PDB: 1FV0), and Escherichia coli l-aspartate aminotransferase (EcAspTA, PDB: 2Q7W). Docking scores for these proteins are summarized in Table 4.\nThe docking results of the essential oil components with the six randomly selected proteins indicate the best docking ligands to SARS-CoV-2 targets (i.e., (E,E)-α-farnesene, (E)-β-farnesene, and (E,E)-farnesol) have better docking energies with other proteins. These three sesquiterpenes have docking energies of −129.8, −122.7, and −133.0 kJ/mol with TcAChE, respectively, and −131.8, −131.8, and −135.6 kJ/mol, respectively, with BaNadD. Indeed, most of the essential oil ligands have better docking properties with one or more of the random proteins compared to the SARS-CoV-2 proteins.\nBased on the docking energies of essential oil components with key protein targets of SARS-CoV-2, the individual essential oil components cannot be considered viable chemotherapeutic agents for interaction with the SARS-CoV-2 target proteins. However, essential oils are complex mixtures of compounds and several essential oil components may act synergistically to inhibit the virus. Astani and co-workers have shown, for example, that the antiviral activity (HSV-1) of Eucalyptus oil is much greater than the major component 1,8-cineole, and that tea tree oil has a greater antiviral activity than its components terpinen-4-ol, γ-terpinene, and α-terpinene [52].\nSynergistic effects have also been observed between essential oils and synthetic antiviral agents. Civitelli and co-workers observed an antiviral synergism between Mentha suaveolens essential oil and acyclovir on HSV-1 [64]. Likewise, Melissa officinalis essential oil potentiated the activity of oseltamivir against avian influenza virus H9N2 [115]. Furthermore, essential oils are lipophilic and therefore may also serve to disintegrate viral membranes [116].\nOutside of antiviral activity, there may be some relief of symptoms of COVID-19 provided by essential oils. For example, linalool [117,118], β-caryophyllene [119,120], and 1,8-cineole [121,122] have both anti-inflammatory and antinociceptive activity; menthol [123,124], camphor [125,126], and thymol [127] have antitussive activities.\n\n3. Materials and Methods\n\n3.1. Bibliographic Search Criteria\nThe bibliographic research was performed using the databases Google Scholar, Pubmed, Science Direct, Medline, and Scopus. The keywords applied were “antiviral activity” and “essential oils”, “antiviral activity” and “volatile compounds”, and “essential oils” and “respiratory diseases”.\n\n3.2. Ligand Selection\nThe major components (\u003e5%) of essential oils and pure essential oil components that have been screened against human pathogenic viruses were selected. In the case where enantiomers are known to be natural products, both structures were selected. A total of 171 essential oil components were used in the virtual screening.\n\n3.3. Molecular Docking\nEach ligand structure was prepared using Spartan ’18 v. 1.4.4 (Wavefunction, Inc., Irvine, CA, USA). The lowest-energy conformations of the ligands were determined and used as starting structures in the molecular docking. This is particularly important to include all potential conformations in medium-sized rings where interconversion between conformations may be hindered (e.g., bicyclogermacrene, costunolide, curdione, germacrene D, germacrone, and α-humulene). A total of six protein targets of SARS-CoV-2 from the Protein Data Bank (PDB), represented by a total of 17 structures, were used in the molecular docking, including SARS-CoV-2 main protease (PDB: 5R7Z, 5R80, 5R81, 5R82, 5R83, 5R84, 6LU7, 6M03, and 6Y84), SARS-CoV-2 endoribonuclease (PDB: 6VWW), SARS-CoV-2 ADP ribose phosphatase (PDB: 6W01 and 6W02), SARS-CoV-2 RNA-dependent RNA polymerase (PDB: 6M71), SARS-CoV-2 spike protein binding domain (PDB: 6M0J, 6VX1, 6VW1, and 6M17), and the human angiotensin-converting enzyme (PDB: 6M0J, 6VX1, 6VW1, and 6M17). Molecular docking was carried out using Molegro Virtual Docker v. 6.0.1 (Aarhus, Denmark) as previously reported [128,129]. Briefly, a 15-Å radius sphere centered on the binding sites of each protein structure in order to permit each ligand to search. In the case of the spike protein and human ACE2, the docking sphere was located at the interface between the spike protein and ACE2. In one case, ACE2 was removed and docking was carried out with the spike protein, and in the other case, the spike protein was removed and docking was carried out with ACE2. Standard protonation states of each protein, based on neutral pH, were used, and charges were assigned based on standard templates as part of the Molegro Virtual Docker program. Each protein was used as a rigid model without protein relaxation. Flexible-ligand models were used in the docking optimizations. Different orientations of the ligands were searched and ranked based on their “rerank” energy scores. A minimum of 100 runs for each ligand was carried out. In analyzing the docking scores, we accounted for the recognized bias due to molecular weight [130,131,132] using the scheme: DSnorm = 7.2 × Edock/MW⅓, where DSnorm is the normalized docking score, Edock is the MolDock re-rank score, MW is the molecular weight, and 7.2 is a scaling constant to ensure the average DSnorm values are comparable to those of Edock [128]. The best docking results are summarized in Table 1.\n\n4. Conclusions\nA molecular docking analysis was carried out using 171 essential oil components with the SARS-CoV-2 main protease (SARS-CoV-2 Mpro), SARS-CoV-2 endoribonucleoase (SARS-CoV-2 Nsp15/NendoU), SARS-CoV-2 ADP-ribose-1″-phosphatase (SARS-CoV-2 ADRP), SARS-CoV-2 RNA-dependent RNA polymerase (SARS-CoV-2 RdRp), the binding domain of the SARS-CoV-2 spike protein (SARS-CoV-2 rS), and human angiotensin-converting enzyme (hACE2). The best docking ligands for the SARS-CoV target proteins were (E,E)-α-farnesene, (E)-β-farnesene, and (E,E)-farnesol. The docking energies were relatively weak, however, and are unlikely to interact with the virus targets. However, essential oil components may act synergistically, essential oils may potentiate other antiviral agents, or they may provide some relief of COVID-19 symptoms.\n\nAcknowledgments\nW.N.S. participated in this work as part of the activities of the Aromatic Plant Research Center 237 (APRC, https://aromaticplant.org/).\n\nAuthor Contributions\nConceptualization, J.K.R.d.S., K.G.B., and W.N.S.; methodology, J.K.R.d.S., K.G.B., and W.N.S.; formal analysis, W.N.S.; investigation, J.K.R.d.S., P.L.B.F., K.G.B., and W.N.S.; data curation, W.N.S.; writing—original draft preparation, J.K.R.d.S. and W.N.S.; writing—review and editing, J.K.R.d.S., P.L.B.F., K.G.B., and W.N.S.; project administration, W.N.S.; All authors have read and agreed to the published version of the manuscript.\n\nFunding\nThis research received no external funding.\n\nConflicts of Interest\nThe authors declare no conflict of interest. Abbreviations\nAdeno Adenovirus\nAIV Avian influenza virus\nBaNadD Bacillus anthracis nicotinate mononucleotide adenylytransferase\nBtOBP Bovine odorant binding protein\nCOVID-19 Coronavirus disease 2019\nCox B1 Coxsackie B1 virus\nDENV-1 Dengue virus serotype 1\nDENV-2 Dengue virus serotype 2\nDENV-3 Dengue virus serotype 3\nDENV-4 Dengue virus serotype 4\nDrPLA2 Russell’s viper phospholipase A2\nDSnorm Normalized docking score\nEcAspTA Esherichia coli L-aspartate aminotransferase\nECHO 9 Echovirus 9\nhACE2 Human angiotensin-converting enzyme\nHeLa Human cervical tumor cells\nHEp-2 Human epithelial type 2 cells\nHRSV Human respiratory syncytial virus\nHSV-1 Herpes simplex virus 1\nHSV-2 Herpes simplex virus 2\nIC50 Median inhibitory concentration\nJUNV Junin virus\nMDCK Madin-Darby canine kidney cells\nMTT 3-(4,5-dimethylthiazol-2-yl)-2,5-diphenyltetrazolium bromide\nPCR Polymerase chain reaction\nPDB Protein data bank\nPolio 1 Poliomyelitis virus 1\nRC-37 African green monkey kidney cells\nSARS-CoV-2 2019 severe acute respiratory syndrome coronavirus 2\nTcAChE Torpedo acetylcholinesterase\nVero African green monkey kidney cells\nYFV Yellow fever virus\n\nFigure 1 Lowest-energy docked poses of (E)-β-farnesene and (E,E)-α-farnesene with the SARS-CoV-2 main protease (PDB: 6LU7). (A) Ribbon structure of the enzyme and (E)-β-farnesene. (B) Solid structure of the enzyme showing (E)-β-farnesene in the binding cleft. (C) Amino acid residues in proximity to the docked (E)-β-farnesene. (D) Lowest-energy docked pose of (E,E)-α-farnesene in the enzyme binding site.\nFigure 2 Lowest-energy docked poses of (E,E)-farnesol and (E)-nerolidol with the SARS-CoV-2 main protease (PDB: 6Y84). (A) Ribbon structure of the enzyme and (E,E)-farnesol (magenta) and (E)-nerolidol (orange). (B) Solid structure of the enzyme showing (E,E)-farnesol (magenta) and (E)-nerolidol (orange) in the binding cleft. (C) Important interactions of amino acid residues with (E,E)-farnesol. (D) Important interactions of amino acid residues with (E)-nerolidol. Hydrogen bonds are indicated with blue dashed lines.\nFigure 3 Lowest-energy docked poses of (E,E)-α-farnesene, (E)-β-farnesene, (E,E)-farnesol, and (E)-nerolidol with SARS-CoV-2 endoribonuclease (PDB: 6VWW). (A) Ribbon structure of the enzyme and (E,E)-α-farnesene (green), (E)-β-farnesene (aqua), (E,E)-farnesol (magenta), and (E)-nerolidol (orange). (B) Solid structure of the enzyme showing (E,E)-α-farnesene (green), (E)-β-farnesene (aqua), (E,E)-farnesol (magenta), and (E)-nerolidol (orange) in the binding cleft. (C) Lowest-energy docked pose of (E,E)-α-farnesene in the binding site. (D) Lowest-energy docked pose of (E)-β-farnesene in the binding site. (E) Lowest-energy docked pose of (E,E)-farnesol in the binding site. (F) Lowest-energy docked pose of (E)-nerolidol in the binding site. Hydrogen bonds are indicated with blue dashed lines.\nFigure 4 Lowest-energy docked pose of (E,E)-farnesol with SARS-CoV-2 ADP ribose phosphatase (PDB: 6W02). (A) Ribbon structure of the enzyme and the docked ligand. (B) Solid structure of the enzyme showing (E,E)-farnesol in the binding cleft. (C) Amino acid residues in proximity to the docked (E,E)-farnesol (hydrogen bonds are indicated with blue dashed lines).\nFigure 5 Lowest-energy docked poses of β-sesquiphellandrene, α-zingiberene, phytol, and phytone with SARS-CoV-2 ADP ribose phosphatase (PDB: 6W02). (A) Ribbon structure of the enzyme with β-sesquiphellandrene (brown) and α-zingiberene (yellow). (B) Ribbon structure of the enzyme with phytol (green) and phytone (red).\nFigure 6 Lowest-energy docked ligands with the binding domain of SARS-CoV-2 spike protein and human angiotensin-converting enzyme 2 (ACE2) (PDB: 6M17).\nTable 1 Essential oils showing antiviral activity.\nEssential Oil Major Components Assay IC50 (μg/mL) Reference\nAloysia gratissima (Gillies \u0026 Hook.) Tronc. caryophyllene oxide (15.8%), guaiol (17.4%) a, chrysanthenyl acetate (5.6%), and limonene oxide (5.3%) Plaque reduction assay (Vero cells), HSV-1 65.0 [37]\nAloysia triphylla Royle α-thujone (22.9%), cis−carveol (17.5%), carvone (13.2%), and limonene (12.7%) Plaque reduction assay (Vero cells), HSV-1 \u003e250 [38]\nArtemisia arborescens L. camphor (35.7%), β-thujone (24.0%), and chamazulene (7.7%) Plaque reduction assay (Vero cells), HSV-1 25% inhibition at 100 μg/mL [39]\nArtemisia arborescens L. Artemisia arborescens L. β-thujone (45.0%), camphor (6.8%), and chamazulene (22.7%) c Plaque reduction assay (Vero cells), HSV-1, HSV-2 2.4, 4.1 [40]\nArtemisia douglasiana Besser α-thujone (68.3%) and β-thujone (7.5%) Plaque reduction assay (Vero cells), HSV-1 83 [37]\nArtemisia kermanensis Podlech (syn. Seriphidium kermanense (Podlech) K. Bremer \u0026 Humphries α-thujone (13.8%), camphor (10.2%), and β-thujone (6.2%) Plaque reduction assay (Vero cells), HSV-1 40 [41]\nArtemisia mendozana DC. camphor (22.4%), artemiseole (11.7%), artemisia alcohol (10.8%), and borneol (7.2%) Plaque reduction assay, DENV−2, JUNV and HSV-1 129.3, 178.6, and 153.7 [38]\nArtemisia princeps Pamp. borneol (12.1%), α-thujone (8.7%), τ−cadinol, (6.7%), and 1,8-cineole (6.2%) Plaque reduction assay, murine norovirus−1 64% inhibition at 0.01% [42]\nPlaque reduction assay, feline calicivirus−F9 48% inhibition at 0.1%\nArtemisia vulgaris L. α-thujone (38.1%), β-thujone (10.6%), and 1,8-cineole (8.8%) Virus yield assay (Vero cells), yellow fever virus (YFV) 100 μg/mL (100% inhibition) [43]\nAyapana triplinervis (Vahl) R.M. King \u0026 H. Rob. thymohydroquinone dimethyl ether Plaque reduction assay (A549 cells), Zika virus 38.0 [44]\nBuddleja cordobensis Griseb. caryophyllene oxide (32.1%), β-caryophyllene (16.5%), and α-copaene (8.5%) Plaque reduction assay, DENV−2, JUNV and HSV-1 86.4, 39.0, and 54.1 [38]\nCedrus libani A. Rich. himachalol (22.5%), β-himachalene (21.9%), and α-himachalene (10.5%) Cytopathic effect (CPE) on Vero cells, HSV-1 440 [45]\nCinnamomum zeylanicum Blume (syn. Cinnamomum verum J. Presl) eugenol (75–85%), linalool (1.6−8.5%), (E)−cinnamaldehyde (0.6−1.5%), (E)−cinnamyl acetate (0.7–2.6%), β-caryophyllene (0.5–6.7%), eugenyl acetate (0.1–2.9%), and benzyl benzoate (0.1–8.3%) Influenza type A (H1N1) [46]\nCinnamomum zeylanicum Blume (syn. Cinnamomum verum J. Presl) (E)−cinnamaldehyde (63.9%), eugenol (7.0%), and (E)−cinnamyl acetate (5.1%) c Plaque reduction assay (HeLa cells), HSV-2 82 [47]\nCitrus × bergamia Risso \u0026 Poit. limonene (23–55%), linalool (2–37%), linalyl acetate (12–41%), β-pinene (up to 10%), and γ-terpinene (up to 10%) Influenza virus type A H1N1 100% inhibition at 0.3% [46]\nCitrus limonum Risso limonene (54.6%), γ-terpinene (19.1%), and β-pinene (14.5%) d Plaque reduction assay (Vero cells), HSV-1 2500 [48]\nCitrus reshni Hort ex Tan. (leaf EO) sabinene (40.5%), linalool (23.3%), and terpinen-4-ol (8.3%) Plaque reduction assay, influenza A virus H5N1 19.4% inhibition at 0.1 μL/mL [36]\nCitrus reshni Hort ex Tan. (unripe fruit peel EO) limonene (82.4%) and linalool (7.2%) Plaque reduction assay, influenza A virus H5N1 61.5% inhibition at 1.5 μL/mL [36]\nCitrus reshni Hort ex Tan. (ripe fruit peel EO) limonene (91.6%) Plaque reduction assay, influenza A virus H5N1 50% inhibition at 1.5 μL/mL [36]\nCupressus sempervirens L. α-pinene (51.9%) and δ-3-carene (24.9%) c Plaque reduction assay (Vero cells), HSV-1 6600 [48]\nCymbopogon citratus (DC.) Stapf geranial (40.2%), neral (30.6%), and geraniol (6.7%) c Plaque reduction assay (Vero cells), HSV-1 91 [48]\nCymbopogon flexuosus (Nees) Will. Watson geranial (48–54%) and neral (29–33%) Influenza virus type A (H1N1) [46]\nCynanchum stauntonii (Decne.) Schltr. ex H. Lév. (2E,4E)-decadienal (23.0%), γ-nonalactone (4.2%), 5-pentyl-2(3H)−furanone (3.8%), and 3-isopropyl-1-pentanol (3.5%) Influenza type A (H1N1) 64 [46]\nDysphania ambrosioides (L.) Mosyakin \u0026 Clemants cis-ascaridole (60.7%) and m-cymene (22.2%) Plaque reduction assay, Coxsackie virus B4 21.75 [49]\nEucalyptus astringens (Maiden) Maiden 1,8-cineole (42.0%), α-pinene (22.0%), and trans−pinocarveol (7.0%) Vero cells, Coxsakie virus B3 13.0 [50]\nEucalyptus bicostata Maiden, Blakely \u0026 Simmonds 1,8-cineole (68.0%), globulol (5.4%), and trans−pinocarveol (4.6%) Vero cells, Coxsakie virus B3 13.6 [50]\nEucalyptus caesia Benth. 1,8-cineole (40.2%), p-cymene (14.1%), γ-terpinene (12.4%), α-pinene (7.7%), and terpinen-4-ol (5.6%) Plaque reduction assay (Vero cells), HSV-1 70 [41]\nEucalyptus camaldulensis Dehnh. α-terpinene (26.3%), α-terpineol (9.1%), and camphene (8.5%) e Plaque reduction assay, Rotavirus Wa strain 50% inhibition at 10% EO concentration [51]\nEucalyptus camaldulensis Dehnh. α-terpinene (26.3%), α-terpineol (9.1%), and camphene (8.5%) e Plaque reduction assay, Coxsackie virus B4 53.3% at 10% EO concentration [51]\nEucalyptus camaldulensis Dehnh. α-terpinene (26.3%), α-terpineol (9.1%), and camphene (8.5%) e Plaque reduction assay, HSV-1 90% at 10% EO concentration [51]\nEucalyptus camaldulensis Dehnh. α-terpinene (26.3%), α-terpineol (9.1%), and camphene (8.5%) e Plaque reduction assay, adenovirus type 7 0% at 10% EO concentration [51]\nEucalyptus cinereal F. Muell. ex Benth. 1,8-cineole (70.4%), α-pinene (4.5%), and limonene (3.7%) Vero cells, Coxsakie virus B3 13.0 [50]\nEucalyptus globulus Labill. 1,8-cineole (63.8%) and α-pinene (14.0%) f Plaque reduction assay (Vero cells), HSV-1 1700 [48]\nEucalyptus globulus Labill. 1,8-cineole (63.8%) and α-pinene (14.0%) f Plaque reduction assay (RC-37 cells), HSV-1 55.0 [52]\nEucalyptus lehmannii (Schauer) Benth. 1,8-cineole (59.6%), α-pinene (17.6%), and α-terpineol (8.7%) Vero cells, Coxsakie virus B3 11.5 [50]\nEucalyptus leucoxylon F. Muell. 1,8-cineole (59.2%), α-pinene (7.8%), and α-terpineol (4.3%) Vero cells, Coxsakie virus B3 8.1 [50]\nEucalyptus maidenii F. Muell. 1,8-cineole (57.8%), p-cymene (7.4%), and α-pinene (7.3%) Vero cells, Coxsakie virus B3 14.5 [50]\nEucalyptus odorata Behr cryptone (20.9%), p-cymene (16.7%), phellandral (6.6%), and cuminal (6.6%) Vero cells, Coxsakie virus B3 19.2 [50]\nEucalyptus sideroxylon A. Cunn. ex Woolls 1,8-cineole (69.2%), α-pinene (6.9%), and α-terpineol (5.4%) Vero cells, Coxsakie virus B3 12.3 [50]\nEupatorium patens D. Don ex Hook. \u0026 Arn. germacrene D (36.2%), β-caryophyllene (14.1%), and bicyclogermacrene (7.0%) Plaque reduction assay (Vero cells), HSV-1 125 [37]\nFortunella margarita (Lour.) Swingle (leaf EO) α-terpineol (55.5%), carvone (5.7%), carveol (5.5%), γ-muurolene (5.5%), and citronellal (5.0%) MTT assay, reasserted avian influenza A virus, H5N1 6.77 [53]\nFortunella margarita (Lour.) Swingle (fruit EO) β-eudesmol (28.3%), α-muurolene (10.3%), β-gurjunene (10.0%), γ-eudesmol (8.4%), and γ-muurolene (6.6%) MTT assay, reasserted avian influenza A virus, H5N1 38.89 [53]\nGaillardia megapotamica (Spreng.) Baker β-pinene (24.2%), (Z)-β-ocimene (16.5%), α-pinene (7.7%), limonene (7.5%), and β-caryophyllene (6.7%) Plaque reduction assay, DENV−2, JUNV and HSV-1 140.6, 49.8, and 99.1 [38]\nHeterothalamus alienus (Spreng.) Kuntze β-pinene (35.5%), spathulenol (10.7%), and germacrene D (6.8%) Plaque reduction assay DENV−2, JUNV and HSV-1 122.3, 44.2 and 148.4 [38]\nHeterotheca latifolia Buckley borneol (40.0%), camphor (24.3%), and limonene (5.1%) Plaque reduction assay (Vero cells), HSV-1 \u003e150 [37]\nHouttuynia cordata Thunb. decanal (3.4−8.9%), decanol (up to 7.0%), 2−undecanone (23.0−36.1%), decanoic acid (1.4−6.3%), dodecanal (up to 7.3%), and 2−tridecanone (2.6−5.6%) Influenza type A (H1N1) 48 [54]\nHyptis mutabilis (Rich.) Briq. fenchone (17.1%), 1,8-cineole (12.6%), β-caryophyllene (10.9%), bicyclogermacrene (8.7%), and germacrene D (6.2%) Plaque reduction assay (Vero cells), HSV-2 (Human Herpesvirus type 1) 79.01 [55]\nHyptis mutabilis (Rich.) Briq. germacrene D (15.1%), β-caryophyllene (13.3%), curzerene (13.3%), and bicyclogermacrene (13.2%) Plaque reduction assay (Vero cells) \u003e150 [37]\nHyssopus officinalis L. cis−pinocamphone (40.1%), trans−pinocamphone (13.3%), β-pinene (10.7%), and β-phellandrene (5.3%) c Plaque reduction assay (RC-37 cells), HSV-1 1 [56]\nHyssopus officinalis L. cis−pinocamphone (40.1%), trans−pinocamphone (13.3%), β-pinene (10.7%), and β-phellandrene (5.3%) c Plaque reduction assay (RC-37 cells), HSV-2 6 [57]\nIllicium verum Hook. f. (E)−anethole (90.5%) c Plaque reduction assay (RC-37 cells), HSV-1 40 [58]\nIllicium verum Hook. f. (E)−anethole (90.5%) c Plaque reduction assay (RC-37 cells), HSV-1 1 [59]\nIllicium verum Hook. f. (E)−anethole (90.5%) c Plaque reduction assay (RC-37 cells), HSV-2 30 [57]\nJungia polita Griseb. caryophyllene oxide (9.2%) and β-caryophyllene (8.1%) Plaque reduction assay DENV−2, JUNV and HSV-1 39.8, 134.2 and 136.4 [38]\nJuniperus communis L. α-pinene (46.7%), myrcene (15.0%), sabinene (13.2%), and limonene (7.0%) c Plaque reduction assay (Vero cells), HSV-1 \u003e10000 [48]\nLavandula angustifolia Mill. linalyl acetate (37.0−43.6%), linalool (19.7−39.1%), geraniol (up to 9.3%), β-caryophyllene (up to 5.1%), terpinene−4−ol (up to 14.9%), lavandulol (up to 1.5%), lavandulyl acetate (up to 5.5%), 1,8-cineole (up to 4.1%), and borneol (up to 6.4%) 85% in vitro inhibition of influenza type A (H1N1) [46]\nLavandula latifolia Medik. linalool (31.9%), 1,8-cineole (18.8%), and borneol (10.1%) g Plaque reduction assay (Vero cells), HSV-1 2200 [48]\nLepechinia salviifolia (Kunth) Epling camphor (10.3%), limonene (9.7%), p−mentha−1(7),8−diene (7.4%), α-pinene (6.9%), and γ-terpinene (6.7%) Plaque reduction assay (Vero cells), HSV-1, HSV-2 68.8, 81.9 [55]\nLepechinia vulcanicola J.R.I. Wood limonene (18.9%), germacrene D (10.4%), 1−octen−3−ol (8.8%), β-caryophyllene (8.7%), and α-pinene (8.2%) Plaque reduction assay (Vero cells), HSV-1, HSV-2 112, 68.9 [55]\nLeptospermum scoparium J.R. Forst. \u0026 G. Forst. calamene (16.0%), leptospermone (14.5%), δ−cadinene (6.1%), flavesone (4.5%), viridiflorene (4.4%), and isoleptospermone (3.9%) Plaque reduction assay (RC-37 cells), HSV-1, HSV-2 0.96, 0.58 [60]\nLippia alba (Mill.) N.E. Br. ex Britton \u0026 P. Wilson carvone (51.0%), Limonene (33%), and bicyclosesquiphellandrene (7.0%) Virus yield assay (Vero cells), yellow fever virus (YFV) 100 μg/mL (100% inhibition) [43]\nLippia alba (Mill.) N.E. Br. ex Britton \u0026 P. Wilson carvone (39.7%), limonene (30.6%), and bicyclosesquiphellandrene (8.9%) Plaque reduction assay (Vero cells), DENV−1, DENV−2, DENV−3, DENV−4, YFV 17 DD 10.1, 0.4, 32.6, 21.1, 4.9 [61]\nLippia alba (Mill.) N.E. Br. ex Britton \u0026 P. Wilson carvone (39.7%), limonene (30.6%), and bicyclosesquiphellandrene (8.9%) Plaque reduction assay (Vero cells), Yellow fever (YFV) 4.3 [62]\nLippia citriodora Kunth (syn. Aloysia citriodora Palau) geranial (18.9%), neral (15.6%), limonene (10.7%), and 1,8-cineole (5.0) Plaque reduction assay (Vero cells), DENV−1, DENV−2, DENV−3, DENV−4, YFV 17 DD 1.9, 2.9, 2.6, 33.7, 5.7 [61]\nLippia citriodora Kunth (syn. Aloysia citriodora Palau) geranial (18.9%), neral (15.6%), limonene (10.7%), and 1,8-cineole (5.0) Plaque reduction assay (Vero cells), Yellow fever (YFV) 19.4 [62]\nLippia graveolens Kunth carvacrol (56.8%), o−cymene (32.1%), and γ-terpinene (3.7%) h MTT assay (Mardin−Darby bovine kidney cells), HSV-1, ACVR−HSV-1 (acyclovir−resistant HSV-1), HRSV (human respiratory syncytial virus) 99.6, 55.9, 68.0 [63]\nLippia junelliana (Moldenke) Tronc. piperitenone oxide (= rotundifolone) (36.5%), limonene (23.1%), camphor (7.9%), and spathulenol (6.5%) Plaque reduction assay (Vero cells), HSV-1 \u003e150 [37]\nLippia origanoides carvacrol (44.0%), thymol (15.0%), and γ-terpinene (10.0%) Virus yield assay (Vero cells), yellow fever virus (YFV) 11.1 μg/mL (100% inhibition) [43]\nLippia turbinata Griseb. limonene (60.6%), piperitenone oxide (17.4%), and β-caryophyllene (6.4%) Plaque reduction assay (Vero cells), HSV-1 \u003e 150 [37]\nMatricaria recutita L. α-bisabolol oxide A (13.4–55.9%), α-bisabolol oxide B (8.4–25.1%), bisabolone oxide A (2.9–11.4%), cis−bicycloether (= (Z)−spiroether) (3.6–17.7%), and (E)-β-farnesene (1.9–10.4%) i Plaque reduction assay (RC-37 cells), HSV-1 0.3 [58]\nMatricaria recutita L. α-bisabolol oxide A (13.4–55.9%), α-bisabolol oxide B (8.4–25.1%), bisabolone oxide A (2.9−11.4%), cis−bicycloether (= (Z)−spiroether) (3.6–17.7%), and (E)-β-farnesene (1.9–10.4%) i Plaque reduction assay (RC-37 cells), HSV-2 1.5 [57]\nMelaleuca alternifolia Cheel terpinen-4-ol (36.71%), γ-terpinene (22.20%), and α-terpinene (10.10%) Plaque reduction assay, influenza A⁄PR ⁄ 8 virus subtype H1N1 60 [31]\nMelaleuca alternifolia Cheel terpinen-4-ol (30–48%), γ-terpinene (10–28%), α-terpinene (5–13%), 1,8-cineole (up to 15%), terpinolene (1.5−5%), p-cymene (0.5–12%), α-pinene (1–6%), and α-terpineol (1.5–8%) 100% inhibition of influenza type A (H1N1) virus at 0.01%; type A (H11N9) virus to tea tree oil vapor caused 100% inhibition [46]\nMelaleuca alternifolia Cheel terpinen-4-ol (47.5%), γ-terpinene (20.2%), and α-terpinene (8.6%) c Plaque reduction assay (Vero cells), HSV-1 2700 [48]\nMelaleuca alternifolia Cheel terpinen-4-ol (47.5%), γ-terpinene (20.2%), and α-terpinene (8.6%) c Plaque reduction assay (Vero cells), HSV-1 13.2 [64]\nMelaleuca alternifolia Cheel terpinen-4-ol (47.5%), γ-terpinene (20.2%), and α-terpinene (8.6%) c Plaque reduction assay (RC-37 cells), HSV-1 2 [52]\nMelaleuca alternifolia Cheel terpinen-4-ol (47.5%), γ-terpinene (20.2%), and α-terpinene (8.6%) c Plaque reduction assay (HeLa cells), HSV-2 2700 [47]\nMelaleuca alternifolia Cheel terpinen-4-ol (47.5%), γ-terpinene (20.2%), and α-terpinene (8.6%) c Plaque reduction assay (Vero cells), HSV-1 significant plaque reduction at 10 and 5% v/v [65]\nMelaleuca armillaris (Sol. ex Gaertn.) Sm. 1,8-cineole (33.9%), terpinen-4-ol (18.8%), and γ-terpinene (10.4%) Plaque reduction assay (Vero cells), HSV-1 99% plaque reduction (concentration not given) [66]\nMelaleuca ericifolia Sm. methyl eugenol (96.84%) Plaque reduction assay (Vero cells), HSV-1 91.5% plaque reduction (concentration not given) [66]\nMelaleuca leucadendra (L.) L. 1,8-cineole (64.3%), α-terpineol (11.0%), and valencene (3.91%) Plaque reduction assay (Vero cells), HSV-1 92% plaque reduction (concentration not given) [66]\nMelissa officinalis L. neral (17−32%), geranial (23–43%), linalool (up to 9.0%), citronellal (0.7–20.3%), geraniol (up to 23.2%), β-caryophyllene (up to 11.3%), and caryophyllene oxide (0.4−31.7%) influenza A virus (H9N2) Significant reduction at 5 μg/mL [46]\nMelissa officinalis L. β-cubebene (15.4%), β-caryophyllene (14.2%), α-cadinol (7.2%), geranial (6.6%), and neral (5.8%) Plaque reduction assay (HEp−2 cells), HSV-2 21 [67]\nMelissa officinalis L. geranial (20.1%), β-caryophyllene (17.3%), and neral (13.6%) Plaque reduction assay (RC-37 cells), HSV-1, HSV-2 4, 0.8 [68]\nMentha × piperita L. menthol (42.8%), menthone (14.6%), and isomenthone (5.9%) Plaque reduction assay (RC-37 cells), HSV-1, HSV-2 20, 8 [69]\nMentha × piperita L. menthol (43.8%), menthone (19.7%), menthyl acetate (6.5%), and 1,8-cineole (5.0%) c Plaque reduction assay (Vero cells), HSV-1 2200 [48]\nMentha suaveolens Ehrh. limonene (7.4%), isopulegol (12.0%), and piperitenone oxide (41.8%) Plaque reduction assay, cytopathogenic murine norovirus 0.87 [70]\nMentha suaveolens Ehrh. piperitenone oxide (86.9%) Plaque reduction assay (Vero cells), HSV-1 5.1 [64]\nMinthostachys mollis Griseb. cis−piperitone epoxide (29.9%), piperitenone oxide (25.6%), menthone (7.4%), germacrene D (5.8%), and pulegone (5.5%) Plaque reduction assay (Vero cells), HSV-1, HSV-2 70.7, 68.0 [55]\nOcimum basilicum var. album (L.) Benth. linalool (53.8%) and eugenol (12.6%) j Plaque reduction assay (Vero cells), HSV-1 \u003e10000 [48]\nOcimum campechianum Mill. methyl eugenol (53.9%), β-caryophyllene (13.0%), α-bulnesene (5.4%), germacrene D (3.4%), and α-humulene (3.3%) Plaque reduction assay (Vero cells), HSV-2 74.33 [55]\nOriganum elongatum Emb. (leaf EO) p-cymene (16.2%), γ-terpinene (13.5%), thymol (14.2%), and carvacrol (19.2%) Plaque reduction assay, cytopathogenic murine norovirus 0.37 [70]\nOriganum elongatum Emb. (inflorescence EO) p-cymene (16.1%), γ-terpinene (7.3%), and carvacrol (40.1%), Plaque reduction assay, cytopathogenic murine norovirus 0.75 [70]\nOriganum majorana L. terpinen-4-ol (28.9%), γ-terpinene (14.9%), trans−sabinene hydrate (9.5%), α-terpinene (8.7%), and sabinene (7.2%) c Plaque reduction assay (Vero cells), HSV-1 2800 [48]\nOriganum majorana L. terpinen-4-ol (28.9%), γ-terpinene (14.9%), trans−sabinene hydrate (9.5%), α-terpinene (8.7%), and sabinene (7.2%) c Plaque reduction assay (HeLa cells), HSV-2 520 [47]\nOriganum vulgare L. trans−sabinene hydrate (21.0%), thymol (11.0%), and carvacrol methyl ether (11.0%) Virus yield assay (Vero cells), yellow fever virus (YFV) 100 μg/mL (100% inhibition) [43]\nOsmunda regalis L. hexahydrofarnesyl acetone ( = phytone) (11.8%), 2,4−di−t−butylphenol (6.8%), phytol (6.5%), hexadecene (4.1%), and octadecene (4.4%) Plaque reduction assay, Coxsackie virus B4 type 2 2.24 [71]\nPectis odorata Griseb. limonene (50.2%), neral (27.2%), and geranial (23.6%) Plaque reduction assay DENV−2, JUNV and HSV-1 39.6, 36.6, and 71.5 [38]\nPelargonium graveolens L’Hér. ex Aiton citronellol (21.9–37.5%), citronellyl formate (9.8–20.6%), geraniol (6.0–16.5%), geranyl formate (1.5–6.5%), menthone (up to 13%), isomenthone (up to 9.9%), and linalool (0.8−14.9%) influenza type A (H1N1) 95% inhibition at 0.3% [46]\nPinus mugo Turra δ-3-carene (23.9%), α-pinene (17.9%), β-pinene (7.8%), and β-phellandrene (7.2%) k Plaque reduction assay (RC-37 cells), HSV-1 7 [58]\nRavensara aromatica Sonn. (syn. Cryptocarya agathophylla van der Werff) 1,8-cineole (52.6%), α-terpineol (12.4%), and sabinene (11.0%) l Plaque reduction assay (Vero cells), HSV-1 2800 [48]\nRosmarinus officinalis L. α-pinene (23.9%), verbenone (15.4%), camphor (11.0%), camphene (8.7%), p-cymene (7.5%), and 3−octanone (5.6%) Plaque reduction assay (Vero cells), HSV-1 60 [41]\nRosmarinus officinalis L. 1,8-cineole (45.9%), α-pinene (12.0%), camphor (10.9%), and β-pinene (6.3%) b Plaque reduction assay (Vero cells), HSV-1 2700 [48]\nSalvia fruticosa Mill. 1,8-cineole (47.5%), camphor (9.0%), β-thujone (7.6%), and α-thujone (4.3%) Plaque reduction assay (Vero cells), HSV-1 and HSV-2 1300 [72]\nSantalum album L. (Z)−α-santalol (45.2%), (Z)-β-santalol (25.4%), and (Z)−trans−α-bergamotol (7.8%) c Plaque reduction assay (Vero cells), HSV-1, HSV-2 22.7, 45.3 [73]\nSantalum album L. (Z)−α-santalol (45.2%), (Z)-β-santalol (25.4%), and (Z)−trans−α-bergamotol (7.8%) c Plaque reduction assay (RC-37 cells), HSV-1 2 [56]\nSantalum album L. (Z)−α-santalol (45.2%), (Z)-β-santalol (25.4%), and (Z)−trans−α-bergamotol (7.8%) c Plaque reduction assay (RC-37 cells), HSV-2 5 [57]\nSantolina insularis (Gennari ex Fiori) Arrigoni artemisia ketone (21.2%), allo−aromadendrene (12.7%), 1,8-cineole (9.0%), and camphene (8.5%) m Plaque reduction assay (Vero cells), HSV-1 and HSV-2 0.88, 0.7 [74]\nSatureja hortensis L. carvacrol (32.4%), γ-terpinene (32.0%), thymol (10.0%), and p-cymene (6.6%) Plaque reduction assay (Vero cells), HSV-1 80 [41]\nTessaria absinthioides (Hook. \u0026 Arn.) DC. caryophyllene oxide (12.2%), (E)-β-damascenone, γ-eudesmol (8.5%), α-gurjunene (5.8%), and terpinen-4-ol (5.4%) Plaque reduction assay (Vero cells), HSV-1 105 [37]\nThymus capitatus (L.) Hoffmanns. \u0026 Link (unripe fruit EO) carvacrol (68.6%), p-cymene (4.8%), γ-terpinene (3.0%), and β-caryophyllene (2.9%) Plaque reduction assay, cytopathogenic murine norovirus 0.49 [70]\nThymus capitatus (L.) Hoffmanns. \u0026 Link (ripe fruit EO) carvacrol (58.8%), p-cymene (5.6%), γ-terpinene (2.8%), and β-caryophyllene (2.6%) Plaque reduction assay, cytopathogenic murine norovirus 0.50 [70]\nThymus vulgaris L. thymol (31–50%), p-cymene (0.1–26.6%), and γ-terpinene (up to 22.8%) 100% inhibition of type A (H1N1) virus at 0.3% concentration [46]\nThymus vulgaris L. thymol (43.9%), carvacrol (14.4%), p-cymene (10.5%), β-caryophyllene (7.0%), and γ-terpinene (5.1%) c Plaque reduction assay (RC-37 cells), HSV-1 10 [56]\nThymus vulgaris L. thymol (43.9%), carvacrol (14.4%), p-cymene (10.5%), β-caryophyllene (7.0%), and γ-terpinene (5.1%) c Plaque reduction assay (RC-37 cells), HSV-1 11 [52]\nThymus vulgaris L. thymol (43.9%), carvacrol (14.4%), p-cymene (10.5%), β-caryophyllene (7.0%), and γ-terpinene (5.1%) c Plaque reduction assay (RC-37 cells), HSV-2 7 [57]\nThymus willdenowii Boiss. 1,8-cineole (34.62%), camphor (18.55%), α-pinene (9.46%), and camphene (5.38%) Plaque reduction assay, Coxsackie virus Inactive [75]\nTrachyspermum ammi (L.) Sprague thymol (35–60%), α-pinene, p-cymene, and limonene Plaque reduction assay, Japanese encephalitis virus 80% reduction at 500 μg/mL [76]\nZataria multiflora Boiss. thymol (47.3%), carvacrol (21.9%), p-cymene (8.6%), γ-terpinene (4.2%), and β-caryophyllene (3.0%) Real time PCR (H9N2 subtype of AIV) Reduced viral replication in trachea of broiler chickens [77]\nZataria multiflora Boiss. thymol (33.1%), carvacrol (25.9%), and p-cymene (11.3%) Plaque reduction assay (Vero cells), HSV-1 30 [41]\nZingiber officinale Roscoe α-zingiberene (32.1%), ar−curcumene (15.2%), β-sesquiphellandrene (10.9%), α-farnesene (7.2%), and α-phellandrene (4.4%) Plaque reduction assay, Caprine alphaherpesvirus type I not determined [78]\nZingiber officinale Roscoe α-zingiberene (26.4%), camphene (12.6%), β-sesquiphellandrene (9.2%), ar−curcumene (6.5%), β-phellandrene (6.2%), and β-bisabolene (5.1%) c Plaque reduction assay (RC-37 cells), HSV-1 2 [56]\nZingiber officinale Roscoe α-zingiberene (26.4%), camphene (12.6%), β-sesquiphellandrene (9.2%), ar−curcumene (6.5%), β-phellandrene (6.2%), and β-bisabolene (5.1%) c Plaque reduction assay (RC-37 cells), HSV-2 1 [57]\na Reported as cadinol, but see [79,80]. b Essential oil composition not reported; essential oil composition obtained from [81]. c Essential oil composition not reported; essential oil composition of commercial (dōTERRA International, Pleasant Grove, Utah, USA). d Essential oil composition not reported; essential oil composition obtained from [82]. e Essential oil composition not reported; essential oil composition obtained from [83]. f Essential oil composition not reported; essential oil composition obtained from [84]. g Essential oil composition not reported; essential oil composition obtained from [85]. h Essential oil composition not reported; essential oil composition obtained from [86]. i Essential oil composition not reported; essential oil composition obtained from [87]. j Essential oil composition not reported; essential oil composition obtained from [88]. k Essential oil composition not reported; essential oil composition obtained from [89]. l Essential oil composition not reported; essential oil composition obtained from [90]. m Essential oil composition not reported; essential oil composition obtained from [91].\nTable 2 Antiviral activities of essential oil components.\nEssential Oil Component Assay IC50 (μg/mL) Reference\n(E)−Anethole Plaque reduction assay (RC-37 cells), HSV-1 20 [59]\nCamphor Plaque reduction assay (Vero cells), HSV-1 2600 [72]\nCarvacrol MTT assay (Mardin−Darby bovine kidney (MDBK) cells, HSV-1 48.6 [63]\nβ-Caryophyllene Plaque reduction assay (RC-37 cells), HSV-1 0.25 [59]\nCaryophyllene oxide Plaque reduction assay (RC-37 cells), HSV-1 0.7 [59]\n1,8-Cineole Plaque reduction assay (Vero cells), HSV-1 1800 [72]\n1,8-Cineole Plaque reduction assay (RC-37 cells), HSV-1 1200 [52]\n(E)-Cinnamaldehyde Influenza type A (H1N1) virus 70% at a concentration of 0.53% after 3 h [95]\n(E)-Cinnamaldehyde H1N1 in-vivo by inhalation in a mouse model 89% inhibition [95]\nCitral (Geranial + Neral) Yellow fever (YFV), Vero cells 17.6 [62]\nCitral (Geranial + Neral) Plaque reduction assay (RC-37 cells), HSV-1 3.50 [52]\np-Cymene Influenza, HSV-1, HSV-2, ECHO 9, Cox B1, Polio 1, Adeno 6 \u003e500 [31]\np-Cymene Plaque reduction assay (RC-37 cells), HSV-1 16 [52]\np-Cymene Influenza type A (H1N1) virus Inactive [25]\nDodecanal Influenza type A (H1N1) virus 51 [54]\nβ-Eudesmol Plaque reduction assay (Vero cells), HSV-1 6 [59]\nEugenol Plaque reduction assay (RC-37 cells), HSV-1 35 [59]\nEugenol Plaque reduction assay (RC-37 cells), HSV-1 25.6 [96]\nFarnesol Plaque reduction assay (RC-37 cells), HSV-1 3.5 [59]\nGermacrone Influenza type A (H1N1) virus 1.22–1.55 [97]\nGermacrone Influenza type A (H3N2) virus 0.34 [97]\nGermacrone Influenza type B virus 1.38 [97]\nIsoborneol Plaque reduction assay (Vero cells), HSV-1 \u003c1000 [98]\nNerolidol (natural) Plaque reduction assay (RC-37 cells), HSV-1 4.2 [99]\nNerolidol (synthetic) Plaque reduction assay (RC-37 cells), HSV-1 1.5 [99]\nOctanal Influenza type A (H1N1) virus 15 [54]\nPatchouli alcohol Influenza type A (H1N1) 89% inhibition at 10 μg/mL [100]\nPatchouli alcohol Influenza type A (H2N2) 0.89 [101]\nPatchouli alcohol Influenza type A (H2N2), in-vivo test using a mouse model 70% survival rate at a dose of 5 mg/(kg day) [101]\nα-Pinene Plaque reduction assay (RC-37 cells), HSV-1 4.5 [52]\nPiperitenone oxide Plaque reduction assay (Vero cells) 1.4 [64]\nα-Terpinene Influenza type A (H1N1) virus Inactive [25]\nα-Terpinene Influenza, HSV-1, HSV-2, ECHO 9, Cox B1, Polio 1, Adeno 4 \u003e12 [31]\nα-Terpinene Plaque reduction assay (RC-37 cells), HSV-1 8.5 [52]\nγ-Terpinene Plaque reduction assay (RC-37 cells), HSV-1 7 [52]\nγ-Terpinene Influenza, HSV-1, HSV-2, ECHO 9, Cox B1, Polio 1, Adeno 5 \u003e120 [31]\nγ-Terpinene influenza type A (H1N1) virus inactive [25]\nTerpinen-4-ol Influenza, HSV-1, HSV-2, ECHO 9, Cox B1, Polio 1, Adeno 2 25 (influenza)\u003e50 (others) [31]\nTerpinen-4-ol Plaque reduction assay (Vero cells), HSV-1 60 [52]\nα-Terpineol Plaque reduction assay (RC-37 cells), HSV-1 22 [52]\nTerpinolene Influenza, HSV-1, HSV-2, ECHO 9, Cox B1, Polio 1, Adeno 3 12 (influenza)\u003e12 (others) [31]\nThujones (α \u0026 β) Plaque reduction assay (RC-37 cells), HSV-1 400 [72]\nThymol Influenza type A (H1N1) virus Active [25]\nThymol Plaque reduction assay (RC-37 cells), HSV-1 30 [52]\n2-Undecanone influenza type A (H1N1) virus 62 [54]\nTable 3 Docking scores, normalized for molecular weight (DSnorm, kJ/mol), of essential oil components with severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) molecular targets.\nCompound MainProtease Endoribo-Nuclease ADP RibosePhosphatase RNA-DependentRNA Polymerase Spike ProteinBinding Domain Angiotensin-Converting Enzyme a\n(E)-Anethole −84.9 −83.0 −97.5 −74.0 −65.2 −83.8\nallo-Aromadendrene −86.6 −86.9 −95.8 −74.9 −66.1 −85.3\nArtemiseole −89.2 −83.4 −96.6 −73.0 −67.8 −78.0\n(R)-Artemisia alcohol −84.3 −78.3 −88.2 −66.8 −61.1 −74.7\n(S)-Artemisia alcohol −86.1 −85.4 −98.5 −69.5 −67.1 −77.4\nArtemisia ketone −91.0 −85.7 −97.9 −71.9 −66.9 −77.3\nAscaridole −74.8 −68.2 −86.0 −65.2 −62.6 −64.4\nBenzyl benzoate −104.9 −96.5 −110.3 −82.5 −74.9 −96.4\n(Z)-trans-α-Bergamotol −98.0 −91.2 −105.9 −71.9 −63.6 −83.6\nBicyclogermacrene −85.9 −88.0 −92.5 −75.6 −68.2 −86.1\nBicyclosesquiphellandrene −79.4 −89.6 −86.0 −61.8 −62.5 −78.2\nα-Bisabolol oxide A −88.5 −87.6 −89.1 −71.5 −63.5 −89.7\nα-Bisabolol oxide B −96.6 −92.2 −101.0 −79.7 −75.2 −95.6\nBisabolone oxide A −93.7 −87.9 −98.2 −73.3 −71.0 −78.7\n(+)-Borneol −77.4 −91.8 −100.1 −74.1 −70.9 −73.3\n(−)-Borneol −71.4 −71.5 −78.4 −56.7 −50.1 −73.7\n(+)-iso-Borneol −75.6 −75.3 −75.9 −60.8 −53.2 −71.8\n(−)-iso-Borneol −73.8 −69.2 −75.6 −54.8 −49.3 −72.4\nα-Bulnesene −95.2 −72.4 −78.4 −57.0 −57.8 −101.7\nδ-Cadinene −91.6 −90.2 −112.6 −75.2 −60.0 −93.4\nτ-Cadinol −92.3 −82.8 −82.5 −69.9 −69.8 −87.8\n(R)-Calamene −92.3 −83.5 −97.4 −69.0 −65.6 −87.3\n(S)-Calamene −88.4 −86.8 −95.9 −70.2 −64.7 −87.5\n(+)-Camphene −85.6 −78.9 −83.2 −64.4 −57.9 −72.2\n(−)-Camphene −77.2 −74.1 −87.1 −66.0 −59.8 −67.1\n(+)-Camphor −75.2 −73.1 −77.9 −63.9 −53.8 −69.4\n(−)-Camphor −72.5 −70.0 −75.6 −64.3 −52.8 −70.8\n(+)-δ-3-Carene −87.9 −78.6 −87.0 −65.0 −72.4 −75.8\n(−)-δ-3-Carene −83.9 −88.0 −90.4 −66.8 −67.3 −73.4\nCarvacrol −84.5 −86.6 −94.8 −74.1 −71.0 −81.2\nCarvacrol methyl ether −85.5 −82.5 −103.1 −74.6 −65.8 −83.7\n(+)-cis−Carveol −87.0 −81.8 −97.7 −76.5 −69.7 −80.4\n(−)-cis−Carveol −85.6 −85.0 −95.6 −76.8 −74.3 −81.2\n(R)-Carvone −87.7 −82.4 −98.2 −74.7 −69.2 −83.4\n(S)-Carvone −86.2 −83.2 −98.9 −73.2 −66.3 −82.2\n(E)-Caryophyllene −81.2 −82.2 −93.9 −73.4 −59.2 −75.1\nCaryophyllene oxide −80.6 −86.7 −97.0 −74.1 −66.5 −83.3\nCedrol −82.3 −84.4 −80.1 −69.7 −58.3 −69.9\nepi-Cedrol −76.4 −88.4 −92.2 −68.5 −55.5 −75.9\nChamazulene −97.6 −96.4 −110.9 −76.9 −73.7 −95.6\n(−)-cis-Chrystanthyl acetate −83.2 −77.5 −87.1 −71.5 −60.2 −80.9\n(−)-trans−Chrysanthenyl acetate −77.0 −81.4 −85.3 −65.9 −68.9 −72.4\n1,8-Cineole −72.7 −67.6 −71.5 −58.1 −58.6 −61.0\n(E)-Cinnamaldehyde −93.1 −85.8 −100.0 −76.4 −73.1 −81.0\n(E)-Cinnamyl acetate −99.4 −88.0 −108.9 −76.9 −80.6 −89.5\n(R)-Citronellal −99.9 −91.6 −105.0 −75.1 −73.3 −88.0\n(S)-Citronellal −98.3 −88.9 −107.4 −72.1 −71.4 −86.2\n(R)-Citronellol −99.9 −90.2 −104.9 −75.7 −72.3 −84.9\n(S)-Citronellol −99.2 −92.2 −107.6 −74.2 −77.4 −85.1\n(R)-Citronellyl formate −105.5 −92.6 −109.9 −72.8 −76.2 −90.5\n(S)-Citronellyl formate −101.5 −96.4 −114.7 −81.9 −78.3 −91.0\nα-Copaene −84.1 −78.9 −85.9 −60.2 −59.6 −77.1\nCostunolide −94.5 −99.2 −110.2 −78.2 −74.9 −92.6\n(R)-Cryptone −86.6 −82.4 −93.5 −68.2 −70.4 −74.8\n(S)-Cryptone −81.5 −82.9 −94.9 −69.8 −70.6 −76.6\nβ-Cubebene −90.8 −92.0 −86.7 −76.0 −71.2 −89.8\nCuminaldehyde −86.2 −80.5 −103.3 −74.9 −67.5 −81.7\nar-Curcumene −105.3 −94.0 −108.6 −82.8 −75.8 −96.4\nCurcumol −83.0 −93.4 −91.2 −73.5 −69.6 −86.0\nCurdione −86.2 −98.1 −99.0 −77.3 −71.7 −92.0\nCurzerene −91.5 −86.0 −104.2 −76.8 −67.6 −90.5\nm-Cymene −83.6 −81.3 −92.8 −72.0 −67.6 −79.0\no-Cymene −83.2 −78.3 −87.7 −63.9 −63.3 −72.9\np-Cymene −79.7 −78.7 −91.0 −70.3 −63.9 −75.4\n(E)-β-Damascenone −85.2 −87.6 −110.2 −73.8 −73.8 −84.8\n(2E,4E)-Decadienal −105.7 −97.7 −112.5 −81.8 −78.7 −90.0\nDodecanal −102.8 −93.9 −101.9 −77.9 −73.3 −94.9\nEremanthin −97.7 −97.7 −98.0 −83.7 −81.3 −100.9\nβ-Eudesmol −97.6 −87.4 −106.5 −75.8 −64.5 −74.7\nγ-Eudesmol −93.6 −89.9 −94.7 −69.4 −66.1 −84.3\nEugenol −93.2 −91.7 −105.2 −80.0 −79.1 −88.4\nEugenol methyl ether −88.5 −85.3 −111.1 −71.7 −68.6 −89.3\nEugenyl acetate −96.3 −89.3 −115.1 −75.6 −70.6 −94.9\n(E,E)-α-Farnesene −115.0 −107.5 −112.8 −86.8 −85.3 −100.3\n(E)-β-Farnesene −115.4 −105.0 −116.3 −87.1 −82.9 −100.7\n(E,E)-Farnesol −112.4 −104.6 −121.4 −89.6 −80.8 −100.9\n(+)-Fenchone −80.0 −80.9 −87.1 −66.1 −60.8 −66.9\n(-)-Fenchone −83.3 −67.5 −86.2 −66.5 −60.9 −68.8\nFlavesone −82.3 −84.0 −95.7 −68.9 −64.4 −78.9\nGeranial −101.7 −90.8 −113.0 −76.1 −74.5 −92.0\nGeraniol −103.5 −98.5 −110.2 −77.4 −76.4 −93.8\nGeranyl formate −105.9 −93.9 −111.4 −80.8 −80.3 −96.2\nGermacrene D −92.1 −96.7 −110.5 −77.1 −73.0 −87.3\nGermacrone −85.1 −97.1 −94.9 −71.6 −67.1 −80.9\nGuiaol −94.1 −92.5 −113.4 −79.2 −79.4 −91.9\nα-Gurjunene −89.9 −83.2 −81.3 −71.5 −61.3 −79.8\nβ-Gurjunene −77.4 −64.1 −81.1 −64.1 −58.0 −75.1\nα-Himachalene −80.4 −89.7 −86.5 −63.7 −67.9 −74.3\nβ-Himachalene −85.5 −81.3 −88.6 −68.1 −62.9 −77.2\nHimachalol −77.2 −88.3 −100.8 −63.6 −63.7 −75.6\nα-Humulene −88.9 −90.9 −89.1 −74.9 −70.6 −86.7\nLeptospermone −85.5 −83.2 −92.9 −71.2 −64.1 −80.0\niso-Leptospermone −86.1 −82.7 −93.7 −69.1 −62.6 −83.5\n(R)-Limonene −82.2 −76.2 −92.0 −72.6 −67.3 −79.0\n(S)-Limonene −82.2 −73.8 −92.2 −72.4 −66.1 −77.5\n(R,S,R)-Limonene oxide −86.3 −77.7 −100.8 −76.7 −68.1 −85.1\n(S,R,R)-Limonene oxide −83.5 −87.4 −89.4 −66.7 −63.4 −76.4\n(S,R,S)-Limonene oxide −84.7 −80.7 −95.8 −74.9 −66.7 −83.8\n(R)-Linalool −96.0 −89.3 −101.4 −70.9 −79.0 −87.0\n(S)-Linalool −100.7 −87.5 −102.1 −71.4 −70.4 −87.8\n(R)-Linalyl acetate −101.4 −88.9 −105.1 −73.0 −74.3 −82.5\n(S)-Linalyl acetate −102.8 −90.8 −106.0 −68.5 −74.5 −82.3\np-Mentha-1(7),8-diene −82.3 −82.2 −94.3 −69.5 −65.9 −79.3\n(+)-Menthol −82.9 −86.2 −95.0 −71.8 −66.6 −77.7\n(-)-Menthol −82.3 −84.5 −95.1 −71.1 −69.2 −79.4\nMenthone −83.2 −77.8 −94.7 −69.3 −70.0 −74.4\niso-Menthone −81.0 −79.8 −97.6 −64.4 −63.5 −80.1\nα-Muurolene −86.9 −81.9 −96.9 −72.0 −66.0 −83.7\n(+)-γ-Muurolene −82.3 −82.9 −83.1 −72.2 −66.6 −84.4\n(-)-γ-Muurolene −88.4 −86.2 −106.7 −74.5 −68.5 −86.8\nMyrcene −98.7 −90.1 −102.2 −74.9 −71.4 −84.3\nNeral −102.6 −91.8 −110.5 −81.5 −72.4 −91.2\n(E)-Nerolidol −110.7 −101.4 −113.8 −83.5 −76.1 −100.6\n(E)-β-Ocimene −97.0 −90.2 −103.6 −76.3 −75.6 −86.7\n(Z)-β-Ocimene −98.3 −88.7 −103.2 −78.6 −73.9 −85.1\nOctanal −89.7 −83.8 −99.5 −71.3 −72.4 −80.5\n(R)-2-Octen-3-ol −88.1 −88.4 −96.6 −71.9 −70.7 −81.9\n(S)-1-Octen-3-ol −94.2 −90.7 −93.4 −77.1 −74.7 −80.0\n3-Octanone −88.9 −85.3 −94.7 −71.7 −72.9 −80.3\nPatchouli alcohol −63.5 −57.1 −66.7 −51.8 −43.0 −67.9\n(R)-Phellandral −87.6 −85.9 −102.5 −74.4 −66.2 −81.1\n(S)-Phellandral −87.7 −83.7 −101.6 −74.4 −66.5 −79.2\n(R)-α-Phellandrene −81.1 −82.9 −92.5 −70.1 −65.3 −76.4\n(S)-α-Phellandrene −81.6 −82.5 −92.3 −69.7 −65.6 −76.6\n(R)-β-Phellandrene −84.4 −83.7 −94.0 −69.8 −65.5 −75.2\n(S)-β-Phellandrene −82.9 −84.5 −94.0 −71.2 −67.5 −77.7\nPhytol −106.3 −94.2 −118.9 −74.9 −75.6 −93.3\nPhytone −106.4 −94.3 −116.9 −79.8 −72.3 −90.4\n(+)-α-Pinene −79.0 −70.7 −79.7 −59.4 −54.6 −63.7\n(-)-α-Pinene −77.3 −70.4 −72.9 −61.3 −54.7 −63.6\n(+)-β-Pinene −76.8 −71.8 −79.4 −63.7 −53.0 −65.2\n(-)-β-Pinene −78.8 −73.6 −73.9 −61.9 −56.1 −64.7\n(+)-Pinocamphone −74.9 −72.6 −79.4 −63.2 −62.4 −66.4\n(-)-Pinocamphone −73.2 −79.3 −81.8 −62.0 −61.4 −67.2\n(+)-iso-Pinocamphone −74.9 −75.0 −74.9 −66.6 −55.1 −66.5\n(-)-iso-Pinocamphone −77.1 −80.7 −77.5 −64.0 −55.6 −68.3\n(+)-cis-Pinocarveol −73.9 −78.1 −79.5 −67.7 −57.4 −70.2\n(-)-cis-Pinocarveol −74.1 −76.5 −78.8 −67.0 −58.6 −66.3\n(+)-trans-Pinocarveol −74.7 −80.5 −78.7 −65.8 −57.2 −70.6\n(-)-trans-Pinocarveol −77.6 −80.0 −82.6 −60.5 −55.5 −70.8\n(+)-Piperitone oxide −82.0 −81.5 −98.5 −66.2 −65.2 −77.8\n(-)-Piperitone oxide −81.6 −83.9 −94.9 −68.6 −60.8 −82.8\n(-)-iso-Pulegol −82.5 −85.1 −98.8 −75.2 −66.7 −79.3\n(R)-Pulegone −84.0 −83.1 −96.1 −66.4 −65.5 −78.3\n(S)-Pulegone −83.6 −78.6 −93.3 −67.2 −66.2 −78.9\nRotundifolone −83.1 −79.0 −96.6 −66.4 −62.1 −80.7\n(+)-Sabinene −86.4 −84.0 −92.2 −70.5 −68.6 −77.4\n(-)-Sabinene −87.8 −85.9 −94.7 −71.5 −69.6 −77.0\ncis-Sabinene hydrate −82.4 −81.1 −92.4 −68.0 −60.8 −78.2\n(Z)-α-Santalol −105.7 −95.3 −108.8 −84.7 −70.7 −95.8\n(E)-β-Santalol −104.8 −95.6 −106.2 −77.0 −70.9 −86.6\n(Z)-β-Santalol −104.4 −94.4 −106.2 −79.8 −73.2 −92.2\nβ-Sesquiphellandrene −103.8 −99.0 −115.7 −84.8 −75.3 −101.1\nSpathulenol −90.7 −88.0 −98.4 −77.8 −67.9 −90.4\n(Z)-Spiroether −111.8 −84.9 −103.1 −87.1 −79.3 −102.0\nγ-Terpinene −81.3 −79.3 −93.2 −71.2 −65.3 −76.6\n(R)-Terpinen-4-ol −80.4 −81.9 −89.5 −69.0 −64.9 −75.3\n(S)-Terpinen-4-ol −82.1 −81.8 −88.0 −70.4 −64.4 −76.4\n(R)-α-Terpineol −82.6 −88.3 −91.6 −65.6 −66.0 −72.6\n(S)-α-Terpineol −88.7 −86.8 −94.1 −71.6 −63.5 −82.0\nTerpinolene −80.7 −80.1 −94.7 −68.8 −63.9 −77.4\n(-)-α-Thujone −87.2 −89.3 −94.5 −66.9 −69.2 −78.1\n(+)-β-Thujone −86.9 −80.5 −94.2 −73.7 −69.7 −79.2\nThymohydroquinone dimethyl ether −89.5 −82.8 −104.6 −73.1 −67.0 −85.0\nThymol −84.4 −87.5 −94.6 −72.9 −70.8 −78.4\n2-Undecanone −101.3 −94.0 −108.3 −78.4 −72.8 −90.2\nValencene −84.7 −81.7 −92.6 −74.4 −68.3 −81.7\n(+)-Verbenone −84.7 −73.2 −82.5 −68.4 −54.8 −71.2\n(-)-Verbenone −83.8 −77.7 −77.4 −65.4 −57.8 −68.0\nViridiflorene −86.8 −90.2 −91.0 −76.3 −69.4 −88.8\nα-Zingiberene −106.4 −100.5 −115.4 −82.7 −71.4 −98.6\na Human angiotensin-converting enzyme 2 (hACE2).\nTable 4 Normalized docking scores ( DSnorm, kJ/mol) of essential oil components with bovine odorant binding protein (BtOBP), cruzain, torpedo acetylcholinesterase (TcAChE), Bacillus anthracis nicotinate mononucleotide adenylytransferase (BaNadD), Russell’s viper phospholipase A2 (DrPLA2), and Escherichia coli l-aspartate aminotransferase (EcAspTA).\nCompound BtOBP Cruzain TcAChE BaNadD DrPLA2 EcAspTA\n1GT3 1ME3 6G1U 3HFJ 1FV0 2Q7W\n(E)-Anethole −90.2 −73.3 −96.8 −112.9 −85.3 −88.1\nallo-Aromadendrene −85.0 −70.6 −92.8 −105.8 −87.8 −79.6\nArtemiseole −84.8 −74.2 −84.2 −90.6 −68.0 −71.7\n(R)-Artemisia alcohol −88.4 −68.3 −89.5 −94.8 −80.7 −81.5\n(S)-Artemisia alcohol −86.1 −74.0 −94.8 −101.4 −82.5 −81.4\nArtemisia ketone −93.1 −77.3 −91.5 −107.9 −87.8 −80.6\nAscaridole −79.7 −54.4 −72.1 −79.7 −75.0 −65.3\nBenzyl benzoate −105.0 −82.8 −115.8 −128.1 −97.3 −89.9\n(Z)-trans-α-Bergamotol −1 00.7 −73.6 −107.0 −94.2 −92.6 −85.8\nBicyclogermacrene −97.5 −82.4 −95.6 −105.5 −89.7 −89.0\nBicyclosesquiphellandrene −92.2 −52.5 −91.2 −110.7 −88.4 −75.7\nα-Bisabolol oxide A −94.7 −66.1 −102.8 −102.6 −77.1 −82.7\nα-Bisabolol oxide B −104.6 −90.4 −107.0 −121.9 −94.2 −89.8\nBisabolone oxide A −100.1 −71.9 −96.8 −84.7 −81.2 −86.7\n(+)-Borneol −72.5 −51.0 −72.0 −47.8 −61.4 −62.5\n(-)-Borneol −78.3 −53.1 −70.8 −49.0 −63.3 −56.2\n(+)-iso-Borneol −73.7 −55.6 −74.6 −31.0 −60.9 −59.7\n(-)-iso-Borneol −73.2 −55.3 −77.7 −52.6 −51.0 −57.4\nα-Bulnesene −93.4 −89.3 −109.3 −115.7 −94.4 −95.3\nδ-Cadinene −79.5 −86.8 −105.1 −116.8 −94.8 −82.3\nΤ-Cadinol −87.8 −71.8 −117.7 −121.7 −86.0 −87.0\n(R)-Calamene −80.3 −84.4 −116.5 −120.4 −91.3 −87.7\n(S)-Calamene −80.1 −82.5 −116.2 −121.8 −93.0 −88.3\n(+)-Camphene −79.0 −62.1 −77.0 −75.9 −69.3 −67.5\n(-)-Camphene −77.7 −62.8 −75.2 −77.4 −71.3 −70.6\n(+)-Camphor −76.0 −57.0 −75.0 −49.0 −53.5 −54.1\n(-)-Camphor −80.0 −54.1 −74.4 −52.9 −61.2 −56.4\n(+)-δ-3-Carene −80.4 −64.2 −80.6 −88.0 −71.8 −72.5\n(-)-δ-3-Carene −82.0 −68.9 −84.4 −90.2 −72.8 −72.9\nCarvacrol −82.4 −77.7 −94.8 −106.7 −81.6 −87.5\nCarvacrol methyl ether −85.6 −79.3 −96.6 −111.5 −84.2 −93.6\n(+)-cis-Carveol −89.1 −77.3 −96.9 −109.4 −81.3 −87.6\n(-)-cis-Carveol −89.0 −82.1 −95.5 −109.0 −83.2 −89.4\n(R)-Carvone −86.0 −80.7 −94.6 −109.9 −83.5 −91.5\n(S)-Carvone −88.0 −77.2 −94.1 −105.9 −82.8 −87.2\n(E)-Caryophyllene −87.3 −60.4 −88.1 −87.3 −87.4 −78.6\nCaryophyllene oxide −95.1 −73.1 −90.1 −97.0 −83.8 −77.8\nCedrol −87.7 −63.1 −96.4 −84.4 −86.3 −70.9\nepi-Cedrol −84.0 −59.7 −83.3 −86.7 −80.0 −76.2\nChamazulene −95.2 −89.2 −123.0 −132.1 −98.9 −101.6\n(-)-cis-Chrystanthyl acetate −85.8 −63.7 −89.8 −73.8 −76.5 −71.5\n(-)-trans-Chrysanthenyl acetate −80.9 −69.7 −82.4 −78.5 −76.5 −68.6\n1,8-Cineole −69.3 −51.1 −73.2 −54.4 −49.4 −47.3\n(E)-Cinnamaldehyde −87.7 −77.6 −98.2 −110.1 −85.7 −89.5\n(E)-Cinnamyl acetate −95.9 −88.2 −107.4 −132.5 −94.6 −103.1\n(R)-Citronellal −98.1 −90.5 −109.3 −120.7 −88.3 −105.7\n(S)-Citronellal −95.0 −89.7 −108.5 −123.3 −86.9 −104.1\n(R)-Citronellol −91.0 −90.0 −108.2 −122.4 −88.6 −107.7\n(S)-Citronellol −92.5 −91.9 −108.5 −122.0 −90.3 −100.3\n(R)-Citronellyl formate −98.0 −93.5 −118.7 −129.5 −87.5 −108.5\n(S)-Citronellyl formate −99.7 −95.1 −111.2 −135.6 −91.5 −94.8\nα-Copaene −88.9 −69.9 −84.6 −78.7 −81.7 −61.9\nCostunolide −106.8 −87.5 −116.7 −120.1 −100.3 −89.1\n(R)-Cryptone −74.9 −68.1 −92.2 −100.0 −78.5 −80.8\n(S)-Cryptone −79.0 −68.5 −91.6 −100.7 −82.7 −79.6\nβ-Cubebene −99.8 −67.2 −106.9 −112.2 −93.9 −94.8\nCuminaldehyde −84.9 −79.1 −95.3 −109.1 −90.1 −89.5\nar-Curcumene −98.1 −87.5 −116.0 −125.7 −94.1 −95.3\nCurcumol −90.1 −67.6 −100.4 −88.0 −87.6 −81.5\nCurdione −96.4 −75.1 −99.3 −116.3 −91.0 −78.7\nCurzerene −96.4 −80.3 −109.4 −89.7 −91.1 −86.4\nm-Cymene −78.9 −73.1 −96.1 −99.1 −76.6 −88.0\no-Cymene −77.0 −61.9 −89.8 −97.8 −76.2 −77.2\np-Cymene −82.8 −73.2 −91.3 −96.8 −80.9 −84.3\n(E)-β-Damascenone −90.1 −80.5 −100.7 −105.4 −88.9 −80.0\n(2E,4E)-Decadienal −96.4 −87.0 −110.4 −129.7 −95.8 −114.8\nDodecanal −95.8 −83.7 −110.3 −127.3 −89.2 −108.9\nEremanthin −80.1 −87.9 −121.3 −132.4 −98.7 −91.8\nβ-Eudesmol −95.2 −76.1 −98.6 −114.1 −85.3 −87.1\nγ-Eudesmol −94.9 −78.2 −106.1 −105.2 −89.7 −89.1\nEugenol −90.4 −82.4 −103.9 −119.3 −87.3 −98.8\nEugenol methyl ether −93.6 −78.1 −106.3 −116.8 −89.3 −94.4\nEugenyl acetate −94.9 −83.4 −109.2 −126.1 −100.1 −104.6\n(E,E)-α-Farnesene −115.5 −103.7 −129.8 −131.8 −101.2 −111.4\n(E)-β-Farnesene −112.1 −103.2 −122.7 −131.8 −105.3 −108.6\n(E,E)-Farnesol −116.8 −96.2 −133.0 −135.6 −100.5 −109.0\n(+)-Fenchone −78.4 −60.5 −79.5 −79.8 −62.4 −69.9\n(-)-Fenchone −80.3 −61.5 −81.0 −84.2 −65.5 −60.7\nFlavesone −87.1 −56.0 −88.6 −92.1 −85.2 −80.3\nGeranial −96.5 −94.9 −111.7 −119.3 −92.1 −101.5\nGeraniol −95.5 −93.6 −109.7 −118.0 −94.3 −107.3\nGeranyl formate −100.2 −89.7 −115.4 −128.3 −94.8 −114.1\nGermacrene D −102.4 −88.8 −109.9 −116.5 −93.7 −90.0\nGermacrone −92.4 −68.3 −94.5 −102.9 −88.3 −80.0\nGuiaol −100.8 −88.5 −113.3 −107.5 −92.6 −94.0\nα-Gurjunene −80.6 −61.6 −84.6 −100.0 −83.6 −78.1\nβ-Gurjunene −89.3 −38.8 −80.3 11.3 −77.6 −71.1\nα-Himachalene −89.2 −67.9 −83.9 −96.3 −87.6 −73.4\nβ-Himachalene −81.9 −65.4 −96.1 −110.8 −91.4 −76.8\nHimachalol −91.5 −64.1 −81.2 −24.7 −81.7 −66.3\nα-Humulene −94.0 −80.0 −89.9 −113.6 −89.2 −82.5\nLeptospermone −89.6 −64.0 −92.2 −102.7 −88.8 −80.7\niso-Leptospermone −92.8 −63.0 −90.1 −99.4 −86.2 −78.2\n(R)-Limonene −86.2 −75.7 −92.4 −99.6 −81.7 −86.8\n(S)-Limonene −84.9 −77.6 −93.4 −99.8 −83.3 −87.3\n(R,S,R)-Limonene oxide −87.1 −76.0 −93.2 −110.7 −84.9 −86.3\n(S,R,R)-Limonene oxide −84.6 −68.8 −85.0 −84.3 −76.2 −69.8\n(S,R,S)-Limonene oxide −91.2 −73.8 −97.4 −93.6 −85.1 −87.9\n(R)-Linalool −95.5 −89.9 −116.6 −112.4 −90.3 −89.9\n(S)-Linalool −93.0 −88.9 −110.1 −111.9 −91.0 −95.7\n(R)-Linalyl acetate −96.9 −87.1 −107.1 −112.5 −87.1 −95.2\n(S)-Linalyl acetate −100.0 −90.5 −110.2 −114.3 −86.6 −87.1\np-Mentha-1(7),8-diene −83.3 −74.4 −93.6 −100.0 −82.9 −84.9\n(+)-Menthol −86.1 −66.4 −98.6 −106.1 −79.2 −90.8\n(-)-Menthol −81.0 −68.9 −97.5 −106.3 −80.5 −89.7\nMenthone −82.4 −72.0 −92.6 −98.2 −82.8 −83.5\niso-Menthone −79.9 −64.8 −88.2 −102.4 −75.1 −82.0\nα-Muurolene −91.2 −79.9 −95.6 −113.7 −90.0 −82.8\n(+)-γ-Muurolene −85.2 −77.0 −98.7 −113.9 −93.2 −78.7\n(-)-γ-Muurolene −83.1 −83.4 −96.9 −106.3 −82.9 −80.5\nMyrcene −90.4 −88.8 −109.0 −112.7 −90.3 −101.1\nNeral −95.1 −94.1 −111.1 −122.8 −90.9 −105.4\n(E)-Nerolidol −111.5 −101.8 −131.9 −131.3 −99.6 −110.5\n(E)-β-Ocimene −91.8 −89.4 −104.6 −116.4 −89.0 −97.0\n(Z)-β-Ocimene −89.7 −90.6 −106.8 −112.1 −90.3 −94.4\nOctanal −85.8 −79.8 −97.6 −112.0 −85.7 −102.7\n(R)-2-Octen-3-ol −84.3 −81.5 −106.9 −107.1 −83.3 −101.1\n(S)-1-Octen-3-ol −84.5 −82.4 −108.4 −105.9 −85.0 −99.5\n3-Octanone −84.2 −82.5 −102.6 −111.6 −82.9 −101.8\nPatchouli alcohol −75.1 −41.4 −71.1 100.1 −10.1 −49.2\n(R)-Phellandral −92.3 −79.3 −97.4 −108.1 −88.9 −89.5\n(S)-Phellandral −92.9 −79.9 −96.1 −109.2 −88.9 −88.8\n(R)-α-Phellandrene −84.0 −69.7 −94.7 −100.8 −82.4 −83.8\n(S)-α-Phellandrene −84.3 −69.6 −93.5 −99.4 −82.6 −80.6\n(R)-β-Phellandrene −82.2 −69.9 −93.5 −102.0 −80.6 −84.1\n(S)-β-Phellandrene −83.8 −69.0 −93.2 −100.5 −80.2 −81.2\nPhytol −112.8 −93.8 −132.4 −134.7 −102.4 −112.9\nPhytone −117.8 −92.1 −124.5 −131.1 −99.7 −107.2\n(+)-α-Pinene −74.2 −58.0 −73.4 −62.4 −62.5 −54.4\n(-)-α-Pinene −72.8 −58.3 −70.4 −64.6 −61.7 −57.2\n(+)-β-Pinene −70.9 −57.8 −74.0 −64.1 −60.9 −55.5\n(-)-β-Pinene −73.5 −58.4 −73.1 −65.0 −63.7 −57.0\n(+)-Pinocamphone −76.5 −58.2 −73.6 −53.1 −55.4 −63.6\n(-)-Pinocamphone −76.6 −66.1 −76.5 −65.9 −72.3 −62.7\n(+)-iso-Pinocamphone −75.3 −59.0 −76.6 −54.0 −59.1 −58.1\n(-)-iso-Pinocamphone −76.2 −59.6 −76.7 −56.4 −65.8 −56.2\n(+)-cis-Pinocarveol −75.7 −58.2 −75.2 −51.7 −57.5 −58.1\n(-)-cis-Pinocarveol −75.7 −63.9 −73.5 −52.5 −66.3 −54.5\n(+)-trans-Pinocarveol −77.5 −60.6 −76.5 −71.1 −63.9 −61.4\n(-)-trans-Pinocarveol −72.4 −58.6 −77.2 −71.4 −56.3 −62.6\n(+)-Piperitone oxide −88.5 −70.5 −100.5 −104.2 −80.4 −78.0\n(-)-Piperitone oxide −86.0 −73.6 −99.6 −104.5 −80.7 −83.8\n(-)-iso-Pulegol −85.1 −72.0 −93.5 −106.7 −83.5 −93.8\n(R)-Pulegone −81.8 −69.9 −90.3 −103.9 −78.4 −74.4\n(S)-Pulegone −79.7 −69.6 −89.3 −99.9 −81.5 −76.4\nRotundifolone −86.1 −72.1 −96.1 −100.0 −82.4 −72.1\n(+)-Sabinene −87.9 −66.6 −84.5 −92.1 −80.5 −78.2\n(-)-Sabinene −79.7 −68.4 −91.4 −96.0 −80.8 −75.8\ncis-Sabinene hydrate −88.1 −70.2 −84.5 −91.1 −72.3 −68.1\n(Z)-α-Santalol −108.5 −85.6 −113.4 −106.8 −96.8 −90.7\n(E)-β-Santalol −105.0 −90.2 −110.6 −113.3 −94.3 −94.0\n(Z)-β-Santalol −108.0 −85.3 −110.4 −110.9 −96.5 −92.6\nβ-Sesquiphellandrene −103.9 −92.2 −116.6 −127.5 −99.4 −98.3\nSpathulenol −95.9 −94.8 −97.7 −102.8 −84.3 −102.2\n(Z)-Spiroether −112.8 −85.5 −124.3 −136.1 −101.5 −102.9\nγ-Terpinene −84.3 −74.9 −93.4 −98.7 −82.8 −85.9\n(R)-Terpinen-4-ol −87.3 −66.7 −81.5 −94.0 −80.2 −72.2\n(S)-Terpinen-4-ol −87.1 −67.2 −78.9 −92.3 −80.2 −71.7\n(R)-α-Terpineol −82.0 −68.0 −80.3 −82.2 −77.6 −71.3\n(S)-α-Terpineol −76.9 −75.5 −103.6 −101.7 −86.6 −84.9\nTerpinolene −83.1 −69.8 −89.0 −101.8 −84.8 −72.9\n(-)-α-Thujone −81.4 −66.2 −84.9 −93.4 −72.6 −74.1\n(+)-β-Thujone −87.6 −66.4 −89.9 −102.9 −71.7 −86.9\nThymohydroquinone dimethyl ether −86.3 −75.8 −103.7 −116.0 −85.3 −95.5\nThymol −84.4 −70.8 −96.4 −107.1 −79.7 −91.8\n2-Undecanone −94.5 −90.2 −110.0 −129.7 −91.9 −107.6\nValencene −96.7 −75.1 −103.3 −114.7 −87.8 −76.6\n(+)-Verbenone −74.3 −64.5 −79.3 −71.6 −63.9 −72.3\n(-)-Verbenone −73.5 −63.1 −78.0 −65.3 −64.8 −59.3\nViridiflorene −81.9 −68.6 −102.1 −106.9 −73.1 −81.9\nα-Zingiberene −108.3 −90.9 −113.8 −123.4 −97.7 −99.9 "}

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Oils as Antiviral Agents, Potential of Essential Oils to Treat SARS-CoV-2 Infection: An In-Silico Investigation\n\nAbstract\nEssential oils have shown promise as antiviral agents against several pathogenic viruses. In this work we hypothesized that essential oil components may interact with key protein targets of the 2019 severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2). A molecular docking analysis was carried out using 171 essential oil components with SARS-CoV-2 main protease (SARS-CoV-2 Mpro), SARS-CoV-2 endoribonucleoase (SARS-CoV-2 Nsp15/NendoU), SARS-CoV-2 ADP-ribose-1″-phosphatase (SARS-CoV-2 ADRP), SARS-CoV-2 RNA-dependent RNA polymerase (SARS-CoV-2 RdRp), the binding domain of the SARS-CoV-2 spike protein (SARS-CoV-2 rS), and human angiotensin−converting enzyme (hACE2). The compound with the best normalized docking score to SARS-CoV-2 Mpro was the sesquiterpene hydrocarbon (E)-β-farnesene. The best docking ligands for SARS−CoV Nsp15/NendoU were (E,E)-α-farnesene, (E)-β-farnesene, and (E,E)−farnesol. (E,E)−Farnesol showed the most exothermic docking to SARS-CoV-2 ADRP. Unfortunately, the docking energies of (E,E)−α-farnesene, (E)-β-farnesene, and (E,E)−farnesol with SARS-CoV-2 targets were relatively weak compared to docking energies with other proteins and are, therefore, unlikely to interact with the virus targets. However, essential oil components may act synergistically, essential oils may potentiate other antiviral agents, or they may provide some relief of COVID-19 symptoms.\n\n1. Introduction\nThe 2019 severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) is a newly emerging respiratory illness. The epidemic started in December 2019 in Wuhan, China, and has rapidly spread throughout China and the world and is now a global pandemic. SARS-CoV-2 can be efficiently transmitted among humans and has shown a high degree of morbidity and mortality [1,2]. As of April 20, 2020, the worldwide number of infected individuals was 2,544,792, with as many as 175,694 deaths [3]. There are currently no approved vaccines available for the prevention of SARS-CoV-2 infection and only just recently, remdesivir has received “emergency use authorization” for treatment of COVID-19 in the United States; therefore, there is an urgent demand for potential chemotherapeutic agents to treat this disease.\nEssential oils have been screened against several pathogenic viruses (Table 1), including influenza and other respiratory viral infections. Influenza is an infectious respiratory disease caused by one of three types of influenza viruses, type A, type B, or type C [4]. The most significant in terms of human morbidity and mortality is influenza virus type A, which is found in several bird and mammal species [5]. Several different serotypes of influenza type A have caused global flu pandemics [6]: H1N1, which caused the Spanish flu in 1918 (40–50 million deaths worldwide) [7] and the swine flu in 2009 [8]; the Asian flu of 1957–1958 (ca. 1.5 million deaths worldwide) was caused by influenza A H2N2 [8]; serotype H3N2 caused the Hong Kong flu in 1968 [9]; and H5N1, which caused the bird flu in 2004 [10]. Influenza virus type B, however, is largely confined to human hosts [11].\nOne study evaluated the in vitro antiviral effect against influenza type A (H1N1) of commercial essential oils that included cinnamon (Cinnamomum zeylanicum), bergamot (Citrus bergamia), lemongrass (Cymbopogon flexuosus), thyme (Thymus vulgaris), and lavender (Lavandula angustifolia). The oils were tested in the liquid phase at a concentration of 0.3% and in the vapor phase. The oils of cinnamon, bergamot, thyme, and lemongrass displayed 100% inhibition of H1N1 in the liquid phase, while the inhibition for lavender essential oil was 85%. However, in the vapor phase, 100% inhibition was observed only for cinnamon leaf essential oil after 30 min of exposure. The bergamot, lemongrass, thyme, and lavender essential oils displayed inhibition rates of 95%, 90%, 70%, and 80%, respectively [12].\nCinnamomum zeylanicum leaf oil is characterized by eugenol (75–85%), followed by smaller amounts of linalool (1.6–8.5%), and benzyl benzoate (0.1–8.3%) [13,14,15]. Bergamot oil is rich in limonene (23–55%), linalool (2–37%), and linalyl acetate (12–41%), with lesser quantities of β-pinene (up to 10%) and γ-terpinene (up to 10%) [16,17,18,19,20]. Geranial (48–54%) and neral (29–33%) have been reported as the major components of C. flexuosus, but many chemotypes, cultivars, and variants have been reported for C. flexuosus [21,22].\nIn the literature, there have been at least 20 different chemotypes identified for thyme essential oil. The “typical” thyme essential oil presents a thymol content of 45% (range 31–50%), with significant concentrations of p-cymene (0.1–26.6%, average = 15.6%) and γ-terpinene (up to 22.8%, average = 9.3%). In addition, there are several other chemotypes of T. vulgaris rich in thymol and/or carvacrol [23]. Thymol has been identified as an anti-influenza agent against influenza type A and parainfluenza type 3 virus [24,25]. Lavandula angustifolia essential oil is rich in linalyl acetate (37.0–43.6%), linalool (19.7–39.1%), geraniol (up to 9.3%), β-caryophyllene (up to 5.1%), terpinen-4-ol (up to 14.9%), lavandulyl acetate (up to 5.5%), and borneol (up to 6.4%) [26,27,28,29].\nAnother essential oil with notable anti-influenza effects is tea tree, which is extracted from the leaves of Melaleuca alternifolia (Myrtaceae). Commercial tea tree oil is composed of terpinen-4-ol (30–48%), γ-terpinene (10–28%), α-terpinene (5–13%), 1,8-cineole (up to 15%), terpinolene (1.5–5%), p-cymene (0.5–12%), α-pinene (1–6%), and α-terpineol (1.5–8%) [30]. Tea tree oil showed 100% inhibition of influenza type A (H1N1) virus at 0.01% concentration and a median inhibitory concentration (IC50) of 6 μg/mL [31,32]. In addition, 30 min exposure of type A (H11N9) virus to tea tree oil vapor caused 100% inhibition [33]. The tea tree oil components, terpinen-4-ol, terpinolene, and α-terpineol, have shown anti-influenza virus activity against type A (H1N1), with IC50 values of 25, 12, and 250 μg/mL, respectively. α-Terpinene, γ-terpinene, and p-cymene were inactive, however [31].\nAvian influenza viruses (H5N1) exhibit both high and low virulence in numerous mammalian species, highlighting the connection between the route of inoculation and virus pathogenicity [34]. Since 2003, there have been over 600 documented cases of human infection with H5N1 viruses, with most cases among young, previously healthy individuals [35]. The essential oils extracted from Citrus reshni leaves and peel (unripe and ripe fruits) were tested against H5N1 virus by plaque reduction assay. The oils showed moderate inhibition of the H5N1 virus at a concentration of 2.5 μL/mL. Sabinene (40.5%), linalool (23.3%), and terpinen-4-ol (8.3%) were the main constituents in the leaf oil while limonene (82.4%, 91.6%) was the main compound in the fruit peel essential oils (unripe and ripe, respectively) [36].\nThe essential oil of leaves of Fortunella margarita is rich in the sesquiterpenoids β-eudesmol (28.3%), α-muurolene (10.3%), β-gurjunene (10.0%), γ-eudesmol (8.4%), and γ-muurolene (6.6%) while the essential oil extracted from the fruits showed monterpenoids as the main components, α-terpineol (55.5%), carvone (5.7%), and carveol (5.5%). Both samples were tested for antiviral activity against avian influenza (H5N1) virus, and the obtained results revealed that the fruit essential oil was more effective (80% virus inhibition by the MTT (3-(4,5-dimethylthiazol-2-yl)-2,5-diphenyltetrazolium bromide) assay using Madin−Darby canine kidney (MDCK) cells for virus propagation). The IC50 values obtained for the leaf and fruit essential oils were 38.89 and 6.77 μg/mL, respectively [53].\nDengue fever, a mosquito−borne disease, is caused by dengue virus (DENV) which includes four major serotypes (DENV-1, -2, -3, and -4). Some serotypes cause more severe diseases than others; severe dengue is associated with secondary infections by a different serotype. Dengue disease is a major public health problem in developing tropical countries and has being continuously spreading to new geographical areas [92]. The essential oils of two species of Lippia were assayed against four dengue serotypes (DENV-1, DENV-2, DENV-3, DENV-4) [61]. The IC50 values for Lippia alba oil, rich in carvone (39.7%), limonene (30.6%), and bicyclosesquiphellandrene (8.9%), were between 0.4 and 32.6 μg/mL. However, the Lippia citrodora essential oil, composed of geranial (18.9%), neral (15.6%), limonene (10.7%), and 1,8-cineole (5.0%), showed the best activity, with IC50 values varying from 1.9 to 33.7 μg/mL. No viral inhibitory effect was observed by addition of the essential oil after virus adsorption; the inhibitory effect of the essential oil seemed to cause direct virus inactivation before adsorption on the host cell.\nThe essential oils of seven aromatic plants from Córdoba, San Luis, and San Juan provinces (Argentina) were screened for cytotoxicity and in vitro inhibitory activity against dengue virus type 2 (DENV−2) [38]. The oils of Jungia polita and Buddleja cordobensis were composed of caryophyllene oxide (9.18%, 32.1%) and β-caryophyllene (8.13%, 16.5%) as the major compounds. However, these oils displayed different IC50 values (86.4 and 39.8 μg/mL, respectively). The other samples were composed mostly of monoterpenes and displayed lower activity, except Pectis odorata oil, which presented limonene (50.2%), neral (27.2%), and geranial (23.6%) as the major compounds and an IC50 value of 39.6 μg/mL. In addition, the essential oils of Artemisia mendozana, rich in camphor (22.4%), artemisole (11.7%), and artemisia alcohol (10.8%); Gailardia megapotamica composed of β-pinene (35.5%), spathulenol (10.7%), and germacrene D (6.8%); and Heterothalamus alienus characterized by β-pinene (35.5%), spathulenol (10.7%), and germacrene D (6.8%), showed an average IC50 value of 130.63 μg/mL.\nYellow fever (YF), caused by yellow fever virus (YFV), has historically been considered one of the most dangerous infectious diseases. YFV is transmitted to humans via mosquitoes of the Haemogogus, Sabethes, and Aedes genera. Annually, there are approximately 80,000–200,000 YFV cases worldwide, with a case fatality rate (CFR) ranging from 20–60% [93,94]. Essential oils of Lippia species and their main compounds have been tested against yellow fever virus (YFV) in Vero cells. The oil of Lippia origanoides showed carvacrol (44.0%), thymol (15.0%), and γ-terpinene (10.0%) as the main compounds and displayed 100% inhibition at a concentration of 11.1 μg/mL [43]. However, in the same study, the oil of L. alba displayed 100% inhibition at a concentration of 100.0 μg/mL. The major compounds were carvone (51.0%), limonene (33.0%), and bicyclosesquiphellandrene (7.0%). The essential oil of L. alba with a similar chemical composition, carvone (39.7%), limonene (30.6%), and bicyclosesquiphellandrene (8.9%), displayed an IC50 value of 4.3 μg/mL against YFV when tested in Vero cells using the MTT assay [62]. The essential oil of L. citriodora, dominated by geranial (18.9%), neral (15.6%), and limonene (10.7%), did not display a statistical difference in comparison to citral, with IC50 values of 19.4 and 17.6 μg/mL, respectively [62].\nIn addition to essential oils, several individual essential oil components have been screened for antiviral activity (Table 2).\nBecause of the activities of several essential oils and essential oil components against human pathogenic viruses, we hypothesized that essential oil components may be potentially useful as antiviral agents against SARS-CoV-2. In this work, we carried out a molecular docking analysis of the major components of essential oils that exhibit antiviral activity (Table 1 and Table 2) with known SARS-CoV-2 protein targets.\n\n2. Results and Discussion\nSeveral proteins have been identified for severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2), which may serve as potential targets for chemotherapeutic intervention in coronavirus disease 2019 (COVID-19). These protein targets include SARS-CoV-2 main protease (SARS-CoV-2 Mpro), SARS-CoV-2 endoribonucleoase (SARS-CoV-2 Nsp15/NendoU), SARS-CoV-2 ADP−ribose−1″−phosphatase (SARS-CoV-2 ADRP), SARS-CoV-2 RNA-dependent RNA polymerase (SARS-CoV-2 RdRp), the binding domain of the SARS-CoV-2 spike protein (SARS-CoV-2 rS), and human angiotensin−converting enzyme (hACE2). There have already been several molecular docking studies on these macromolecular targets. Several groups have carried out molecular docking of natural product libraries with SARS-CoV-2 Mpro [102,103,104,105]. Additionally, commercially available drugs have also been examined using in silico methods [106,107].\nA molecular docking study was carried out with 171 essential oil components with SARS-CoV-2 Mpro (PDB: 5R7Z, 5R80, 5R81, 5R82, 5R83, 5R84, 6LU7, 6M03, and 6Y84), SARS-CoV-2 Nsp15/NendoU (PDB: 6VWW, 6W01, and 6W02), SARS-CoV-2 rS (PDB: 6M0J, 6M17, 6VX1, and 6VW1), and SARS-CoV-2 RdRp (PDB: 6M71). The best docking scores are summarized in Table 3.\nThe main protease, SARS-CoV-2 Mpro, is a cysteine protease that is essential for processing the polyproteins that are translated from the coronavirus RNA [108]. The substrate binding site of the enzyme is a cleft flanked by Gln189, Met49, Pro168, Glu166 and His41; the active site is Cys145 and His41. The compound with the best normalized docking score to SARS-CoV-2 Mpro was the sesquiterpene hydrocarbon (E)-β-farnesene (DSnorm = −115.4 kJ/mol). Other essential oil components showing good docking scores with SARS-CoV-2 Mpro were (E,E)-α-farnesene (DSnorm = −115.0 kJ/mol), (E,E)-farnesol (DSnorm = −112.4 kJ/mol), and (E)-nerolidol (DSnorm = −110.7 kJ/mol). The sesquiterpene hydrocarbons (E,E)-α-farnesene and (E)-β-farnesene occupy the substrate binding site, flanked by Gln189, Arg188, Met165, His41, and Asp 187 (Figure 1). The lowest-energy docked poses of both (E,E)-farnesol and (E)-nerolidol showed hydrogen bonding of the alcohol moiety to Gln192 and Thr190 and, in the case of (E)-nerolidol, also with GLN189 and ARG188 (Figure 2).\nNon-structural protein 15 (Nsp15) of SARS-CoV-2 is an endoribonuclease that preferentially cleaves RNA at uridylate. Furthermore, it has been shown that SARS-CoV Nsp15/NendoU is required for successful viral infection [109]. The best docking ligands for SARS-CoV Nsp15/NendoU are (E,E)-α-farnesene (DSnorm = −107.5 kJ/mol), (E)-β-farnesene (DSnorm = −105.0 kJ/mol), (E,E)-farnesol (DSnorm = −104.6 kJ/mol), and (E)-nerolidol (DSnorm = −101.6 kJ/mol). All of these sesquiterpenoids preferentially docked into a binding site formed by amino acid residues Gln347, Ile328, Val276, Ser274, Thr275, Ser329, Asn74, Asn75, Glu327, and Lys71 (Figure 3). In addition to van der Waals interactions, (E,E)-farnesol showed hydrogen-bonding interactions with Ser329 and Glu327, while (E)-nerolidol hydrogen bonded with Asn75 and Lys71 (Figure 3). Unfortunately, the docking scores for these ligands as well as the scores of the other essential oil components with this protein are too low for it to be considered a viable target (see Table 3).\nADP ribose phosphatase (ADRP) serves to convert ADP-ribose 1″-monophosphate (Appr-1″-p) to ADP-ribose (Appr), which serves to regulate virus replication [110]. This enzyme may be dispensable in SARS-CoV-2, however [111]. Nevertheless, (E,E)-farnesol showed the most exothermic docking to SARS-CoV-2 ADRP with DSnorm = −121.4 kJ/mol. The binding site in SARS-CoV-2 ADRP is surrounded by Phe132, Asn40, Ile131, Ala38, and Ala39, with hydrogen-bonded interactions between the ligand alcohol and Asn40 (Figure 4). Additional essential oil components with good docking scores with SARS-CoV-2 ADRP include the sesquiterpene hydrocarbons (E)-β-farnesene (DSnorm = −116.3 kJ/mol), (E,E)-α-farnesene (DSnorm = −114.2 kJ/mol), β-sesquiphellandrene (DSnorm = −115.7 kJ/mol), and α-zingiberene (DSnorm = −115.4 kJ/mol); the diterpenoids phytol (DSnorm = −118.9 kJ/mol) and phytone (DSnorm = −116.9 kJ/mol); and the phenylpropanoid eugenyl acetate (DSnorm = −115.4 kJ/mol). Not surprisingly, β-sesquiphellandrene and α-zingiberene adopted the same docking orientation in the binding site of the enzyme (Figure 5A). Similarly, phytol and phytone occupy the same location in the binding site (Figure 5B).\nRNA-dependent RNA polymerase catalyzes RNA replication from an RNA template and is an essential enzyme in RNA viruses. Because these enzymes are crucial in viral replication, they are viable targets in antiviral chemotherapy [112]. Molecular docking of essential oil components with SARS-CoV-2 RdRp showed only weak docking with this enzyme target (Table 3). The ligand with the best docking score was (E,E)-farnesol, with DSnorm = −89.6 kJ/mol.\nThe SARS-CoV-2 spike protein serves to attach to angiotensin-converting enzyme 2 (ACE2) of the human cell to be invaded. The interface between SARS-CoV-2 rS and human ACE2 would be a promising target to prevent binding of SARS-CoV-2 rS to human ACE2 [113,114]. The best docking ligands with human ACE2, i.e., normalized docking scores \u003c -100 kJ/mol (α-bulnesene, eremanthin, (E,E)-α-farnesene, (E)-β-farnesene, (E,E)-farnesol, (E)-nerolidol, β-sesquiphellandrene, and (Z)-spiroether), all show docking preference to a cavity removed from the interaction interface between the SARS-CoV-2 spike protein and ACE2 (Figure 6). This cavity is a pocket surrounded by residues Pro565, Leu95, Val209, Asn210, Leu91, Lys94, Glu208, and Glu564. Because of the remote location of docking with ACE2, it is predicted that interaction of essential oil components with ACE2 will not prevent protein–protein interaction between the SARS-CoV-2 spike protein and human ACE2.\nOn the other hand, the lowest energy poses of essential oil components showing the strongest docking (\u003c−80 kJ/mol; (E)-cinnamyl acetate, eremanthin, (E,E)-α-farnesene, (E)-β-farnesene, (E,E)-farnesol, and geranyl formate) with the binding domain of the SARS-CoV-2 spike protein do lie at the interface between the SARS-CoV-2 spike protein and human ACE2 (Figure 6). This docking site is a hydrophobic pocket formed by Tyr505, Tyr495, Asn501, Arg403, Tyr453, and Gly502. Unfortunately, the docking energies at this site are too weak and are unlikely, therefore, to disrupt binding between SARS-CoV-2 rS and human ACE2.\nIn order to compare docking scores of the essential oil components with other proteins, docking was also carried out with six randomly selected non-virus proteins: Bovine odorant binding protein (BtOBP, PDB: 1GT3), cruzain (PDB: 1ME3), torpedo acetylcholinesterase (TcAChE, PDB: 6G1U), Bacillus anthracis nicotinate mononucleotide adenylytransferase (BaNadD, PDB: 3HFJ), Russell’s viper phospholipase A2 (DrPLA2, PDB: 1FV0), and Escherichia coli l-aspartate aminotransferase (EcAspTA, PDB: 2Q7W). Docking scores for these proteins are summarized in Table 4.\nThe docking results of the essential oil components with the six randomly selected proteins indicate the best docking ligands to SARS-CoV-2 targets (i.e., (E,E)-α-farnesene, (E)-β-farnesene, and (E,E)-farnesol) have better docking energies with other proteins. These three sesquiterpenes have docking energies of −129.8, −122.7, and −133.0 kJ/mol with TcAChE, respectively, and −131.8, −131.8, and −135.6 kJ/mol, respectively, with BaNadD. Indeed, most of the essential oil ligands have better docking properties with one or more of the random proteins compared to the SARS-CoV-2 proteins.\nBased on the docking energies of essential oil components with key protein targets of SARS-CoV-2, the individual essential oil components cannot be considered viable chemotherapeutic agents for interaction with the SARS-CoV-2 target proteins. However, essential oils are complex mixtures of compounds and several essential oil components may act synergistically to inhibit the virus. Astani and co-workers have shown, for example, that the antiviral activity (HSV-1) of Eucalyptus oil is much greater than the major component 1,8-cineole, and that tea tree oil has a greater antiviral activity than its components terpinen-4-ol, γ-terpinene, and α-terpinene [52].\nSynergistic effects have also been observed between essential oils and synthetic antiviral agents. Civitelli and co-workers observed an antiviral synergism between Mentha suaveolens essential oil and acyclovir on HSV-1 [64]. Likewise, Melissa officinalis essential oil potentiated the activity of oseltamivir against avian influenza virus H9N2 [115]. Furthermore, essential oils are lipophilic and therefore may also serve to disintegrate viral membranes [116].\nOutside of antiviral activity, there may be some relief of symptoms of COVID-19 provided by essential oils. For example, linalool [117,118], β-caryophyllene [119,120], and 1,8-cineole [121,122] have both anti-inflammatory and antinociceptive activity; menthol [123,124], camphor [125,126], and thymol [127] have antitussive activities.\n\n3. Materials and Methods\n\n3.1. Bibliographic Search Criteria\nThe bibliographic research was performed using the databases Google Scholar, Pubmed, Science Direct, Medline, and Scopus. The keywords applied were “antiviral activity” and “essential oils”, “antiviral activity” and “volatile compounds”, and “essential oils” and “respiratory diseases”.\n\n3.2. Ligand Selection\nThe major components (\u003e5%) of essential oils and pure essential oil components that have been screened against human pathogenic viruses were selected. In the case where enantiomers are known to be natural products, both structures were selected. A total of 171 essential oil components were used in the virtual screening.\n\n3.3. Molecular Docking\nEach ligand structure was prepared using Spartan ’18 v. 1.4.4 (Wavefunction, Inc., Irvine, CA, USA). The lowest-energy conformations of the ligands were determined and used as starting structures in the molecular docking. This is particularly important to include all potential conformations in medium-sized rings where interconversion between conformations may be hindered (e.g., bicyclogermacrene, costunolide, curdione, germacrene D, germacrone, and α-humulene). A total of six protein targets of SARS-CoV-2 from the Protein Data Bank (PDB), represented by a total of 17 structures, were used in the molecular docking, including SARS-CoV-2 main protease (PDB: 5R7Z, 5R80, 5R81, 5R82, 5R83, 5R84, 6LU7, 6M03, and 6Y84), SARS-CoV-2 endoribonuclease (PDB: 6VWW), SARS-CoV-2 ADP ribose phosphatase (PDB: 6W01 and 6W02), SARS-CoV-2 RNA-dependent RNA polymerase (PDB: 6M71), SARS-CoV-2 spike protein binding domain (PDB: 6M0J, 6VX1, 6VW1, and 6M17), and the human angiotensin-converting enzyme (PDB: 6M0J, 6VX1, 6VW1, and 6M17). Molecular docking was carried out using Molegro Virtual Docker v. 6.0.1 (Aarhus, Denmark) as previously reported [128,129]. Briefly, a 15-Å radius sphere centered on the binding sites of each protein structure in order to permit each ligand to search. In the case of the spike protein and human ACE2, the docking sphere was located at the interface between the spike protein and ACE2. In one case, ACE2 was removed and docking was carried out with the spike protein, and in the other case, the spike protein was removed and docking was carried out with ACE2. Standard protonation states of each protein, based on neutral pH, were used, and charges were assigned based on standard templates as part of the Molegro Virtual Docker program. Each protein was used as a rigid model without protein relaxation. Flexible-ligand models were used in the docking optimizations. Different orientations of the ligands were searched and ranked based on their “rerank” energy scores. A minimum of 100 runs for each ligand was carried out. In analyzing the docking scores, we accounted for the recognized bias due to molecular weight [130,131,132] using the scheme: DSnorm = 7.2 × Edock/MW⅓, where DSnorm is the normalized docking score, Edock is the MolDock re-rank score, MW is the molecular weight, and 7.2 is a scaling constant to ensure the average DSnorm values are comparable to those of Edock [128]. The best docking results are summarized in Table 1.\n\n4. Conclusions\nA molecular docking analysis was carried out using 171 essential oil components with the SARS-CoV-2 main protease (SARS-CoV-2 Mpro), SARS-CoV-2 endoribonucleoase (SARS-CoV-2 Nsp15/NendoU), SARS-CoV-2 ADP-ribose-1″-phosphatase (SARS-CoV-2 ADRP), SARS-CoV-2 RNA-dependent RNA polymerase (SARS-CoV-2 RdRp), the binding domain of the SARS-CoV-2 spike protein (SARS-CoV-2 rS), and human angiotensin-converting enzyme (hACE2). The best docking ligands for the SARS-CoV target proteins were (E,E)-α-farnesene, (E)-β-farnesene, and (E,E)-farnesol. The docking energies were relatively weak, however, and are unlikely to interact with the virus targets. However, essential oil components may act synergistically, essential oils may potentiate other antiviral agents, or they may provide some relief of COVID-19 symptoms.\n\nAcknowledgments\nW.N.S. participated in this work as part of the activities of the Aromatic Plant Research Center 237 (APRC, https://aromaticplant.org/).\n\nAuthor Contributions\nConceptualization, J.K.R.d.S., K.G.B., and W.N.S.; methodology, J.K.R.d.S., K.G.B., and W.N.S.; formal analysis, W.N.S.; investigation, J.K.R.d.S., P.L.B.F., K.G.B., and W.N.S.; data curation, W.N.S.; writing—original draft preparation, J.K.R.d.S. and W.N.S.; writing—review and editing, J.K.R.d.S., P.L.B.F., K.G.B., and W.N.S.; project administration, W.N.S.; All authors have read and agreed to the published version of the manuscript.\n\nFunding\nThis research received no external funding.\n\nConflicts of Interest\nThe authors declare no conflict of interest. Abbreviations\nAdeno Adenovirus\nAIV Avian influenza virus\nBaNadD Bacillus anthracis nicotinate mononucleotide adenylytransferase\nBtOBP Bovine odorant binding protein\nCOVID-19 Coronavirus disease 2019\nCox B1 Coxsackie B1 virus\nDENV-1 Dengue virus serotype 1\nDENV-2 Dengue virus serotype 2\nDENV-3 Dengue virus serotype 3\nDENV-4 Dengue virus serotype 4\nDrPLA2 Russell’s viper phospholipase A2\nDSnorm Normalized docking score\nEcAspTA Esherichia coli L-aspartate aminotransferase\nECHO 9 Echovirus 9\nhACE2 Human angiotensin-converting enzyme\nHeLa Human cervical tumor cells\nHEp-2 Human epithelial type 2 cells\nHRSV Human respiratory syncytial virus\nHSV-1 Herpes simplex virus 1\nHSV-2 Herpes simplex virus 2\nIC50 Median inhibitory concentration\nJUNV Junin virus\nMDCK Madin-Darby canine kidney cells\nMTT 3-(4,5-dimethylthiazol-2-yl)-2,5-diphenyltetrazolium bromide\nPCR Polymerase chain reaction\nPDB Protein data bank\nPolio 1 Poliomyelitis virus 1\nRC-37 African green monkey kidney cells\nSARS-CoV-2 2019 severe acute respiratory syndrome coronavirus 2\nTcAChE Torpedo acetylcholinesterase\nVero African green monkey kidney cells\nYFV Yellow fever virus\n\nFigure 1 Lowest-energy docked poses of (E)-β-farnesene and (E,E)-α-farnesene with the SARS-CoV-2 main protease (PDB: 6LU7). (A) Ribbon structure of the enzyme and (E)-β-farnesene. (B) Solid structure of the enzyme showing (E)-β-farnesene in the binding cleft. (C) Amino acid residues in proximity to the docked (E)-β-farnesene. (D) Lowest-energy docked pose of (E,E)-α-farnesene in the enzyme binding site.\nFigure 2 Lowest-energy docked poses of (E,E)-farnesol and (E)-nerolidol with the SARS-CoV-2 main protease (PDB: 6Y84). (A) Ribbon structure of the enzyme and (E,E)-farnesol (magenta) and (E)-nerolidol (orange). (B) Solid structure of the enzyme showing (E,E)-farnesol (magenta) and (E)-nerolidol (orange) in the binding cleft. (C) Important interactions of amino acid residues with (E,E)-farnesol. (D) Important interactions of amino acid residues with (E)-nerolidol. Hydrogen bonds are indicated with blue dashed lines.\nFigure 3 Lowest-energy docked poses of (E,E)-α-farnesene, (E)-β-farnesene, (E,E)-farnesol, and (E)-nerolidol with SARS-CoV-2 endoribonuclease (PDB: 6VWW). (A) Ribbon structure of the enzyme and (E,E)-α-farnesene (green), (E)-β-farnesene (aqua), (E,E)-farnesol (magenta), and (E)-nerolidol (orange). (B) Solid structure of the enzyme showing (E,E)-α-farnesene (green), (E)-β-farnesene (aqua), (E,E)-farnesol (magenta), and (E)-nerolidol (orange) in the binding cleft. (C) Lowest-energy docked pose of (E,E)-α-farnesene in the binding site. (D) Lowest-energy docked pose of (E)-β-farnesene in the binding site. (E) Lowest-energy docked pose of (E,E)-farnesol in the binding site. (F) Lowest-energy docked pose of (E)-nerolidol in the binding site. Hydrogen bonds are indicated with blue dashed lines.\nFigure 4 Lowest-energy docked pose of (E,E)-farnesol with SARS-CoV-2 ADP ribose phosphatase (PDB: 6W02). (A) Ribbon structure of the enzyme and the docked ligand. (B) Solid structure of the enzyme showing (E,E)-farnesol in the binding cleft. (C) Amino acid residues in proximity to the docked (E,E)-farnesol (hydrogen bonds are indicated with blue dashed lines).\nFigure 5 Lowest-energy docked poses of β-sesquiphellandrene, α-zingiberene, phytol, and phytone with SARS-CoV-2 ADP ribose phosphatase (PDB: 6W02). (A) Ribbon structure of the enzyme with β-sesquiphellandrene (brown) and α-zingiberene (yellow). (B) Ribbon structure of the enzyme with phytol (green) and phytone (red).\nFigure 6 Lowest-energy docked ligands with the binding domain of SARS-CoV-2 spike protein and human angiotensin-converting enzyme 2 (ACE2) (PDB: 6M17).\nTable 1 Essential oils showing antiviral activity.\nEssential Oil Major Components Assay IC50 (μg/mL) Reference\nAloysia gratissima (Gillies \u0026 Hook.) Tronc. caryophyllene oxide (15.8%), guaiol (17.4%) a, chrysanthenyl acetate (5.6%), and limonene oxide (5.3%) Plaque reduction assay (Vero cells), HSV-1 65.0 [37]\nAloysia triphylla Royle α-thujone (22.9%), cis−carveol (17.5%), carvone (13.2%), and limonene (12.7%) Plaque reduction assay (Vero cells), HSV-1 \u003e250 [38]\nArtemisia arborescens L. camphor (35.7%), β-thujone (24.0%), and chamazulene (7.7%) Plaque reduction assay (Vero cells), HSV-1 25% inhibition at 100 μg/mL [39]\nArtemisia arborescens L. Artemisia arborescens L. β-thujone (45.0%), camphor (6.8%), and chamazulene (22.7%) c Plaque reduction assay (Vero cells), HSV-1, HSV-2 2.4, 4.1 [40]\nArtemisia douglasiana Besser α-thujone (68.3%) and β-thujone (7.5%) Plaque reduction assay (Vero cells), HSV-1 83 [37]\nArtemisia kermanensis Podlech (syn. Seriphidium kermanense (Podlech) K. Bremer \u0026 Humphries α-thujone (13.8%), camphor (10.2%), and β-thujone (6.2%) Plaque reduction assay (Vero cells), HSV-1 40 [41]\nArtemisia mendozana DC. camphor (22.4%), artemiseole (11.7%), artemisia alcohol (10.8%), and borneol (7.2%) Plaque reduction assay, DENV−2, JUNV and HSV-1 129.3, 178.6, and 153.7 [38]\nArtemisia princeps Pamp. borneol (12.1%), α-thujone (8.7%), τ−cadinol, (6.7%), and 1,8-cineole (6.2%) Plaque reduction assay, murine norovirus−1 64% inhibition at 0.01% [42]\nPlaque reduction assay, feline calicivirus−F9 48% inhibition at 0.1%\nArtemisia vulgaris L. α-thujone (38.1%), β-thujone (10.6%), and 1,8-cineole (8.8%) Virus yield assay (Vero cells), yellow fever virus (YFV) 100 μg/mL (100% inhibition) [43]\nAyapana triplinervis (Vahl) R.M. King \u0026 H. Rob. thymohydroquinone dimethyl ether Plaque reduction assay (A549 cells), Zika virus 38.0 [44]\nBuddleja cordobensis Griseb. caryophyllene oxide (32.1%), β-caryophyllene (16.5%), and α-copaene (8.5%) Plaque reduction assay, DENV−2, JUNV and HSV-1 86.4, 39.0, and 54.1 [38]\nCedrus libani A. Rich. himachalol (22.5%), β-himachalene (21.9%), and α-himachalene (10.5%) Cytopathic effect (CPE) on Vero cells, HSV-1 440 [45]\nCinnamomum zeylanicum Blume (syn. Cinnamomum verum J. Presl) eugenol (75–85%), linalool (1.6−8.5%), (E)−cinnamaldehyde (0.6−1.5%), (E)−cinnamyl acetate (0.7–2.6%), β-caryophyllene (0.5–6.7%), eugenyl acetate (0.1–2.9%), and benzyl benzoate (0.1–8.3%) Influenza type A (H1N1) [46]\nCinnamomum zeylanicum Blume (syn. Cinnamomum verum J. Presl) (E)−cinnamaldehyde (63.9%), eugenol (7.0%), and (E)−cinnamyl acetate (5.1%) c Plaque reduction assay (HeLa cells), HSV-2 82 [47]\nCitrus × bergamia Risso \u0026 Poit. limonene (23–55%), linalool (2–37%), linalyl acetate (12–41%), β-pinene (up to 10%), and γ-terpinene (up to 10%) Influenza virus type A H1N1 100% inhibition at 0.3% [46]\nCitrus limonum Risso limonene (54.6%), γ-terpinene (19.1%), and β-pinene (14.5%) d Plaque reduction assay (Vero cells), HSV-1 2500 [48]\nCitrus reshni Hort ex Tan. (leaf EO) sabinene (40.5%), linalool (23.3%), and terpinen-4-ol (8.3%) Plaque reduction assay, influenza A virus H5N1 19.4% inhibition at 0.1 μL/mL [36]\nCitrus reshni Hort ex Tan. (unripe fruit peel EO) limonene (82.4%) and linalool (7.2%) Plaque reduction assay, influenza A virus H5N1 61.5% inhibition at 1.5 μL/mL [36]\nCitrus reshni Hort ex Tan. (ripe fruit peel EO) limonene (91.6%) Plaque reduction assay, influenza A virus H5N1 50% inhibition at 1.5 μL/mL [36]\nCupressus sempervirens L. α-pinene (51.9%) and δ-3-carene (24.9%) c Plaque reduction assay (Vero cells), HSV-1 6600 [48]\nCymbopogon citratus (DC.) Stapf geranial (40.2%), neral (30.6%), and geraniol (6.7%) c Plaque reduction assay (Vero cells), HSV-1 91 [48]\nCymbopogon flexuosus (Nees) Will. Watson geranial (48–54%) and neral (29–33%) Influenza virus type A (H1N1) [46]\nCynanchum stauntonii (Decne.) Schltr. ex H. Lév. (2E,4E)-decadienal (23.0%), γ-nonalactone (4.2%), 5-pentyl-2(3H)−furanone (3.8%), and 3-isopropyl-1-pentanol (3.5%) Influenza type A (H1N1) 64 [46]\nDysphania ambrosioides (L.) Mosyakin \u0026 Clemants cis-ascaridole (60.7%) and m-cymene (22.2%) Plaque reduction assay, Coxsackie virus B4 21.75 [49]\nEucalyptus astringens (Maiden) Maiden 1,8-cineole (42.0%), α-pinene (22.0%), and trans−pinocarveol (7.0%) Vero cells, Coxsakie virus B3 13.0 [50]\nEucalyptus bicostata Maiden, Blakely \u0026 Simmonds 1,8-cineole (68.0%), globulol (5.4%), and trans−pinocarveol (4.6%) Vero cells, Coxsakie virus B3 13.6 [50]\nEucalyptus caesia Benth. 1,8-cineole (40.2%), p-cymene (14.1%), γ-terpinene (12.4%), α-pinene (7.7%), and terpinen-4-ol (5.6%) Plaque reduction assay (Vero cells), HSV-1 70 [41]\nEucalyptus camaldulensis Dehnh. α-terpinene (26.3%), α-terpineol (9.1%), and camphene (8.5%) e Plaque reduction assay, Rotavirus Wa strain 50% inhibition at 10% EO concentration [51]\nEucalyptus camaldulensis Dehnh. α-terpinene (26.3%), α-terpineol (9.1%), and camphene (8.5%) e Plaque reduction assay, Coxsackie virus B4 53.3% at 10% EO concentration [51]\nEucalyptus camaldulensis Dehnh. α-terpinene (26.3%), α-terpineol (9.1%), and camphene (8.5%) e Plaque reduction assay, HSV-1 90% at 10% EO concentration [51]\nEucalyptus camaldulensis Dehnh. α-terpinene (26.3%), α-terpineol (9.1%), and camphene (8.5%) e Plaque reduction assay, adenovirus type 7 0% at 10% EO concentration [51]\nEucalyptus cinereal F. Muell. ex Benth. 1,8-cineole (70.4%), α-pinene (4.5%), and limonene (3.7%) Vero cells, Coxsakie virus B3 13.0 [50]\nEucalyptus globulus Labill. 1,8-cineole (63.8%) and α-pinene (14.0%) f Plaque reduction assay (Vero cells), HSV-1 1700 [48]\nEucalyptus globulus Labill. 1,8-cineole (63.8%) and α-pinene (14.0%) f Plaque reduction assay (RC-37 cells), HSV-1 55.0 [52]\nEucalyptus lehmannii (Schauer) Benth. 1,8-cineole (59.6%), α-pinene (17.6%), and α-terpineol (8.7%) Vero cells, Coxsakie virus B3 11.5 [50]\nEucalyptus leucoxylon F. Muell. 1,8-cineole (59.2%), α-pinene (7.8%), and α-terpineol (4.3%) Vero cells, Coxsakie virus B3 8.1 [50]\nEucalyptus maidenii F. Muell. 1,8-cineole (57.8%), p-cymene (7.4%), and α-pinene (7.3%) Vero cells, Coxsakie virus B3 14.5 [50]\nEucalyptus odorata Behr cryptone (20.9%), p-cymene (16.7%), phellandral (6.6%), and cuminal (6.6%) Vero cells, Coxsakie virus B3 19.2 [50]\nEucalyptus sideroxylon A. Cunn. ex Woolls 1,8-cineole (69.2%), α-pinene (6.9%), and α-terpineol (5.4%) Vero cells, Coxsakie virus B3 12.3 [50]\nEupatorium patens D. Don ex Hook. \u0026 Arn. germacrene D (36.2%), β-caryophyllene (14.1%), and bicyclogermacrene (7.0%) Plaque reduction assay (Vero cells), HSV-1 125 [37]\nFortunella margarita (Lour.) Swingle (leaf EO) α-terpineol (55.5%), carvone (5.7%), carveol (5.5%), γ-muurolene (5.5%), and citronellal (5.0%) MTT assay, reasserted avian influenza A virus, H5N1 6.77 [53]\nFortunella margarita (Lour.) Swingle (fruit EO) β-eudesmol (28.3%), α-muurolene (10.3%), β-gurjunene (10.0%), γ-eudesmol (8.4%), and γ-muurolene (6.6%) MTT assay, reasserted avian influenza A virus, H5N1 38.89 [53]\nGaillardia megapotamica (Spreng.) Baker β-pinene (24.2%), (Z)-β-ocimene (16.5%), α-pinene (7.7%), limonene (7.5%), and β-caryophyllene (6.7%) Plaque reduction assay, DENV−2, JUNV and HSV-1 140.6, 49.8, and 99.1 [38]\nHeterothalamus alienus (Spreng.) Kuntze β-pinene (35.5%), spathulenol (10.7%), and germacrene D (6.8%) Plaque reduction assay DENV−2, JUNV and HSV-1 122.3, 44.2 and 148.4 [38]\nHeterotheca latifolia Buckley borneol (40.0%), camphor (24.3%), and limonene (5.1%) Plaque reduction assay (Vero cells), HSV-1 \u003e150 [37]\nHouttuynia cordata Thunb. decanal (3.4−8.9%), decanol (up to 7.0%), 2−undecanone (23.0−36.1%), decanoic acid (1.4−6.3%), dodecanal (up to 7.3%), and 2−tridecanone (2.6−5.6%) Influenza type A (H1N1) 48 [54]\nHyptis mutabilis (Rich.) Briq. fenchone (17.1%), 1,8-cineole (12.6%), β-caryophyllene (10.9%), bicyclogermacrene (8.7%), and germacrene D (6.2%) Plaque reduction assay (Vero cells), HSV-2 (Human Herpesvirus type 1) 79.01 [55]\nHyptis mutabilis (Rich.) Briq. germacrene D (15.1%), β-caryophyllene (13.3%), curzerene (13.3%), and bicyclogermacrene (13.2%) Plaque reduction assay (Vero cells) \u003e150 [37]\nHyssopus officinalis L. cis−pinocamphone (40.1%), trans−pinocamphone (13.3%), β-pinene (10.7%), and β-phellandrene (5.3%) c Plaque reduction assay (RC-37 cells), HSV-1 1 [56]\nHyssopus officinalis L. cis−pinocamphone (40.1%), trans−pinocamphone (13.3%), β-pinene (10.7%), and β-phellandrene (5.3%) c Plaque reduction assay (RC-37 cells), HSV-2 6 [57]\nIllicium verum Hook. f. (E)−anethole (90.5%) c Plaque reduction assay (RC-37 cells), HSV-1 40 [58]\nIllicium verum Hook. f. (E)−anethole (90.5%) c Plaque reduction assay (RC-37 cells), HSV-1 1 [59]\nIllicium verum Hook. f. (E)−anethole (90.5%) c Plaque reduction assay (RC-37 cells), HSV-2 30 [57]\nJungia polita Griseb. caryophyllene oxide (9.2%) and β-caryophyllene (8.1%) Plaque reduction assay DENV−2, JUNV and HSV-1 39.8, 134.2 and 136.4 [38]\nJuniperus communis L. α-pinene (46.7%), myrcene (15.0%), sabinene (13.2%), and limonene (7.0%) c Plaque reduction assay (Vero cells), HSV-1 \u003e10000 [48]\nLavandula angustifolia Mill. linalyl acetate (37.0−43.6%), linalool (19.7−39.1%), geraniol (up to 9.3%), β-caryophyllene (up to 5.1%), terpinene−4−ol (up to 14.9%), lavandulol (up to 1.5%), lavandulyl acetate (up to 5.5%), 1,8-cineole (up to 4.1%), and borneol (up to 6.4%) 85% in vitro inhibition of influenza type A (H1N1) [46]\nLavandula latifolia Medik. linalool (31.9%), 1,8-cineole (18.8%), and borneol (10.1%) g Plaque reduction assay (Vero cells), HSV-1 2200 [48]\nLepechinia salviifolia (Kunth) Epling camphor (10.3%), limonene (9.7%), p−mentha−1(7),8−diene (7.4%), α-pinene (6.9%), and γ-terpinene (6.7%) Plaque reduction assay (Vero cells), HSV-1, HSV-2 68.8, 81.9 [55]\nLepechinia vulcanicola J.R.I. Wood limonene (18.9%), germacrene D (10.4%), 1−octen−3−ol (8.8%), β-caryophyllene (8.7%), and α-pinene (8.2%) Plaque reduction assay (Vero cells), HSV-1, HSV-2 112, 68.9 [55]\nLeptospermum scoparium J.R. Forst. \u0026 G. Forst. calamene (16.0%), leptospermone (14.5%), δ−cadinene (6.1%), flavesone (4.5%), viridiflorene (4.4%), and isoleptospermone (3.9%) Plaque reduction assay (RC-37 cells), HSV-1, HSV-2 0.96, 0.58 [60]\nLippia alba (Mill.) N.E. Br. ex Britton \u0026 P. Wilson carvone (51.0%), Limonene (33%), and bicyclosesquiphellandrene (7.0%) Virus yield assay (Vero cells), yellow fever virus (YFV) 100 μg/mL (100% inhibition) [43]\nLippia alba (Mill.) N.E. Br. ex Britton \u0026 P. Wilson carvone (39.7%), limonene (30.6%), and bicyclosesquiphellandrene (8.9%) Plaque reduction assay (Vero cells), DENV−1, DENV−2, DENV−3, DENV−4, YFV 17 DD 10.1, 0.4, 32.6, 21.1, 4.9 [61]\nLippia alba (Mill.) N.E. Br. ex Britton \u0026 P. Wilson carvone (39.7%), limonene (30.6%), and bicyclosesquiphellandrene (8.9%) Plaque reduction assay (Vero cells), Yellow fever (YFV) 4.3 [62]\nLippia citriodora Kunth (syn. Aloysia citriodora Palau) geranial (18.9%), neral (15.6%), limonene (10.7%), and 1,8-cineole (5.0) Plaque reduction assay (Vero cells), DENV−1, DENV−2, DENV−3, DENV−4, YFV 17 DD 1.9, 2.9, 2.6, 33.7, 5.7 [61]\nLippia citriodora Kunth (syn. Aloysia citriodora Palau) geranial (18.9%), neral (15.6%), limonene (10.7%), and 1,8-cineole (5.0) Plaque reduction assay (Vero cells), Yellow fever (YFV) 19.4 [62]\nLippia graveolens Kunth carvacrol (56.8%), o−cymene (32.1%), and γ-terpinene (3.7%) h MTT assay (Mardin−Darby bovine kidney cells), HSV-1, ACVR−HSV-1 (acyclovir−resistant HSV-1), HRSV (human respiratory syncytial virus) 99.6, 55.9, 68.0 [63]\nLippia junelliana (Moldenke) Tronc. piperitenone oxide (= rotundifolone) (36.5%), limonene (23.1%), camphor (7.9%), and spathulenol (6.5%) Plaque reduction assay (Vero cells), HSV-1 \u003e150 [37]\nLippia origanoides carvacrol (44.0%), thymol (15.0%), and γ-terpinene (10.0%) Virus yield assay (Vero cells), yellow fever virus (YFV) 11.1 μg/mL (100% inhibition) [43]\nLippia turbinata Griseb. limonene (60.6%), piperitenone oxide (17.4%), and β-caryophyllene (6.4%) Plaque reduction assay (Vero cells), HSV-1 \u003e 150 [37]\nMatricaria recutita L. α-bisabolol oxide A (13.4–55.9%), α-bisabolol oxide B (8.4–25.1%), bisabolone oxide A (2.9–11.4%), cis−bicycloether (= (Z)−spiroether) (3.6–17.7%), and (E)-β-farnesene (1.9–10.4%) i Plaque reduction assay (RC-37 cells), HSV-1 0.3 [58]\nMatricaria recutita L. α-bisabolol oxide A (13.4–55.9%), α-bisabolol oxide B (8.4–25.1%), bisabolone oxide A (2.9−11.4%), cis−bicycloether (= (Z)−spiroether) (3.6–17.7%), and (E)-β-farnesene (1.9–10.4%) i Plaque reduction assay (RC-37 cells), HSV-2 1.5 [57]\nMelaleuca alternifolia Cheel terpinen-4-ol (36.71%), γ-terpinene (22.20%), and α-terpinene (10.10%) Plaque reduction assay, influenza A⁄PR ⁄ 8 virus subtype H1N1 60 [31]\nMelaleuca alternifolia Cheel terpinen-4-ol (30–48%), γ-terpinene (10–28%), α-terpinene (5–13%), 1,8-cineole (up to 15%), terpinolene (1.5−5%), p-cymene (0.5–12%), α-pinene (1–6%), and α-terpineol (1.5–8%) 100% inhibition of influenza type A (H1N1) virus at 0.01%; type A (H11N9) virus to tea tree oil vapor caused 100% inhibition [46]\nMelaleuca alternifolia Cheel terpinen-4-ol (47.5%), γ-terpinene (20.2%), and α-terpinene (8.6%) c Plaque reduction assay (Vero cells), HSV-1 2700 [48]\nMelaleuca alternifolia Cheel terpinen-4-ol (47.5%), γ-terpinene (20.2%), and α-terpinene (8.6%) c Plaque reduction assay (Vero cells), HSV-1 13.2 [64]\nMelaleuca alternifolia Cheel terpinen-4-ol (47.5%), γ-terpinene (20.2%), and α-terpinene (8.6%) c Plaque reduction assay (RC-37 cells), HSV-1 2 [52]\nMelaleuca alternifolia Cheel terpinen-4-ol (47.5%), γ-terpinene (20.2%), and α-terpinene (8.6%) c Plaque reduction assay (HeLa cells), HSV-2 2700 [47]\nMelaleuca alternifolia Cheel terpinen-4-ol (47.5%), γ-terpinene (20.2%), and α-terpinene (8.6%) c Plaque reduction assay (Vero cells), HSV-1 significant plaque reduction at 10 and 5% v/v [65]\nMelaleuca armillaris (Sol. ex Gaertn.) Sm. 1,8-cineole (33.9%), terpinen-4-ol (18.8%), and γ-terpinene (10.4%) Plaque reduction assay (Vero cells), HSV-1 99% plaque reduction (concentration not given) [66]\nMelaleuca ericifolia Sm. methyl eugenol (96.84%) Plaque reduction assay (Vero cells), HSV-1 91.5% plaque reduction (concentration not given) [66]\nMelaleuca leucadendra (L.) L. 1,8-cineole (64.3%), α-terpineol (11.0%), and valencene (3.91%) Plaque reduction assay (Vero cells), HSV-1 92% plaque reduction (concentration not given) [66]\nMelissa officinalis L. neral (17−32%), geranial (23–43%), linalool (up to 9.0%), citronellal (0.7–20.3%), geraniol (up to 23.2%), β-caryophyllene (up to 11.3%), and caryophyllene oxide (0.4−31.7%) influenza A virus (H9N2) Significant reduction at 5 μg/mL [46]\nMelissa officinalis L. β-cubebene (15.4%), β-caryophyllene (14.2%), α-cadinol (7.2%), geranial (6.6%), and neral (5.8%) Plaque reduction assay (HEp−2 cells), HSV-2 21 [67]\nMelissa officinalis L. geranial (20.1%), β-caryophyllene (17.3%), and neral (13.6%) Plaque reduction assay (RC-37 cells), HSV-1, HSV-2 4, 0.8 [68]\nMentha × piperita L. menthol (42.8%), menthone (14.6%), and isomenthone (5.9%) Plaque reduction assay (RC-37 cells), HSV-1, HSV-2 20, 8 [69]\nMentha × piperita L. menthol (43.8%), menthone (19.7%), menthyl acetate (6.5%), and 1,8-cineole (5.0%) c Plaque reduction assay (Vero cells), HSV-1 2200 [48]\nMentha suaveolens Ehrh. limonene (7.4%), isopulegol (12.0%), and piperitenone oxide (41.8%) Plaque reduction assay, cytopathogenic murine norovirus 0.87 [70]\nMentha suaveolens Ehrh. piperitenone oxide (86.9%) Plaque reduction assay (Vero cells), HSV-1 5.1 [64]\nMinthostachys mollis Griseb. cis−piperitone epoxide (29.9%), piperitenone oxide (25.6%), menthone (7.4%), germacrene D (5.8%), and pulegone (5.5%) Plaque reduction assay (Vero cells), HSV-1, HSV-2 70.7, 68.0 [55]\nOcimum basilicum var. album (L.) Benth. linalool (53.8%) and eugenol (12.6%) j Plaque reduction assay (Vero cells), HSV-1 \u003e10000 [48]\nOcimum campechianum Mill. methyl eugenol (53.9%), β-caryophyllene (13.0%), α-bulnesene (5.4%), germacrene D (3.4%), and α-humulene (3.3%) Plaque reduction assay (Vero cells), HSV-2 74.33 [55]\nOriganum elongatum Emb. (leaf EO) p-cymene (16.2%), γ-terpinene (13.5%), thymol (14.2%), and carvacrol (19.2%) Plaque reduction assay, cytopathogenic murine norovirus 0.37 [70]\nOriganum elongatum Emb. (inflorescence EO) p-cymene (16.1%), γ-terpinene (7.3%), and carvacrol (40.1%), Plaque reduction assay, cytopathogenic murine norovirus 0.75 [70]\nOriganum majorana L. terpinen-4-ol (28.9%), γ-terpinene (14.9%), trans−sabinene hydrate (9.5%), α-terpinene (8.7%), and sabinene (7.2%) c Plaque reduction assay (Vero cells), HSV-1 2800 [48]\nOriganum majorana L. terpinen-4-ol (28.9%), γ-terpinene (14.9%), trans−sabinene hydrate (9.5%), α-terpinene (8.7%), and sabinene (7.2%) c Plaque reduction assay (HeLa cells), HSV-2 520 [47]\nOriganum vulgare L. trans−sabinene hydrate (21.0%), thymol (11.0%), and carvacrol methyl ether (11.0%) Virus yield assay (Vero cells), yellow fever virus (YFV) 100 μg/mL (100% inhibition) [43]\nOsmunda regalis L. hexahydrofarnesyl acetone ( = phytone) (11.8%), 2,4−di−t−butylphenol (6.8%), phytol (6.5%), hexadecene (4.1%), and octadecene (4.4%) Plaque reduction assay, Coxsackie virus B4 type 2 2.24 [71]\nPectis odorata Griseb. limonene (50.2%), neral (27.2%), and geranial (23.6%) Plaque reduction assay DENV−2, JUNV and HSV-1 39.6, 36.6, and 71.5 [38]\nPelargonium graveolens L’Hér. ex Aiton citronellol (21.9–37.5%), citronellyl formate (9.8–20.6%), geraniol (6.0–16.5%), geranyl formate (1.5–6.5%), menthone (up to 13%), isomenthone (up to 9.9%), and linalool (0.8−14.9%) influenza type A (H1N1) 95% inhibition at 0.3% [46]\nPinus mugo Turra δ-3-carene (23.9%), α-pinene (17.9%), β-pinene (7.8%), and β-phellandrene (7.2%) k Plaque reduction assay (RC-37 cells), HSV-1 7 [58]\nRavensara aromatica Sonn. (syn. Cryptocarya agathophylla van der Werff) 1,8-cineole (52.6%), α-terpineol (12.4%), and sabinene (11.0%) l Plaque reduction assay (Vero cells), HSV-1 2800 [48]\nRosmarinus officinalis L. α-pinene (23.9%), verbenone (15.4%), camphor (11.0%), camphene (8.7%), p-cymene (7.5%), and 3−octanone (5.6%) Plaque reduction assay (Vero cells), HSV-1 60 [41]\nRosmarinus officinalis L. 1,8-cineole (45.9%), α-pinene (12.0%), camphor (10.9%), and β-pinene (6.3%) b Plaque reduction assay (Vero cells), HSV-1 2700 [48]\nSalvia fruticosa Mill. 1,8-cineole (47.5%), camphor (9.0%), β-thujone (7.6%), and α-thujone (4.3%) Plaque reduction assay (Vero cells), HSV-1 and HSV-2 1300 [72]\nSantalum album L. (Z)−α-santalol (45.2%), (Z)-β-santalol (25.4%), and (Z)−trans−α-bergamotol (7.8%) c Plaque reduction assay (Vero cells), HSV-1, HSV-2 22.7, 45.3 [73]\nSantalum album L. (Z)−α-santalol (45.2%), (Z)-β-santalol (25.4%), and (Z)−trans−α-bergamotol (7.8%) c Plaque reduction assay (RC-37 cells), HSV-1 2 [56]\nSantalum album L. (Z)−α-santalol (45.2%), (Z)-β-santalol (25.4%), and (Z)−trans−α-bergamotol (7.8%) c Plaque reduction assay (RC-37 cells), HSV-2 5 [57]\nSantolina insularis (Gennari ex Fiori) Arrigoni artemisia ketone (21.2%), allo−aromadendrene (12.7%), 1,8-cineole (9.0%), and camphene (8.5%) m Plaque reduction assay (Vero cells), HSV-1 and HSV-2 0.88, 0.7 [74]\nSatureja hortensis L. carvacrol (32.4%), γ-terpinene (32.0%), thymol (10.0%), and p-cymene (6.6%) Plaque reduction assay (Vero cells), HSV-1 80 [41]\nTessaria absinthioides (Hook. \u0026 Arn.) DC. caryophyllene oxide (12.2%), (E)-β-damascenone, γ-eudesmol (8.5%), α-gurjunene (5.8%), and terpinen-4-ol (5.4%) Plaque reduction assay (Vero cells), HSV-1 105 [37]\nThymus capitatus (L.) Hoffmanns. \u0026 Link (unripe fruit EO) carvacrol (68.6%), p-cymene (4.8%), γ-terpinene (3.0%), and β-caryophyllene (2.9%) Plaque reduction assay, cytopathogenic murine norovirus 0.49 [70]\nThymus capitatus (L.) Hoffmanns. \u0026 Link (ripe fruit EO) carvacrol (58.8%), p-cymene (5.6%), γ-terpinene (2.8%), and β-caryophyllene (2.6%) Plaque reduction assay, cytopathogenic murine norovirus 0.50 [70]\nThymus vulgaris L. thymol (31–50%), p-cymene (0.1–26.6%), and γ-terpinene (up to 22.8%) 100% inhibition of type A (H1N1) virus at 0.3% concentration [46]\nThymus vulgaris L. thymol (43.9%), carvacrol (14.4%), p-cymene (10.5%), β-caryophyllene (7.0%), and γ-terpinene (5.1%) c Plaque reduction assay (RC-37 cells), HSV-1 10 [56]\nThymus vulgaris L. thymol (43.9%), carvacrol (14.4%), p-cymene (10.5%), β-caryophyllene (7.0%), and γ-terpinene (5.1%) c Plaque reduction assay (RC-37 cells), HSV-1 11 [52]\nThymus vulgaris L. thymol (43.9%), carvacrol (14.4%), p-cymene (10.5%), β-caryophyllene (7.0%), and γ-terpinene (5.1%) c Plaque reduction assay (RC-37 cells), HSV-2 7 [57]\nThymus willdenowii Boiss. 1,8-cineole (34.62%), camphor (18.55%), α-pinene (9.46%), and camphene (5.38%) Plaque reduction assay, Coxsackie virus Inactive [75]\nTrachyspermum ammi (L.) Sprague thymol (35–60%), α-pinene, p-cymene, and limonene Plaque reduction assay, Japanese encephalitis virus 80% reduction at 500 μg/mL [76]\nZataria multiflora Boiss. thymol (47.3%), carvacrol (21.9%), p-cymene (8.6%), γ-terpinene (4.2%), and β-caryophyllene (3.0%) Real time PCR (H9N2 subtype of AIV) Reduced viral replication in trachea of broiler chickens [77]\nZataria multiflora Boiss. thymol (33.1%), carvacrol (25.9%), and p-cymene (11.3%) Plaque reduction assay (Vero cells), HSV-1 30 [41]\nZingiber officinale Roscoe α-zingiberene (32.1%), ar−curcumene (15.2%), β-sesquiphellandrene (10.9%), α-farnesene (7.2%), and α-phellandrene (4.4%) Plaque reduction assay, Caprine alphaherpesvirus type I not determined [78]\nZingiber officinale Roscoe α-zingiberene (26.4%), camphene (12.6%), β-sesquiphellandrene (9.2%), ar−curcumene (6.5%), β-phellandrene (6.2%), and β-bisabolene (5.1%) c Plaque reduction assay (RC-37 cells), HSV-1 2 [56]\nZingiber officinale Roscoe α-zingiberene (26.4%), camphene (12.6%), β-sesquiphellandrene (9.2%), ar−curcumene (6.5%), β-phellandrene (6.2%), and β-bisabolene (5.1%) c Plaque reduction assay (RC-37 cells), HSV-2 1 [57]\na Reported as cadinol, but see [79,80]. b Essential oil composition not reported; essential oil composition obtained from [81]. c Essential oil composition not reported; essential oil composition of commercial (dōTERRA International, Pleasant Grove, Utah, USA). d Essential oil composition not reported; essential oil composition obtained from [82]. e Essential oil composition not reported; essential oil composition obtained from [83]. f Essential oil composition not reported; essential oil composition obtained from [84]. g Essential oil composition not reported; essential oil composition obtained from [85]. h Essential oil composition not reported; essential oil composition obtained from [86]. i Essential oil composition not reported; essential oil composition obtained from [87]. j Essential oil composition not reported; essential oil composition obtained from [88]. k Essential oil composition not reported; essential oil composition obtained from [89]. l Essential oil composition not reported; essential oil composition obtained from [90]. m Essential oil composition not reported; essential oil composition obtained from [91].\nTable 2 Antiviral activities of essential oil components.\nEssential Oil Component Assay IC50 (μg/mL) Reference\n(E)−Anethole Plaque reduction assay (RC-37 cells), HSV-1 20 [59]\nCamphor Plaque reduction assay (Vero cells), HSV-1 2600 [72]\nCarvacrol MTT assay (Mardin−Darby bovine kidney (MDBK) cells, HSV-1 48.6 [63]\nβ-Caryophyllene Plaque reduction assay (RC-37 cells), HSV-1 0.25 [59]\nCaryophyllene oxide Plaque reduction assay (RC-37 cells), HSV-1 0.7 [59]\n1,8-Cineole Plaque reduction assay (Vero cells), HSV-1 1800 [72]\n1,8-Cineole Plaque reduction assay (RC-37 cells), HSV-1 1200 [52]\n(E)-Cinnamaldehyde Influenza type A (H1N1) virus 70% at a concentration of 0.53% after 3 h [95]\n(E)-Cinnamaldehyde H1N1 in-vivo by inhalation in a mouse model 89% inhibition [95]\nCitral (Geranial + Neral) Yellow fever (YFV), Vero cells 17.6 [62]\nCitral (Geranial + Neral) Plaque reduction assay (RC-37 cells), HSV-1 3.50 [52]\np-Cymene Influenza, HSV-1, HSV-2, ECHO 9, Cox B1, Polio 1, Adeno 6 \u003e500 [31]\np-Cymene Plaque reduction assay (RC-37 cells), HSV-1 16 [52]\np-Cymene Influenza type A (H1N1) virus Inactive [25]\nDodecanal Influenza type A (H1N1) virus 51 [54]\nβ-Eudesmol Plaque reduction assay (Vero cells), HSV-1 6 [59]\nEugenol Plaque reduction assay (RC-37 cells), HSV-1 35 [59]\nEugenol Plaque reduction assay (RC-37 cells), HSV-1 25.6 [96]\nFarnesol Plaque reduction assay (RC-37 cells), HSV-1 3.5 [59]\nGermacrone Influenza type A (H1N1) virus 1.22–1.55 [97]\nGermacrone Influenza type A (H3N2) virus 0.34 [97]\nGermacrone Influenza type B virus 1.38 [97]\nIsoborneol Plaque reduction assay (Vero cells), HSV-1 \u003c1000 [98]\nNerolidol (natural) Plaque reduction assay (RC-37 cells), HSV-1 4.2 [99]\nNerolidol (synthetic) Plaque reduction assay (RC-37 cells), HSV-1 1.5 [99]\nOctanal Influenza type A (H1N1) virus 15 [54]\nPatchouli alcohol Influenza type A (H1N1) 89% inhibition at 10 μg/mL [100]\nPatchouli alcohol Influenza type A (H2N2) 0.89 [101]\nPatchouli alcohol Influenza type A (H2N2), in-vivo test using a mouse model 70% survival rate at a dose of 5 mg/(kg day) [101]\nα-Pinene Plaque reduction assay (RC-37 cells), HSV-1 4.5 [52]\nPiperitenone oxide Plaque reduction assay (Vero cells) 1.4 [64]\nα-Terpinene Influenza type A (H1N1) virus Inactive [25]\nα-Terpinene Influenza, HSV-1, HSV-2, ECHO 9, Cox B1, Polio 1, Adeno 4 \u003e12 [31]\nα-Terpinene Plaque reduction assay (RC-37 cells), HSV-1 8.5 [52]\nγ-Terpinene Plaque reduction assay (RC-37 cells), HSV-1 7 [52]\nγ-Terpinene Influenza, HSV-1, HSV-2, ECHO 9, Cox B1, Polio 1, Adeno 5 \u003e120 [31]\nγ-Terpinene influenza type A (H1N1) virus inactive [25]\nTerpinen-4-ol Influenza, HSV-1, HSV-2, ECHO 9, Cox B1, Polio 1, Adeno 2 25 (influenza)\u003e50 (others) [31]\nTerpinen-4-ol Plaque reduction assay (Vero cells), HSV-1 60 [52]\nα-Terpineol Plaque reduction assay (RC-37 cells), HSV-1 22 [52]\nTerpinolene Influenza, HSV-1, HSV-2, ECHO 9, Cox B1, Polio 1, Adeno 3 12 (influenza)\u003e12 (others) [31]\nThujones (α \u0026 β) Plaque reduction assay (RC-37 cells), HSV-1 400 [72]\nThymol Influenza type A (H1N1) virus Active [25]\nThymol Plaque reduction assay (RC-37 cells), HSV-1 30 [52]\n2-Undecanone influenza type A (H1N1) virus 62 [54]\nTable 3 Docking scores, normalized for molecular weight (DSnorm, kJ/mol), of essential oil components with severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) molecular targets.\nCompound MainProtease Endoribo-Nuclease ADP RibosePhosphatase RNA-DependentRNA Polymerase Spike ProteinBinding Domain Angiotensin-Converting Enzyme a\n(E)-Anethole −84.9 −83.0 −97.5 −74.0 −65.2 −83.8\nallo-Aromadendrene −86.6 −86.9 −95.8 −74.9 −66.1 −85.3\nArtemiseole −89.2 −83.4 −96.6 −73.0 −67.8 −78.0\n(R)-Artemisia alcohol −84.3 −78.3 −88.2 −66.8 −61.1 −74.7\n(S)-Artemisia alcohol −86.1 −85.4 −98.5 −69.5 −67.1 −77.4\nArtemisia ketone −91.0 −85.7 −97.9 −71.9 −66.9 −77.3\nAscaridole −74.8 −68.2 −86.0 −65.2 −62.6 −64.4\nBenzyl benzoate −104.9 −96.5 −110.3 −82.5 −74.9 −96.4\n(Z)-trans-α-Bergamotol −98.0 −91.2 −105.9 −71.9 −63.6 −83.6\nBicyclogermacrene −85.9 −88.0 −92.5 −75.6 −68.2 −86.1\nBicyclosesquiphellandrene −79.4 −89.6 −86.0 −61.8 −62.5 −78.2\nα-Bisabolol oxide A −88.5 −87.6 −89.1 −71.5 −63.5 −89.7\nα-Bisabolol oxide B −96.6 −92.2 −101.0 −79.7 −75.2 −95.6\nBisabolone oxide A −93.7 −87.9 −98.2 −73.3 −71.0 −78.7\n(+)-Borneol −77.4 −91.8 −100.1 −74.1 −70.9 −73.3\n(−)-Borneol −71.4 −71.5 −78.4 −56.7 −50.1 −73.7\n(+)-iso-Borneol −75.6 −75.3 −75.9 −60.8 −53.2 −71.8\n(−)-iso-Borneol −73.8 −69.2 −75.6 −54.8 −49.3 −72.4\nα-Bulnesene −95.2 −72.4 −78.4 −57.0 −57.8 −101.7\nδ-Cadinene −91.6 −90.2 −112.6 −75.2 −60.0 −93.4\nτ-Cadinol −92.3 −82.8 −82.5 −69.9 −69.8 −87.8\n(R)-Calamene −92.3 −83.5 −97.4 −69.0 −65.6 −87.3\n(S)-Calamene −88.4 −86.8 −95.9 −70.2 −64.7 −87.5\n(+)-Camphene −85.6 −78.9 −83.2 −64.4 −57.9 −72.2\n(−)-Camphene −77.2 −74.1 −87.1 −66.0 −59.8 −67.1\n(+)-Camphor −75.2 −73.1 −77.9 −63.9 −53.8 −69.4\n(−)-Camphor −72.5 −70.0 −75.6 −64.3 −52.8 −70.8\n(+)-δ-3-Carene −87.9 −78.6 −87.0 −65.0 −72.4 −75.8\n(−)-δ-3-Carene −83.9 −88.0 −90.4 −66.8 −67.3 −73.4\nCarvacrol −84.5 −86.6 −94.8 −74.1 −71.0 −81.2\nCarvacrol methyl ether −85.5 −82.5 −103.1 −74.6 −65.8 −83.7\n(+)-cis−Carveol −87.0 −81.8 −97.7 −76.5 −69.7 −80.4\n(−)-cis−Carveol −85.6 −85.0 −95.6 −76.8 −74.3 −81.2\n(R)-Carvone −87.7 −82.4 −98.2 −74.7 −69.2 −83.4\n(S)-Carvone −86.2 −83.2 −98.9 −73.2 −66.3 −82.2\n(E)-Caryophyllene −81.2 −82.2 −93.9 −73.4 −59.2 −75.1\nCaryophyllene oxide −80.6 −86.7 −97.0 −74.1 −66.5 −83.3\nCedrol −82.3 −84.4 −80.1 −69.7 −58.3 −69.9\nepi-Cedrol −76.4 −88.4 −92.2 −68.5 −55.5 −75.9\nChamazulene −97.6 −96.4 −110.9 −76.9 −73.7 −95.6\n(−)-cis-Chrystanthyl acetate −83.2 −77.5 −87.1 −71.5 −60.2 −80.9\n(−)-trans−Chrysanthenyl acetate −77.0 −81.4 −85.3 −65.9 −68.9 −72.4\n1,8-Cineole −72.7 −67.6 −71.5 −58.1 −58.6 −61.0\n(E)-Cinnamaldehyde −93.1 −85.8 −100.0 −76.4 −73.1 −81.0\n(E)-Cinnamyl acetate −99.4 −88.0 −108.9 −76.9 −80.6 −89.5\n(R)-Citronellal −99.9 −91.6 −105.0 −75.1 −73.3 −88.0\n(S)-Citronellal −98.3 −88.9 −107.4 −72.1 −71.4 −86.2\n(R)-Citronellol −99.9 −90.2 −104.9 −75.7 −72.3 −84.9\n(S)-Citronellol −99.2 −92.2 −107.6 −74.2 −77.4 −85.1\n(R)-Citronellyl formate −105.5 −92.6 −109.9 −72.8 −76.2 −90.5\n(S)-Citronellyl formate −101.5 −96.4 −114.7 −81.9 −78.3 −91.0\nα-Copaene −84.1 −78.9 −85.9 −60.2 −59.6 −77.1\nCostunolide −94.5 −99.2 −110.2 −78.2 −74.9 −92.6\n(R)-Cryptone −86.6 −82.4 −93.5 −68.2 −70.4 −74.8\n(S)-Cryptone −81.5 −82.9 −94.9 −69.8 −70.6 −76.6\nβ-Cubebene −90.8 −92.0 −86.7 −76.0 −71.2 −89.8\nCuminaldehyde −86.2 −80.5 −103.3 −74.9 −67.5 −81.7\nar-Curcumene −105.3 −94.0 −108.6 −82.8 −75.8 −96.4\nCurcumol −83.0 −93.4 −91.2 −73.5 −69.6 −86.0\nCurdione −86.2 −98.1 −99.0 −77.3 −71.7 −92.0\nCurzerene −91.5 −86.0 −104.2 −76.8 −67.6 −90.5\nm-Cymene −83.6 −81.3 −92.8 −72.0 −67.6 −79.0\no-Cymene −83.2 −78.3 −87.7 −63.9 −63.3 −72.9\np-Cymene −79.7 −78.7 −91.0 −70.3 −63.9 −75.4\n(E)-β-Damascenone −85.2 −87.6 −110.2 −73.8 −73.8 −84.8\n(2E,4E)-Decadienal −105.7 −97.7 −112.5 −81.8 −78.7 −90.0\nDodecanal −102.8 −93.9 −101.9 −77.9 −73.3 −94.9\nEremanthin −97.7 −97.7 −98.0 −83.7 −81.3 −100.9\nβ-Eudesmol −97.6 −87.4 −106.5 −75.8 −64.5 −74.7\nγ-Eudesmol −93.6 −89.9 −94.7 −69.4 −66.1 −84.3\nEugenol −93.2 −91.7 −105.2 −80.0 −79.1 −88.4\nEugenol methyl ether −88.5 −85.3 −111.1 −71.7 −68.6 −89.3\nEugenyl acetate −96.3 −89.3 −115.1 −75.6 −70.6 −94.9\n(E,E)-α-Farnesene −115.0 −107.5 −112.8 −86.8 −85.3 −100.3\n(E)-β-Farnesene −115.4 −105.0 −116.3 −87.1 −82.9 −100.7\n(E,E)-Farnesol −112.4 −104.6 −121.4 −89.6 −80.8 −100.9\n(+)-Fenchone −80.0 −80.9 −87.1 −66.1 −60.8 −66.9\n(-)-Fenchone −83.3 −67.5 −86.2 −66.5 −60.9 −68.8\nFlavesone −82.3 −84.0 −95.7 −68.9 −64.4 −78.9\nGeranial −101.7 −90.8 −113.0 −76.1 −74.5 −92.0\nGeraniol −103.5 −98.5 −110.2 −77.4 −76.4 −93.8\nGeranyl formate −105.9 −93.9 −111.4 −80.8 −80.3 −96.2\nGermacrene D −92.1 −96.7 −110.5 −77.1 −73.0 −87.3\nGermacrone −85.1 −97.1 −94.9 −71.6 −67.1 −80.9\nGuiaol −94.1 −92.5 −113.4 −79.2 −79.4 −91.9\nα-Gurjunene −89.9 −83.2 −81.3 −71.5 −61.3 −79.8\nβ-Gurjunene −77.4 −64.1 −81.1 −64.1 −58.0 −75.1\nα-Himachalene −80.4 −89.7 −86.5 −63.7 −67.9 −74.3\nβ-Himachalene −85.5 −81.3 −88.6 −68.1 −62.9 −77.2\nHimachalol −77.2 −88.3 −100.8 −63.6 −63.7 −75.6\nα-Humulene −88.9 −90.9 −89.1 −74.9 −70.6 −86.7\nLeptospermone −85.5 −83.2 −92.9 −71.2 −64.1 −80.0\niso-Leptospermone −86.1 −82.7 −93.7 −69.1 −62.6 −83.5\n(R)-Limonene −82.2 −76.2 −92.0 −72.6 −67.3 −79.0\n(S)-Limonene −82.2 −73.8 −92.2 −72.4 −66.1 −77.5\n(R,S,R)-Limonene oxide −86.3 −77.7 −100.8 −76.7 −68.1 −85.1\n(S,R,R)-Limonene oxide −83.5 −87.4 −89.4 −66.7 −63.4 −76.4\n(S,R,S)-Limonene oxide −84.7 −80.7 −95.8 −74.9 −66.7 −83.8\n(R)-Linalool −96.0 −89.3 −101.4 −70.9 −79.0 −87.0\n(S)-Linalool −100.7 −87.5 −102.1 −71.4 −70.4 −87.8\n(R)-Linalyl acetate −101.4 −88.9 −105.1 −73.0 −74.3 −82.5\n(S)-Linalyl acetate −102.8 −90.8 −106.0 −68.5 −74.5 −82.3\np-Mentha-1(7),8-diene −82.3 −82.2 −94.3 −69.5 −65.9 −79.3\n(+)-Menthol −82.9 −86.2 −95.0 −71.8 −66.6 −77.7\n(-)-Menthol −82.3 −84.5 −95.1 −71.1 −69.2 −79.4\nMenthone −83.2 −77.8 −94.7 −69.3 −70.0 −74.4\niso-Menthone −81.0 −79.8 −97.6 −64.4 −63.5 −80.1\nα-Muurolene −86.9 −81.9 −96.9 −72.0 −66.0 −83.7\n(+)-γ-Muurolene −82.3 −82.9 −83.1 −72.2 −66.6 −84.4\n(-)-γ-Muurolene −88.4 −86.2 −106.7 −74.5 −68.5 −86.8\nMyrcene −98.7 −90.1 −102.2 −74.9 −71.4 −84.3\nNeral −102.6 −91.8 −110.5 −81.5 −72.4 −91.2\n(E)-Nerolidol −110.7 −101.4 −113.8 −83.5 −76.1 −100.6\n(E)-β-Ocimene −97.0 −90.2 −103.6 −76.3 −75.6 −86.7\n(Z)-β-Ocimene −98.3 −88.7 −103.2 −78.6 −73.9 −85.1\nOctanal −89.7 −83.8 −99.5 −71.3 −72.4 −80.5\n(R)-2-Octen-3-ol −88.1 −88.4 −96.6 −71.9 −70.7 −81.9\n(S)-1-Octen-3-ol −94.2 −90.7 −93.4 −77.1 −74.7 −80.0\n3-Octanone −88.9 −85.3 −94.7 −71.7 −72.9 −80.3\nPatchouli alcohol −63.5 −57.1 −66.7 −51.8 −43.0 −67.9\n(R)-Phellandral −87.6 −85.9 −102.5 −74.4 −66.2 −81.1\n(S)-Phellandral −87.7 −83.7 −101.6 −74.4 −66.5 −79.2\n(R)-α-Phellandrene −81.1 −82.9 −92.5 −70.1 −65.3 −76.4\n(S)-α-Phellandrene −81.6 −82.5 −92.3 −69.7 −65.6 −76.6\n(R)-β-Phellandrene −84.4 −83.7 −94.0 −69.8 −65.5 −75.2\n(S)-β-Phellandrene −82.9 −84.5 −94.0 −71.2 −67.5 −77.7\nPhytol −106.3 −94.2 −118.9 −74.9 −75.6 −93.3\nPhytone −106.4 −94.3 −116.9 −79.8 −72.3 −90.4\n(+)-α-Pinene −79.0 −70.7 −79.7 −59.4 −54.6 −63.7\n(-)-α-Pinene −77.3 −70.4 −72.9 −61.3 −54.7 −63.6\n(+)-β-Pinene −76.8 −71.8 −79.4 −63.7 −53.0 −65.2\n(-)-β-Pinene −78.8 −73.6 −73.9 −61.9 −56.1 −64.7\n(+)-Pinocamphone −74.9 −72.6 −79.4 −63.2 −62.4 −66.4\n(-)-Pinocamphone −73.2 −79.3 −81.8 −62.0 −61.4 −67.2\n(+)-iso-Pinocamphone −74.9 −75.0 −74.9 −66.6 −55.1 −66.5\n(-)-iso-Pinocamphone −77.1 −80.7 −77.5 −64.0 −55.6 −68.3\n(+)-cis-Pinocarveol −73.9 −78.1 −79.5 −67.7 −57.4 −70.2\n(-)-cis-Pinocarveol −74.1 −76.5 −78.8 −67.0 −58.6 −66.3\n(+)-trans-Pinocarveol −74.7 −80.5 −78.7 −65.8 −57.2 −70.6\n(-)-trans-Pinocarveol −77.6 −80.0 −82.6 −60.5 −55.5 −70.8\n(+)-Piperitone oxide −82.0 −81.5 −98.5 −66.2 −65.2 −77.8\n(-)-Piperitone oxide −81.6 −83.9 −94.9 −68.6 −60.8 −82.8\n(-)-iso-Pulegol −82.5 −85.1 −98.8 −75.2 −66.7 −79.3\n(R)-Pulegone −84.0 −83.1 −96.1 −66.4 −65.5 −78.3\n(S)-Pulegone −83.6 −78.6 −93.3 −67.2 −66.2 −78.9\nRotundifolone −83.1 −79.0 −96.6 −66.4 −62.1 −80.7\n(+)-Sabinene −86.4 −84.0 −92.2 −70.5 −68.6 −77.4\n(-)-Sabinene −87.8 −85.9 −94.7 −71.5 −69.6 −77.0\ncis-Sabinene hydrate −82.4 −81.1 −92.4 −68.0 −60.8 −78.2\n(Z)-α-Santalol −105.7 −95.3 −108.8 −84.7 −70.7 −95.8\n(E)-β-Santalol −104.8 −95.6 −106.2 −77.0 −70.9 −86.6\n(Z)-β-Santalol −104.4 −94.4 −106.2 −79.8 −73.2 −92.2\nβ-Sesquiphellandrene −103.8 −99.0 −115.7 −84.8 −75.3 −101.1\nSpathulenol −90.7 −88.0 −98.4 −77.8 −67.9 −90.4\n(Z)-Spiroether −111.8 −84.9 −103.1 −87.1 −79.3 −102.0\nγ-Terpinene −81.3 −79.3 −93.2 −71.2 −65.3 −76.6\n(R)-Terpinen-4-ol −80.4 −81.9 −89.5 −69.0 −64.9 −75.3\n(S)-Terpinen-4-ol −82.1 −81.8 −88.0 −70.4 −64.4 −76.4\n(R)-α-Terpineol −82.6 −88.3 −91.6 −65.6 −66.0 −72.6\n(S)-α-Terpineol −88.7 −86.8 −94.1 −71.6 −63.5 −82.0\nTerpinolene −80.7 −80.1 −94.7 −68.8 −63.9 −77.4\n(-)-α-Thujone −87.2 −89.3 −94.5 −66.9 −69.2 −78.1\n(+)-β-Thujone −86.9 −80.5 −94.2 −73.7 −69.7 −79.2\nThymohydroquinone dimethyl ether −89.5 −82.8 −104.6 −73.1 −67.0 −85.0\nThymol −84.4 −87.5 −94.6 −72.9 −70.8 −78.4\n2-Undecanone −101.3 −94.0 −108.3 −78.4 −72.8 −90.2\nValencene −84.7 −81.7 −92.6 −74.4 −68.3 −81.7\n(+)-Verbenone −84.7 −73.2 −82.5 −68.4 −54.8 −71.2\n(-)-Verbenone −83.8 −77.7 −77.4 −65.4 −57.8 −68.0\nViridiflorene −86.8 −90.2 −91.0 −76.3 −69.4 −88.8\nα-Zingiberene −106.4 −100.5 −115.4 −82.7 −71.4 −98.6\na Human angiotensin-converting enzyme 2 (hACE2).\nTable 4 Normalized docking scores ( DSnorm, kJ/mol) of essential oil components with bovine odorant binding protein (BtOBP), cruzain, torpedo acetylcholinesterase (TcAChE), Bacillus anthracis nicotinate mononucleotide adenylytransferase (BaNadD), Russell’s viper phospholipase A2 (DrPLA2), and Escherichia coli l-aspartate aminotransferase (EcAspTA).\nCompound BtOBP Cruzain TcAChE BaNadD DrPLA2 EcAspTA\n1GT3 1ME3 6G1U 3HFJ 1FV0 2Q7W\n(E)-Anethole −90.2 −73.3 −96.8 −112.9 −85.3 −88.1\nallo-Aromadendrene −85.0 −70.6 −92.8 −105.8 −87.8 −79.6\nArtemiseole −84.8 −74.2 −84.2 −90.6 −68.0 −71.7\n(R)-Artemisia alcohol −88.4 −68.3 −89.5 −94.8 −80.7 −81.5\n(S)-Artemisia alcohol −86.1 −74.0 −94.8 −101.4 −82.5 −81.4\nArtemisia ketone −93.1 −77.3 −91.5 −107.9 −87.8 −80.6\nAscaridole −79.7 −54.4 −72.1 −79.7 −75.0 −65.3\nBenzyl benzoate −105.0 −82.8 −115.8 −128.1 −97.3 −89.9\n(Z)-trans-α-Bergamotol −1 00.7 −73.6 −107.0 −94.2 −92.6 −85.8\nBicyclogermacrene −97.5 −82.4 −95.6 −105.5 −89.7 −89.0\nBicyclosesquiphellandrene −92.2 −52.5 −91.2 −110.7 −88.4 −75.7\nα-Bisabolol oxide A −94.7 −66.1 −102.8 −102.6 −77.1 −82.7\nα-Bisabolol oxide B −104.6 −90.4 −107.0 −121.9 −94.2 −89.8\nBisabolone oxide A −100.1 −71.9 −96.8 −84.7 −81.2 −86.7\n(+)-Borneol −72.5 −51.0 −72.0 −47.8 −61.4 −62.5\n(-)-Borneol −78.3 −53.1 −70.8 −49.0 −63.3 −56.2\n(+)-iso-Borneol −73.7 −55.6 −74.6 −31.0 −60.9 −59.7\n(-)-iso-Borneol −73.2 −55.3 −77.7 −52.6 −51.0 −57.4\nα-Bulnesene −93.4 −89.3 −109.3 −115.7 −94.4 −95.3\nδ-Cadinene −79.5 −86.8 −105.1 −116.8 −94.8 −82.3\nΤ-Cadinol −87.8 −71.8 −117.7 −121.7 −86.0 −87.0\n(R)-Calamene −80.3 −84.4 −116.5 −120.4 −91.3 −87.7\n(S)-Calamene −80.1 −82.5 −116.2 −121.8 −93.0 −88.3\n(+)-Camphene −79.0 −62.1 −77.0 −75.9 −69.3 −67.5\n(-)-Camphene −77.7 −62.8 −75.2 −77.4 −71.3 −70.6\n(+)-Camphor −76.0 −57.0 −75.0 −49.0 −53.5 −54.1\n(-)-Camphor −80.0 −54.1 −74.4 −52.9 −61.2 −56.4\n(+)-δ-3-Carene −80.4 −64.2 −80.6 −88.0 −71.8 −72.5\n(-)-δ-3-Carene −82.0 −68.9 −84.4 −90.2 −72.8 −72.9\nCarvacrol −82.4 −77.7 −94.8 −106.7 −81.6 −87.5\nCarvacrol methyl ether −85.6 −79.3 −96.6 −111.5 −84.2 −93.6\n(+)-cis-Carveol −89.1 −77.3 −96.9 −109.4 −81.3 −87.6\n(-)-cis-Carveol −89.0 −82.1 −95.5 −109.0 −83.2 −89.4\n(R)-Carvone −86.0 −80.7 −94.6 −109.9 −83.5 −91.5\n(S)-Carvone −88.0 −77.2 −94.1 −105.9 −82.8 −87.2\n(E)-Caryophyllene −87.3 −60.4 −88.1 −87.3 −87.4 −78.6\nCaryophyllene oxide −95.1 −73.1 −90.1 −97.0 −83.8 −77.8\nCedrol −87.7 −63.1 −96.4 −84.4 −86.3 −70.9\nepi-Cedrol −84.0 −59.7 −83.3 −86.7 −80.0 −76.2\nChamazulene −95.2 −89.2 −123.0 −132.1 −98.9 −101.6\n(-)-cis-Chrystanthyl acetate −85.8 −63.7 −89.8 −73.8 −76.5 −71.5\n(-)-trans-Chrysanthenyl acetate −80.9 −69.7 −82.4 −78.5 −76.5 −68.6\n1,8-Cineole −69.3 −51.1 −73.2 −54.4 −49.4 −47.3\n(E)-Cinnamaldehyde −87.7 −77.6 −98.2 −110.1 −85.7 −89.5\n(E)-Cinnamyl acetate −95.9 −88.2 −107.4 −132.5 −94.6 −103.1\n(R)-Citronellal −98.1 −90.5 −109.3 −120.7 −88.3 −105.7\n(S)-Citronellal −95.0 −89.7 −108.5 −123.3 −86.9 −104.1\n(R)-Citronellol −91.0 −90.0 −108.2 −122.4 −88.6 −107.7\n(S)-Citronellol −92.5 −91.9 −108.5 −122.0 −90.3 −100.3\n(R)-Citronellyl formate −98.0 −93.5 −118.7 −129.5 −87.5 −108.5\n(S)-Citronellyl formate −99.7 −95.1 −111.2 −135.6 −91.5 −94.8\nα-Copaene −88.9 −69.9 −84.6 −78.7 −81.7 −61.9\nCostunolide −106.8 −87.5 −116.7 −120.1 −100.3 −89.1\n(R)-Cryptone −74.9 −68.1 −92.2 −100.0 −78.5 −80.8\n(S)-Cryptone −79.0 −68.5 −91.6 −100.7 −82.7 −79.6\nβ-Cubebene −99.8 −67.2 −106.9 −112.2 −93.9 −94.8\nCuminaldehyde −84.9 −79.1 −95.3 −109.1 −90.1 −89.5\nar-Curcumene −98.1 −87.5 −116.0 −125.7 −94.1 −95.3\nCurcumol −90.1 −67.6 −100.4 −88.0 −87.6 −81.5\nCurdione −96.4 −75.1 −99.3 −116.3 −91.0 −78.7\nCurzerene −96.4 −80.3 −109.4 −89.7 −91.1 −86.4\nm-Cymene −78.9 −73.1 −96.1 −99.1 −76.6 −88.0\no-Cymene −77.0 −61.9 −89.8 −97.8 −76.2 −77.2\np-Cymene −82.8 −73.2 −91.3 −96.8 −80.9 −84.3\n(E)-β-Damascenone −90.1 −80.5 −100.7 −105.4 −88.9 −80.0\n(2E,4E)-Decadienal −96.4 −87.0 −110.4 −129.7 −95.8 −114.8\nDodecanal −95.8 −83.7 −110.3 −127.3 −89.2 −108.9\nEremanthin −80.1 −87.9 −121.3 −132.4 −98.7 −91.8\nβ-Eudesmol −95.2 −76.1 −98.6 −114.1 −85.3 −87.1\nγ-Eudesmol −94.9 −78.2 −106.1 −105.2 −89.7 −89.1\nEugenol −90.4 −82.4 −103.9 −119.3 −87.3 −98.8\nEugenol methyl ether −93.6 −78.1 −106.3 −116.8 −89.3 −94.4\nEugenyl acetate −94.9 −83.4 −109.2 −126.1 −100.1 −104.6\n(E,E)-α-Farnesene −115.5 −103.7 −129.8 −131.8 −101.2 −111.4\n(E)-β-Farnesene −112.1 −103.2 −122.7 −131.8 −105.3 −108.6\n(E,E)-Farnesol −116.8 −96.2 −133.0 −135.6 −100.5 −109.0\n(+)-Fenchone −78.4 −60.5 −79.5 −79.8 −62.4 −69.9\n(-)-Fenchone −80.3 −61.5 −81.0 −84.2 −65.5 −60.7\nFlavesone −87.1 −56.0 −88.6 −92.1 −85.2 −80.3\nGeranial −96.5 −94.9 −111.7 −119.3 −92.1 −101.5\nGeraniol −95.5 −93.6 −109.7 −118.0 −94.3 −107.3\nGeranyl formate −100.2 −89.7 −115.4 −128.3 −94.8 −114.1\nGermacrene D −102.4 −88.8 −109.9 −116.5 −93.7 −90.0\nGermacrone −92.4 −68.3 −94.5 −102.9 −88.3 −80.0\nGuiaol −100.8 −88.5 −113.3 −107.5 −92.6 −94.0\nα-Gurjunene −80.6 −61.6 −84.6 −100.0 −83.6 −78.1\nβ-Gurjunene −89.3 −38.8 −80.3 11.3 −77.6 −71.1\nα-Himachalene −89.2 −67.9 −83.9 −96.3 −87.6 −73.4\nβ-Himachalene −81.9 −65.4 −96.1 −110.8 −91.4 −76.8\nHimachalol −91.5 −64.1 −81.2 −24.7 −81.7 −66.3\nα-Humulene −94.0 −80.0 −89.9 −113.6 −89.2 −82.5\nLeptospermone −89.6 −64.0 −92.2 −102.7 −88.8 −80.7\niso-Leptospermone −92.8 −63.0 −90.1 −99.4 −86.2 −78.2\n(R)-Limonene −86.2 −75.7 −92.4 −99.6 −81.7 −86.8\n(S)-Limonene −84.9 −77.6 −93.4 −99.8 −83.3 −87.3\n(R,S,R)-Limonene oxide −87.1 −76.0 −93.2 −110.7 −84.9 −86.3\n(S,R,R)-Limonene oxide −84.6 −68.8 −85.0 −84.3 −76.2 −69.8\n(S,R,S)-Limonene oxide −91.2 −73.8 −97.4 −93.6 −85.1 −87.9\n(R)-Linalool −95.5 −89.9 −116.6 −112.4 −90.3 −89.9\n(S)-Linalool −93.0 −88.9 −110.1 −111.9 −91.0 −95.7\n(R)-Linalyl acetate −96.9 −87.1 −107.1 −112.5 −87.1 −95.2\n(S)-Linalyl acetate −100.0 −90.5 −110.2 −114.3 −86.6 −87.1\np-Mentha-1(7),8-diene −83.3 −74.4 −93.6 −100.0 −82.9 −84.9\n(+)-Menthol −86.1 −66.4 −98.6 −106.1 −79.2 −90.8\n(-)-Menthol −81.0 −68.9 −97.5 −106.3 −80.5 −89.7\nMenthone −82.4 −72.0 −92.6 −98.2 −82.8 −83.5\niso-Menthone −79.9 −64.8 −88.2 −102.4 −75.1 −82.0\nα-Muurolene −91.2 −79.9 −95.6 −113.7 −90.0 −82.8\n(+)-γ-Muurolene −85.2 −77.0 −98.7 −113.9 −93.2 −78.7\n(-)-γ-Muurolene −83.1 −83.4 −96.9 −106.3 −82.9 −80.5\nMyrcene −90.4 −88.8 −109.0 −112.7 −90.3 −101.1\nNeral −95.1 −94.1 −111.1 −122.8 −90.9 −105.4\n(E)-Nerolidol −111.5 −101.8 −131.9 −131.3 −99.6 −110.5\n(E)-β-Ocimene −91.8 −89.4 −104.6 −116.4 −89.0 −97.0\n(Z)-β-Ocimene −89.7 −90.6 −106.8 −112.1 −90.3 −94.4\nOctanal −85.8 −79.8 −97.6 −112.0 −85.7 −102.7\n(R)-2-Octen-3-ol −84.3 −81.5 −106.9 −107.1 −83.3 −101.1\n(S)-1-Octen-3-ol −84.5 −82.4 −108.4 −105.9 −85.0 −99.5\n3-Octanone −84.2 −82.5 −102.6 −111.6 −82.9 −101.8\nPatchouli alcohol −75.1 −41.4 −71.1 100.1 −10.1 −49.2\n(R)-Phellandral −92.3 −79.3 −97.4 −108.1 −88.9 −89.5\n(S)-Phellandral −92.9 −79.9 −96.1 −109.2 −88.9 −88.8\n(R)-α-Phellandrene −84.0 −69.7 −94.7 −100.8 −82.4 −83.8\n(S)-α-Phellandrene −84.3 −69.6 −93.5 −99.4 −82.6 −80.6\n(R)-β-Phellandrene −82.2 −69.9 −93.5 −102.0 −80.6 −84.1\n(S)-β-Phellandrene −83.8 −69.0 −93.2 −100.5 −80.2 −81.2\nPhytol −112.8 −93.8 −132.4 −134.7 −102.4 −112.9\nPhytone −117.8 −92.1 −124.5 −131.1 −99.7 −107.2\n(+)-α-Pinene −74.2 −58.0 −73.4 −62.4 −62.5 −54.4\n(-)-α-Pinene −72.8 −58.3 −70.4 −64.6 −61.7 −57.2\n(+)-β-Pinene −70.9 −57.8 −74.0 −64.1 −60.9 −55.5\n(-)-β-Pinene −73.5 −58.4 −73.1 −65.0 −63.7 −57.0\n(+)-Pinocamphone −76.5 −58.2 −73.6 −53.1 −55.4 −63.6\n(-)-Pinocamphone −76.6 −66.1 −76.5 −65.9 −72.3 −62.7\n(+)-iso-Pinocamphone −75.3 −59.0 −76.6 −54.0 −59.1 −58.1\n(-)-iso-Pinocamphone −76.2 −59.6 −76.7 −56.4 −65.8 −56.2\n(+)-cis-Pinocarveol −75.7 −58.2 −75.2 −51.7 −57.5 −58.1\n(-)-cis-Pinocarveol −75.7 −63.9 −73.5 −52.5 −66.3 −54.5\n(+)-trans-Pinocarveol −77.5 −60.6 −76.5 −71.1 −63.9 −61.4\n(-)-trans-Pinocarveol −72.4 −58.6 −77.2 −71.4 −56.3 −62.6\n(+)-Piperitone oxide −88.5 −70.5 −100.5 −104.2 −80.4 −78.0\n(-)-Piperitone oxide −86.0 −73.6 −99.6 −104.5 −80.7 −83.8\n(-)-iso-Pulegol −85.1 −72.0 −93.5 −106.7 −83.5 −93.8\n(R)-Pulegone −81.8 −69.9 −90.3 −103.9 −78.4 −74.4\n(S)-Pulegone −79.7 −69.6 −89.3 −99.9 −81.5 −76.4\nRotundifolone −86.1 −72.1 −96.1 −100.0 −82.4 −72.1\n(+)-Sabinene −87.9 −66.6 −84.5 −92.1 −80.5 −78.2\n(-)-Sabinene −79.7 −68.4 −91.4 −96.0 −80.8 −75.8\ncis-Sabinene hydrate −88.1 −70.2 −84.5 −91.1 −72.3 −68.1\n(Z)-α-Santalol −108.5 −85.6 −113.4 −106.8 −96.8 −90.7\n(E)-β-Santalol −105.0 −90.2 −110.6 −113.3 −94.3 −94.0\n(Z)-β-Santalol −108.0 −85.3 −110.4 −110.9 −96.5 −92.6\nβ-Sesquiphellandrene −103.9 −92.2 −116.6 −127.5 −99.4 −98.3\nSpathulenol −95.9 −94.8 −97.7 −102.8 −84.3 −102.2\n(Z)-Spiroether −112.8 −85.5 −124.3 −136.1 −101.5 −102.9\nγ-Terpinene −84.3 −74.9 −93.4 −98.7 −82.8 −85.9\n(R)-Terpinen-4-ol −87.3 −66.7 −81.5 −94.0 −80.2 −72.2\n(S)-Terpinen-4-ol −87.1 −67.2 −78.9 −92.3 −80.2 −71.7\n(R)-α-Terpineol −82.0 −68.0 −80.3 −82.2 −77.6 −71.3\n(S)-α-Terpineol −76.9 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Oils as Antiviral Agents, Potential of Essential Oils to Treat SARS-CoV-2 Infection: An In-Silico Investigation\n\nAbstract\nEssential oils have shown promise as antiviral agents against several pathogenic viruses. In this work we hypothesized that essential oil components may interact with key protein targets of the 2019 severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2). A molecular docking analysis was carried out using 171 essential oil components with SARS-CoV-2 main protease (SARS-CoV-2 Mpro), SARS-CoV-2 endoribonucleoase (SARS-CoV-2 Nsp15/NendoU), SARS-CoV-2 ADP-ribose-1″-phosphatase (SARS-CoV-2 ADRP), SARS-CoV-2 RNA-dependent RNA polymerase (SARS-CoV-2 RdRp), the binding domain of the SARS-CoV-2 spike protein (SARS-CoV-2 rS), and human angiotensin−converting enzyme (hACE2). The compound with the best normalized docking score to SARS-CoV-2 Mpro was the sesquiterpene hydrocarbon (E)-β-farnesene. The best docking ligands for SARS−CoV Nsp15/NendoU were (E,E)-α-farnesene, (E)-β-farnesene, and (E,E)−farnesol. (E,E)−Farnesol showed the most exothermic docking to SARS-CoV-2 ADRP. Unfortunately, the docking energies of (E,E)−α-farnesene, (E)-β-farnesene, and (E,E)−farnesol with SARS-CoV-2 targets were relatively weak compared to docking energies with other proteins and are, therefore, unlikely to interact with the virus targets. However, essential oil components may act synergistically, essential oils may potentiate other antiviral agents, or they may provide some relief of COVID-19 symptoms.\n\n1. Introduction\nThe 2019 severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) is a newly emerging respiratory illness. The epidemic started in December 2019 in Wuhan, China, and has rapidly spread throughout China and the world and is now a global pandemic. SARS-CoV-2 can be efficiently transmitted among humans and has shown a high degree of morbidity and mortality [1,2]. As of April 20, 2020, the worldwide number of infected individuals was 2,544,792, with as many as 175,694 deaths [3]. There are currently no approved vaccines available for the prevention of SARS-CoV-2 infection and only just recently, remdesivir has received “emergency use authorization” for treatment of COVID-19 in the United States; therefore, there is an urgent demand for potential chemotherapeutic agents to treat this disease.\nEssential oils have been screened against several pathogenic viruses (Table 1), including influenza and other respiratory viral infections. Influenza is an infectious respiratory disease caused by one of three types of influenza viruses, type A, type B, or type C [4]. The most significant in terms of human morbidity and mortality is influenza virus type A, which is found in several bird and mammal species [5]. Several different serotypes of influenza type A have caused global flu pandemics [6]: H1N1, which caused the Spanish flu in 1918 (40–50 million deaths worldwide) [7] and the swine flu in 2009 [8]; the Asian flu of 1957–1958 (ca. 1.5 million deaths worldwide) was caused by influenza A H2N2 [8]; serotype H3N2 caused the Hong Kong flu in 1968 [9]; and H5N1, which caused the bird flu in 2004 [10]. Influenza virus type B, however, is largely confined to human hosts [11].\nOne study evaluated the in vitro antiviral effect against influenza type A (H1N1) of commercial essential oils that included cinnamon (Cinnamomum zeylanicum), bergamot (Citrus bergamia), lemongrass (Cymbopogon flexuosus), thyme (Thymus vulgaris), and lavender (Lavandula angustifolia). The oils were tested in the liquid phase at a concentration of 0.3% and in the vapor phase. The oils of cinnamon, bergamot, thyme, and lemongrass displayed 100% inhibition of H1N1 in the liquid phase, while the inhibition for lavender essential oil was 85%. However, in the vapor phase, 100% inhibition was observed only for cinnamon leaf essential oil after 30 min of exposure. The bergamot, lemongrass, thyme, and lavender essential oils displayed inhibition rates of 95%, 90%, 70%, and 80%, respectively [12].\nCinnamomum zeylanicum leaf oil is characterized by eugenol (75–85%), followed by smaller amounts of linalool (1.6–8.5%), and benzyl benzoate (0.1–8.3%) [13,14,15]. Bergamot oil is rich in limonene (23–55%), linalool (2–37%), and linalyl acetate (12–41%), with lesser quantities of β-pinene (up to 10%) and γ-terpinene (up to 10%) [16,17,18,19,20]. Geranial (48–54%) and neral (29–33%) have been reported as the major components of C. flexuosus, but many chemotypes, cultivars, and variants have been reported for C. flexuosus [21,22].\nIn the literature, there have been at least 20 different chemotypes identified for thyme essential oil. The “typical” thyme essential oil presents a thymol content of 45% (range 31–50%), with significant concentrations of p-cymene (0.1–26.6%, average = 15.6%) and γ-terpinene (up to 22.8%, average = 9.3%). In addition, there are several other chemotypes of T. vulgaris rich in thymol and/or carvacrol [23]. Thymol has been identified as an anti-influenza agent against influenza type A and parainfluenza type 3 virus [24,25]. Lavandula angustifolia essential oil is rich in linalyl acetate (37.0–43.6%), linalool (19.7–39.1%), geraniol (up to 9.3%), β-caryophyllene (up to 5.1%), terpinen-4-ol (up to 14.9%), lavandulyl acetate (up to 5.5%), and borneol (up to 6.4%) [26,27,28,29].\nAnother essential oil with notable anti-influenza effects is tea tree, which is extracted from the leaves of Melaleuca alternifolia (Myrtaceae). Commercial tea tree oil is composed of terpinen-4-ol (30–48%), γ-terpinene (10–28%), α-terpinene (5–13%), 1,8-cineole (up to 15%), terpinolene (1.5–5%), p-cymene (0.5–12%), α-pinene (1–6%), and α-terpineol (1.5–8%) [30]. Tea tree oil showed 100% inhibition of influenza type A (H1N1) virus at 0.01% concentration and a median inhibitory concentration (IC50) of 6 μg/mL [31,32]. In addition, 30 min exposure of type A (H11N9) virus to tea tree oil vapor caused 100% inhibition [33]. The tea tree oil components, terpinen-4-ol, terpinolene, and α-terpineol, have shown anti-influenza virus activity against type A (H1N1), with IC50 values of 25, 12, and 250 μg/mL, respectively. α-Terpinene, γ-terpinene, and p-cymene were inactive, however [31].\nAvian influenza viruses (H5N1) exhibit both high and low virulence in numerous mammalian species, highlighting the connection between the route of inoculation and virus pathogenicity [34]. Since 2003, there have been over 600 documented cases of human infection with H5N1 viruses, with most cases among young, previously healthy individuals [35]. The essential oils extracted from Citrus reshni leaves and peel (unripe and ripe fruits) were tested against H5N1 virus by plaque reduction assay. The oils showed moderate inhibition of the H5N1 virus at a concentration of 2.5 μL/mL. Sabinene (40.5%), linalool (23.3%), and terpinen-4-ol (8.3%) were the main constituents in the leaf oil while limonene (82.4%, 91.6%) was the main compound in the fruit peel essential oils (unripe and ripe, respectively) [36].\nThe essential oil of leaves of Fortunella margarita is rich in the sesquiterpenoids β-eudesmol (28.3%), α-muurolene (10.3%), β-gurjunene (10.0%), γ-eudesmol (8.4%), and γ-muurolene (6.6%) while the essential oil extracted from the fruits showed monterpenoids as the main components, α-terpineol (55.5%), carvone (5.7%), and carveol (5.5%). Both samples were tested for antiviral activity against avian influenza (H5N1) virus, and the obtained results revealed that the fruit essential oil was more effective (80% virus inhibition by the MTT (3-(4,5-dimethylthiazol-2-yl)-2,5-diphenyltetrazolium bromide) assay using Madin−Darby canine kidney (MDCK) cells for virus propagation). The IC50 values obtained for the leaf and fruit essential oils were 38.89 and 6.77 μg/mL, respectively [53].\nDengue fever, a mosquito−borne disease, is caused by dengue virus (DENV) which includes four major serotypes (DENV-1, -2, -3, and -4). Some serotypes cause more severe diseases than others; severe dengue is associated with secondary infections by a different serotype. Dengue disease is a major public health problem in developing tropical countries and has being continuously spreading to new geographical areas [92]. The essential oils of two species of Lippia were assayed against four dengue serotypes (DENV-1, DENV-2, DENV-3, DENV-4) [61]. The IC50 values for Lippia alba oil, rich in carvone (39.7%), limonene (30.6%), and bicyclosesquiphellandrene (8.9%), were between 0.4 and 32.6 μg/mL. However, the Lippia citrodora essential oil, composed of geranial (18.9%), neral (15.6%), limonene (10.7%), and 1,8-cineole (5.0%), showed the best activity, with IC50 values varying from 1.9 to 33.7 μg/mL. No viral inhibitory effect was observed by addition of the essential oil after virus adsorption; the inhibitory effect of the essential oil seemed to cause direct virus inactivation before adsorption on the host cell.\nThe essential oils of seven aromatic plants from Córdoba, San Luis, and San Juan provinces (Argentina) were screened for cytotoxicity and in vitro inhibitory activity against dengue virus type 2 (DENV−2) [38]. The oils of Jungia polita and Buddleja cordobensis were composed of caryophyllene oxide (9.18%, 32.1%) and β-caryophyllene (8.13%, 16.5%) as the major compounds. However, these oils displayed different IC50 values (86.4 and 39.8 μg/mL, respectively). The other samples were composed mostly of monoterpenes and displayed lower activity, except Pectis odorata oil, which presented limonene (50.2%), neral (27.2%), and geranial (23.6%) as the major compounds and an IC50 value of 39.6 μg/mL. In addition, the essential oils of Artemisia mendozana, rich in camphor (22.4%), artemisole (11.7%), and artemisia alcohol (10.8%); Gailardia megapotamica composed of β-pinene (35.5%), spathulenol (10.7%), and germacrene D (6.8%); and Heterothalamus alienus characterized by β-pinene (35.5%), spathulenol (10.7%), and germacrene D (6.8%), showed an average IC50 value of 130.63 μg/mL.\nYellow fever (YF), caused by yellow fever virus (YFV), has historically been considered one of the most dangerous infectious diseases. YFV is transmitted to humans via mosquitoes of the Haemogogus, Sabethes, and Aedes genera. Annually, there are approximately 80,000–200,000 YFV cases worldwide, with a case fatality rate (CFR) ranging from 20–60% [93,94]. Essential oils of Lippia species and their main compounds have been tested against yellow fever virus (YFV) in Vero cells. The oil of Lippia origanoides showed carvacrol (44.0%), thymol (15.0%), and γ-terpinene (10.0%) as the main compounds and displayed 100% inhibition at a concentration of 11.1 μg/mL [43]. However, in the same study, the oil of L. alba displayed 100% inhibition at a concentration of 100.0 μg/mL. The major compounds were carvone (51.0%), limonene (33.0%), and bicyclosesquiphellandrene (7.0%). The essential oil of L. alba with a similar chemical composition, carvone (39.7%), limonene (30.6%), and bicyclosesquiphellandrene (8.9%), displayed an IC50 value of 4.3 μg/mL against YFV when tested in Vero cells using the MTT assay [62]. The essential oil of L. citriodora, dominated by geranial (18.9%), neral (15.6%), and limonene (10.7%), did not display a statistical difference in comparison to citral, with IC50 values of 19.4 and 17.6 μg/mL, respectively [62].\nIn addition to essential oils, several individual essential oil components have been screened for antiviral activity (Table 2).\nBecause of the activities of several essential oils and essential oil components against human pathogenic viruses, we hypothesized that essential oil components may be potentially useful as antiviral agents against SARS-CoV-2. In this work, we carried out a molecular docking analysis of the major components of essential oils that exhibit antiviral activity (Table 1 and Table 2) with known SARS-CoV-2 protein targets.\n\n2. Results and Discussion\nSeveral proteins have been identified for severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2), which may serve as potential targets for chemotherapeutic intervention in coronavirus disease 2019 (COVID-19). These protein targets include SARS-CoV-2 main protease (SARS-CoV-2 Mpro), SARS-CoV-2 endoribonucleoase (SARS-CoV-2 Nsp15/NendoU), SARS-CoV-2 ADP−ribose−1″−phosphatase (SARS-CoV-2 ADRP), SARS-CoV-2 RNA-dependent RNA polymerase (SARS-CoV-2 RdRp), the binding domain of the SARS-CoV-2 spike protein (SARS-CoV-2 rS), and human angiotensin−converting enzyme (hACE2). There have already been several molecular docking studies on these macromolecular targets. Several groups have carried out molecular docking of natural product libraries with SARS-CoV-2 Mpro [102,103,104,105]. Additionally, commercially available drugs have also been examined using in silico methods [106,107].\nA molecular docking study was carried out with 171 essential oil components with SARS-CoV-2 Mpro (PDB: 5R7Z, 5R80, 5R81, 5R82, 5R83, 5R84, 6LU7, 6M03, and 6Y84), SARS-CoV-2 Nsp15/NendoU (PDB: 6VWW, 6W01, and 6W02), SARS-CoV-2 rS (PDB: 6M0J, 6M17, 6VX1, and 6VW1), and SARS-CoV-2 RdRp (PDB: 6M71). The best docking scores are summarized in Table 3.\nThe main protease, SARS-CoV-2 Mpro, is a cysteine protease that is essential for processing the polyproteins that are translated from the coronavirus RNA [108]. The substrate binding site of the enzyme is a cleft flanked by Gln189, Met49, Pro168, Glu166 and His41; the active site is Cys145 and His41. The compound with the best normalized docking score to SARS-CoV-2 Mpro was the sesquiterpene hydrocarbon (E)-β-farnesene (DSnorm = −115.4 kJ/mol). Other essential oil components showing good docking scores with SARS-CoV-2 Mpro were (E,E)-α-farnesene (DSnorm = −115.0 kJ/mol), (E,E)-farnesol (DSnorm = −112.4 kJ/mol), and (E)-nerolidol (DSnorm = −110.7 kJ/mol). The sesquiterpene hydrocarbons (E,E)-α-farnesene and (E)-β-farnesene occupy the substrate binding site, flanked by Gln189, Arg188, Met165, His41, and Asp 187 (Figure 1). The lowest-energy docked poses of both (E,E)-farnesol and (E)-nerolidol showed hydrogen bonding of the alcohol moiety to Gln192 and Thr190 and, in the case of (E)-nerolidol, also with GLN189 and ARG188 (Figure 2).\nNon-structural protein 15 (Nsp15) of SARS-CoV-2 is an endoribonuclease that preferentially cleaves RNA at uridylate. Furthermore, it has been shown that SARS-CoV Nsp15/NendoU is required for successful viral infection [109]. The best docking ligands for SARS-CoV Nsp15/NendoU are (E,E)-α-farnesene (DSnorm = −107.5 kJ/mol), (E)-β-farnesene (DSnorm = −105.0 kJ/mol), (E,E)-farnesol (DSnorm = −104.6 kJ/mol), and (E)-nerolidol (DSnorm = −101.6 kJ/mol). All of these sesquiterpenoids preferentially docked into a binding site formed by amino acid residues Gln347, Ile328, Val276, Ser274, Thr275, Ser329, Asn74, Asn75, Glu327, and Lys71 (Figure 3). In addition to van der Waals interactions, (E,E)-farnesol showed hydrogen-bonding interactions with Ser329 and Glu327, while (E)-nerolidol hydrogen bonded with Asn75 and Lys71 (Figure 3). Unfortunately, the docking scores for these ligands as well as the scores of the other essential oil components with this protein are too low for it to be considered a viable target (see Table 3).\nADP ribose phosphatase (ADRP) serves to convert ADP-ribose 1″-monophosphate (Appr-1″-p) to ADP-ribose (Appr), which serves to regulate virus replication [110]. This enzyme may be dispensable in SARS-CoV-2, however [111]. Nevertheless, (E,E)-farnesol showed the most exothermic docking to SARS-CoV-2 ADRP with DSnorm = −121.4 kJ/mol. The binding site in SARS-CoV-2 ADRP is surrounded by Phe132, Asn40, Ile131, Ala38, and Ala39, with hydrogen-bonded interactions between the ligand alcohol and Asn40 (Figure 4). Additional essential oil components with good docking scores with SARS-CoV-2 ADRP include the sesquiterpene hydrocarbons (E)-β-farnesene (DSnorm = −116.3 kJ/mol), (E,E)-α-farnesene (DSnorm = −114.2 kJ/mol), β-sesquiphellandrene (DSnorm = −115.7 kJ/mol), and α-zingiberene (DSnorm = −115.4 kJ/mol); the diterpenoids phytol (DSnorm = −118.9 kJ/mol) and phytone (DSnorm = −116.9 kJ/mol); and the phenylpropanoid eugenyl acetate (DSnorm = −115.4 kJ/mol). Not surprisingly, β-sesquiphellandrene and α-zingiberene adopted the same docking orientation in the binding site of the enzyme (Figure 5A). Similarly, phytol and phytone occupy the same location in the binding site (Figure 5B).\nRNA-dependent RNA polymerase catalyzes RNA replication from an RNA template and is an essential enzyme in RNA viruses. Because these enzymes are crucial in viral replication, they are viable targets in antiviral chemotherapy [112]. Molecular docking of essential oil components with SARS-CoV-2 RdRp showed only weak docking with this enzyme target (Table 3). The ligand with the best docking score was (E,E)-farnesol, with DSnorm = −89.6 kJ/mol.\nThe SARS-CoV-2 spike protein serves to attach to angiotensin-converting enzyme 2 (ACE2) of the human cell to be invaded. The interface between SARS-CoV-2 rS and human ACE2 would be a promising target to prevent binding of SARS-CoV-2 rS to human ACE2 [113,114]. The best docking ligands with human ACE2, i.e., normalized docking scores \u003c -100 kJ/mol (α-bulnesene, eremanthin, (E,E)-α-farnesene, (E)-β-farnesene, (E,E)-farnesol, (E)-nerolidol, β-sesquiphellandrene, and (Z)-spiroether), all show docking preference to a cavity removed from the interaction interface between the SARS-CoV-2 spike protein and ACE2 (Figure 6). This cavity is a pocket surrounded by residues Pro565, Leu95, Val209, Asn210, Leu91, Lys94, Glu208, and Glu564. Because of the remote location of docking with ACE2, it is predicted that interaction of essential oil components with ACE2 will not prevent protein–protein interaction between the SARS-CoV-2 spike protein and human ACE2.\nOn the other hand, the lowest energy poses of essential oil components showing the strongest docking (\u003c−80 kJ/mol; (E)-cinnamyl acetate, eremanthin, (E,E)-α-farnesene, (E)-β-farnesene, (E,E)-farnesol, and geranyl formate) with the binding domain of the SARS-CoV-2 spike protein do lie at the interface between the SARS-CoV-2 spike protein and human ACE2 (Figure 6). This docking site is a hydrophobic pocket formed by Tyr505, Tyr495, Asn501, Arg403, Tyr453, and Gly502. Unfortunately, the docking energies at this site are too weak and are unlikely, therefore, to disrupt binding between SARS-CoV-2 rS and human ACE2.\nIn order to compare docking scores of the essential oil components with other proteins, docking was also carried out with six randomly selected non-virus proteins: Bovine odorant binding protein (BtOBP, PDB: 1GT3), cruzain (PDB: 1ME3), torpedo acetylcholinesterase (TcAChE, PDB: 6G1U), Bacillus anthracis nicotinate mononucleotide adenylytransferase (BaNadD, PDB: 3HFJ), Russell’s viper phospholipase A2 (DrPLA2, PDB: 1FV0), and Escherichia coli l-aspartate aminotransferase (EcAspTA, PDB: 2Q7W). Docking scores for these proteins are summarized in Table 4.\nThe docking results of the essential oil components with the six randomly selected proteins indicate the best docking ligands to SARS-CoV-2 targets (i.e., (E,E)-α-farnesene, (E)-β-farnesene, and (E,E)-farnesol) have better docking energies with other proteins. These three sesquiterpenes have docking energies of −129.8, −122.7, and −133.0 kJ/mol with TcAChE, respectively, and −131.8, −131.8, and −135.6 kJ/mol, respectively, with BaNadD. Indeed, most of the essential oil ligands have better docking properties with one or more of the random proteins compared to the SARS-CoV-2 proteins.\nBased on the docking energies of essential oil components with key protein targets of SARS-CoV-2, the individual essential oil components cannot be considered viable chemotherapeutic agents for interaction with the SARS-CoV-2 target proteins. However, essential oils are complex mixtures of compounds and several essential oil components may act synergistically to inhibit the virus. Astani and co-workers have shown, for example, that the antiviral activity (HSV-1) of Eucalyptus oil is much greater than the major component 1,8-cineole, and that tea tree oil has a greater antiviral activity than its components terpinen-4-ol, γ-terpinene, and α-terpinene [52].\nSynergistic effects have also been observed between essential oils and synthetic antiviral agents. Civitelli and co-workers observed an antiviral synergism between Mentha suaveolens essential oil and acyclovir on HSV-1 [64]. Likewise, Melissa officinalis essential oil potentiated the activity of oseltamivir against avian influenza virus H9N2 [115]. Furthermore, essential oils are lipophilic and therefore may also serve to disintegrate viral membranes [116].\nOutside of antiviral activity, there may be some relief of symptoms of COVID-19 provided by essential oils. For example, linalool [117,118], β-caryophyllene [119,120], and 1,8-cineole [121,122] have both anti-inflammatory and antinociceptive activity; menthol [123,124], camphor [125,126], and thymol [127] have antitussive activities.\n\n3. Materials and Methods\n\n3.1. Bibliographic Search Criteria\nThe bibliographic research was performed using the databases Google Scholar, Pubmed, Science Direct, Medline, and Scopus. The keywords applied were “antiviral activity” and “essential oils”, “antiviral activity” and “volatile compounds”, and “essential oils” and “respiratory diseases”.\n\n3.2. Ligand Selection\nThe major components (\u003e5%) of essential oils and pure essential oil components that have been screened against human pathogenic viruses were selected. In the case where enantiomers are known to be natural products, both structures were selected. A total of 171 essential oil components were used in the virtual screening.\n\n3.3. Molecular Docking\nEach ligand structure was prepared using Spartan ’18 v. 1.4.4 (Wavefunction, Inc., Irvine, CA, USA). The lowest-energy conformations of the ligands were determined and used as starting structures in the molecular docking. This is particularly important to include all potential conformations in medium-sized rings where interconversion between conformations may be hindered (e.g., bicyclogermacrene, costunolide, curdione, germacrene D, germacrone, and α-humulene). A total of six protein targets of SARS-CoV-2 from the Protein Data Bank (PDB), represented by a total of 17 structures, were used in the molecular docking, including SARS-CoV-2 main protease (PDB: 5R7Z, 5R80, 5R81, 5R82, 5R83, 5R84, 6LU7, 6M03, and 6Y84), SARS-CoV-2 endoribonuclease (PDB: 6VWW), SARS-CoV-2 ADP ribose phosphatase (PDB: 6W01 and 6W02), SARS-CoV-2 RNA-dependent RNA polymerase (PDB: 6M71), SARS-CoV-2 spike protein binding domain (PDB: 6M0J, 6VX1, 6VW1, and 6M17), and the human angiotensin-converting enzyme (PDB: 6M0J, 6VX1, 6VW1, and 6M17). Molecular docking was carried out using Molegro Virtual Docker v. 6.0.1 (Aarhus, Denmark) as previously reported [128,129]. Briefly, a 15-Å radius sphere centered on the binding sites of each protein structure in order to permit each ligand to search. In the case of the spike protein and human ACE2, the docking sphere was located at the interface between the spike protein and ACE2. In one case, ACE2 was removed and docking was carried out with the spike protein, and in the other case, the spike protein was removed and docking was carried out with ACE2. Standard protonation states of each protein, based on neutral pH, were used, and charges were assigned based on standard templates as part of the Molegro Virtual Docker program. Each protein was used as a rigid model without protein relaxation. Flexible-ligand models were used in the docking optimizations. Different orientations of the ligands were searched and ranked based on their “rerank” energy scores. A minimum of 100 runs for each ligand was carried out. In analyzing the docking scores, we accounted for the recognized bias due to molecular weight [130,131,132] using the scheme: DSnorm = 7.2 × Edock/MW⅓, where DSnorm is the normalized docking score, Edock is the MolDock re-rank score, MW is the molecular weight, and 7.2 is a scaling constant to ensure the average DSnorm values are comparable to those of Edock [128]. The best docking results are summarized in Table 1.\n\n4. Conclusions\nA molecular docking analysis was carried out using 171 essential oil components with the SARS-CoV-2 main protease (SARS-CoV-2 Mpro), SARS-CoV-2 endoribonucleoase (SARS-CoV-2 Nsp15/NendoU), SARS-CoV-2 ADP-ribose-1″-phosphatase (SARS-CoV-2 ADRP), SARS-CoV-2 RNA-dependent RNA polymerase (SARS-CoV-2 RdRp), the binding domain of the SARS-CoV-2 spike protein (SARS-CoV-2 rS), and human angiotensin-converting enzyme (hACE2). The best docking ligands for the SARS-CoV target proteins were (E,E)-α-farnesene, (E)-β-farnesene, and (E,E)-farnesol. The docking energies were relatively weak, however, and are unlikely to interact with the virus targets. However, essential oil components may act synergistically, essential oils may potentiate other antiviral agents, or they may provide some relief of COVID-19 symptoms.\n\nAcknowledgments\nW.N.S. participated in this work as part of the activities of the Aromatic Plant Research Center 237 (APRC, https://aromaticplant.org/).\n\nAuthor Contributions\nConceptualization, J.K.R.d.S., K.G.B., and W.N.S.; methodology, J.K.R.d.S., K.G.B., and W.N.S.; formal analysis, W.N.S.; investigation, J.K.R.d.S., P.L.B.F., K.G.B., and W.N.S.; data curation, W.N.S.; writing—original draft preparation, J.K.R.d.S. and W.N.S.; writing—review and editing, J.K.R.d.S., P.L.B.F., K.G.B., and W.N.S.; project administration, W.N.S.; All authors have read and agreed to the published version of the manuscript.\n\nFunding\nThis research received no external funding.\n\nConflicts of Interest\nThe authors declare no conflict of interest. Abbreviations\nAdeno Adenovirus\nAIV Avian influenza virus\nBaNadD Bacillus anthracis nicotinate mononucleotide adenylytransferase\nBtOBP Bovine odorant binding protein\nCOVID-19 Coronavirus disease 2019\nCox B1 Coxsackie B1 virus\nDENV-1 Dengue virus serotype 1\nDENV-2 Dengue virus serotype 2\nDENV-3 Dengue virus serotype 3\nDENV-4 Dengue virus serotype 4\nDrPLA2 Russell’s viper phospholipase A2\nDSnorm Normalized docking score\nEcAspTA Esherichia coli L-aspartate aminotransferase\nECHO 9 Echovirus 9\nhACE2 Human angiotensin-converting enzyme\nHeLa Human cervical tumor cells\nHEp-2 Human epithelial type 2 cells\nHRSV Human respiratory syncytial virus\nHSV-1 Herpes simplex virus 1\nHSV-2 Herpes simplex virus 2\nIC50 Median inhibitory concentration\nJUNV Junin virus\nMDCK Madin-Darby canine kidney cells\nMTT 3-(4,5-dimethylthiazol-2-yl)-2,5-diphenyltetrazolium bromide\nPCR Polymerase chain reaction\nPDB Protein data bank\nPolio 1 Poliomyelitis virus 1\nRC-37 African green monkey kidney cells\nSARS-CoV-2 2019 severe acute respiratory syndrome coronavirus 2\nTcAChE Torpedo acetylcholinesterase\nVero African green monkey kidney cells\nYFV Yellow fever virus\n\nFigure 1 Lowest-energy docked poses of (E)-β-farnesene and (E,E)-α-farnesene with the SARS-CoV-2 main protease (PDB: 6LU7). (A) Ribbon structure of the enzyme and (E)-β-farnesene. (B) Solid structure of the enzyme showing (E)-β-farnesene in the binding cleft. (C) Amino acid residues in proximity to the docked (E)-β-farnesene. (D) Lowest-energy docked pose of (E,E)-α-farnesene in the enzyme binding site.\nFigure 2 Lowest-energy docked poses of (E,E)-farnesol and (E)-nerolidol with the SARS-CoV-2 main protease (PDB: 6Y84). (A) Ribbon structure of the enzyme and (E,E)-farnesol (magenta) and (E)-nerolidol (orange). (B) Solid structure of the enzyme showing (E,E)-farnesol (magenta) and (E)-nerolidol (orange) in the binding cleft. (C) Important interactions of amino acid residues with (E,E)-farnesol. (D) Important interactions of amino acid residues with (E)-nerolidol. Hydrogen bonds are indicated with blue dashed lines.\nFigure 3 Lowest-energy docked poses of (E,E)-α-farnesene, (E)-β-farnesene, (E,E)-farnesol, and (E)-nerolidol with SARS-CoV-2 endoribonuclease (PDB: 6VWW). (A) Ribbon structure of the enzyme and (E,E)-α-farnesene (green), (E)-β-farnesene (aqua), (E,E)-farnesol (magenta), and (E)-nerolidol (orange). (B) Solid structure of the enzyme showing (E,E)-α-farnesene (green), (E)-β-farnesene (aqua), (E,E)-farnesol (magenta), and (E)-nerolidol (orange) in the binding cleft. (C) Lowest-energy docked pose of (E,E)-α-farnesene in the binding site. (D) Lowest-energy docked pose of (E)-β-farnesene in the binding site. (E) Lowest-energy docked pose of (E,E)-farnesol in the binding site. (F) Lowest-energy docked pose of (E)-nerolidol in the binding site. Hydrogen bonds are indicated with blue dashed lines.\nFigure 4 Lowest-energy docked pose of (E,E)-farnesol with SARS-CoV-2 ADP ribose phosphatase (PDB: 6W02). (A) Ribbon structure of the enzyme and the docked ligand. (B) Solid structure of the enzyme showing (E,E)-farnesol in the binding cleft. (C) Amino acid residues in proximity to the docked (E,E)-farnesol (hydrogen bonds are indicated with blue dashed lines).\nFigure 5 Lowest-energy docked poses of β-sesquiphellandrene, α-zingiberene, phytol, and phytone with SARS-CoV-2 ADP ribose phosphatase (PDB: 6W02). (A) Ribbon structure of the enzyme with β-sesquiphellandrene (brown) and α-zingiberene (yellow). (B) Ribbon structure of the enzyme with phytol (green) and phytone (red).\nFigure 6 Lowest-energy docked ligands with the binding domain of SARS-CoV-2 spike protein and human angiotensin-converting enzyme 2 (ACE2) (PDB: 6M17).\nTable 1 Essential oils showing antiviral activity.\nEssential Oil Major Components Assay IC50 (μg/mL) Reference\nAloysia gratissima (Gillies \u0026 Hook.) Tronc. caryophyllene oxide (15.8%), guaiol (17.4%) a, chrysanthenyl acetate (5.6%), and limonene oxide (5.3%) Plaque reduction assay (Vero cells), HSV-1 65.0 [37]\nAloysia triphylla Royle α-thujone (22.9%), cis−carveol (17.5%), carvone (13.2%), and limonene (12.7%) Plaque reduction assay (Vero cells), HSV-1 \u003e250 [38]\nArtemisia arborescens L. camphor (35.7%), β-thujone (24.0%), and chamazulene (7.7%) Plaque reduction assay (Vero cells), HSV-1 25% inhibition at 100 μg/mL [39]\nArtemisia arborescens L. Artemisia arborescens L. β-thujone (45.0%), camphor (6.8%), and chamazulene (22.7%) c Plaque reduction assay (Vero cells), HSV-1, HSV-2 2.4, 4.1 [40]\nArtemisia douglasiana Besser α-thujone (68.3%) and β-thujone (7.5%) Plaque reduction assay (Vero cells), HSV-1 83 [37]\nArtemisia kermanensis Podlech (syn. Seriphidium kermanense (Podlech) K. Bremer \u0026 Humphries α-thujone (13.8%), camphor (10.2%), and β-thujone (6.2%) Plaque reduction assay (Vero cells), HSV-1 40 [41]\nArtemisia mendozana DC. camphor (22.4%), artemiseole (11.7%), artemisia alcohol (10.8%), and borneol (7.2%) Plaque reduction assay, DENV−2, JUNV and HSV-1 129.3, 178.6, and 153.7 [38]\nArtemisia princeps Pamp. borneol (12.1%), α-thujone (8.7%), τ−cadinol, (6.7%), and 1,8-cineole (6.2%) Plaque reduction assay, murine norovirus−1 64% inhibition at 0.01% [42]\nPlaque reduction assay, feline calicivirus−F9 48% inhibition at 0.1%\nArtemisia vulgaris L. α-thujone (38.1%), β-thujone (10.6%), and 1,8-cineole (8.8%) Virus yield assay (Vero cells), yellow fever virus (YFV) 100 μg/mL (100% inhibition) [43]\nAyapana triplinervis (Vahl) R.M. King \u0026 H. Rob. thymohydroquinone dimethyl ether Plaque reduction assay (A549 cells), Zika virus 38.0 [44]\nBuddleja cordobensis Griseb. caryophyllene oxide (32.1%), β-caryophyllene (16.5%), and α-copaene (8.5%) Plaque reduction assay, DENV−2, JUNV and HSV-1 86.4, 39.0, and 54.1 [38]\nCedrus libani A. Rich. himachalol (22.5%), β-himachalene (21.9%), and α-himachalene (10.5%) Cytopathic effect (CPE) on Vero cells, HSV-1 440 [45]\nCinnamomum zeylanicum Blume (syn. Cinnamomum verum J. Presl) eugenol (75–85%), linalool (1.6−8.5%), (E)−cinnamaldehyde (0.6−1.5%), (E)−cinnamyl acetate (0.7–2.6%), β-caryophyllene (0.5–6.7%), eugenyl acetate (0.1–2.9%), and benzyl benzoate (0.1–8.3%) Influenza type A (H1N1) [46]\nCinnamomum zeylanicum Blume (syn. Cinnamomum verum J. Presl) (E)−cinnamaldehyde (63.9%), eugenol (7.0%), and (E)−cinnamyl acetate (5.1%) c Plaque reduction assay (HeLa cells), HSV-2 82 [47]\nCitrus × bergamia Risso \u0026 Poit. limonene (23–55%), linalool (2–37%), linalyl acetate (12–41%), β-pinene (up to 10%), and γ-terpinene (up to 10%) Influenza virus type A H1N1 100% inhibition at 0.3% [46]\nCitrus limonum Risso limonene (54.6%), γ-terpinene (19.1%), and β-pinene (14.5%) d Plaque reduction assay (Vero cells), HSV-1 2500 [48]\nCitrus reshni Hort ex Tan. (leaf EO) sabinene (40.5%), linalool (23.3%), and terpinen-4-ol (8.3%) Plaque reduction assay, influenza A virus H5N1 19.4% inhibition at 0.1 μL/mL [36]\nCitrus reshni Hort ex Tan. (unripe fruit peel EO) limonene (82.4%) and linalool (7.2%) Plaque reduction assay, influenza A virus H5N1 61.5% inhibition at 1.5 μL/mL [36]\nCitrus reshni Hort ex Tan. (ripe fruit peel EO) limonene (91.6%) Plaque reduction assay, influenza A virus H5N1 50% inhibition at 1.5 μL/mL [36]\nCupressus sempervirens L. α-pinene (51.9%) and δ-3-carene (24.9%) c Plaque reduction assay (Vero cells), HSV-1 6600 [48]\nCymbopogon citratus (DC.) Stapf geranial (40.2%), neral (30.6%), and geraniol (6.7%) c Plaque reduction assay (Vero cells), HSV-1 91 [48]\nCymbopogon flexuosus (Nees) Will. Watson geranial (48–54%) and neral (29–33%) Influenza virus type A (H1N1) [46]\nCynanchum stauntonii (Decne.) Schltr. ex H. Lév. (2E,4E)-decadienal (23.0%), γ-nonalactone (4.2%), 5-pentyl-2(3H)−furanone (3.8%), and 3-isopropyl-1-pentanol (3.5%) Influenza type A (H1N1) 64 [46]\nDysphania ambrosioides (L.) Mosyakin \u0026 Clemants cis-ascaridole (60.7%) and m-cymene (22.2%) Plaque reduction assay, Coxsackie virus B4 21.75 [49]\nEucalyptus astringens (Maiden) Maiden 1,8-cineole (42.0%), α-pinene (22.0%), and trans−pinocarveol (7.0%) Vero cells, Coxsakie virus B3 13.0 [50]\nEucalyptus bicostata Maiden, Blakely \u0026 Simmonds 1,8-cineole (68.0%), globulol (5.4%), and trans−pinocarveol (4.6%) Vero cells, Coxsakie virus B3 13.6 [50]\nEucalyptus caesia Benth. 1,8-cineole (40.2%), p-cymene (14.1%), γ-terpinene (12.4%), α-pinene (7.7%), and terpinen-4-ol (5.6%) Plaque reduction assay (Vero cells), HSV-1 70 [41]\nEucalyptus camaldulensis Dehnh. α-terpinene (26.3%), α-terpineol (9.1%), and camphene (8.5%) e Plaque reduction assay, Rotavirus Wa strain 50% inhibition at 10% EO concentration [51]\nEucalyptus camaldulensis Dehnh. α-terpinene (26.3%), α-terpineol (9.1%), and camphene (8.5%) e Plaque reduction assay, Coxsackie virus B4 53.3% at 10% EO concentration [51]\nEucalyptus camaldulensis Dehnh. α-terpinene (26.3%), α-terpineol (9.1%), and camphene (8.5%) e Plaque reduction assay, HSV-1 90% at 10% EO concentration [51]\nEucalyptus camaldulensis Dehnh. α-terpinene (26.3%), α-terpineol (9.1%), and camphene (8.5%) e Plaque reduction assay, adenovirus type 7 0% at 10% EO concentration [51]\nEucalyptus cinereal F. Muell. ex Benth. 1,8-cineole (70.4%), α-pinene (4.5%), and limonene (3.7%) Vero cells, Coxsakie virus B3 13.0 [50]\nEucalyptus globulus Labill. 1,8-cineole (63.8%) and α-pinene (14.0%) f Plaque reduction assay (Vero cells), HSV-1 1700 [48]\nEucalyptus globulus Labill. 1,8-cineole (63.8%) and α-pinene (14.0%) f Plaque reduction assay (RC-37 cells), HSV-1 55.0 [52]\nEucalyptus lehmannii (Schauer) Benth. 1,8-cineole (59.6%), α-pinene (17.6%), and α-terpineol (8.7%) Vero cells, Coxsakie virus B3 11.5 [50]\nEucalyptus leucoxylon F. Muell. 1,8-cineole (59.2%), α-pinene (7.8%), and α-terpineol (4.3%) Vero cells, Coxsakie virus B3 8.1 [50]\nEucalyptus maidenii F. Muell. 1,8-cineole (57.8%), p-cymene (7.4%), and α-pinene (7.3%) Vero cells, Coxsakie virus B3 14.5 [50]\nEucalyptus odorata Behr cryptone (20.9%), p-cymene (16.7%), phellandral (6.6%), and cuminal (6.6%) Vero cells, Coxsakie virus B3 19.2 [50]\nEucalyptus sideroxylon A. Cunn. ex Woolls 1,8-cineole (69.2%), α-pinene (6.9%), and α-terpineol (5.4%) Vero cells, Coxsakie virus B3 12.3 [50]\nEupatorium patens D. Don ex Hook. \u0026 Arn. germacrene D (36.2%), β-caryophyllene (14.1%), and bicyclogermacrene (7.0%) Plaque reduction assay (Vero cells), HSV-1 125 [37]\nFortunella margarita (Lour.) Swingle (leaf EO) α-terpineol (55.5%), carvone (5.7%), carveol (5.5%), γ-muurolene (5.5%), and citronellal (5.0%) MTT assay, reasserted avian influenza A virus, H5N1 6.77 [53]\nFortunella margarita (Lour.) Swingle (fruit EO) β-eudesmol (28.3%), α-muurolene (10.3%), β-gurjunene (10.0%), γ-eudesmol (8.4%), and γ-muurolene (6.6%) MTT assay, reasserted avian influenza A virus, H5N1 38.89 [53]\nGaillardia megapotamica (Spreng.) Baker β-pinene (24.2%), (Z)-β-ocimene (16.5%), α-pinene (7.7%), limonene (7.5%), and β-caryophyllene (6.7%) Plaque reduction assay, DENV−2, JUNV and HSV-1 140.6, 49.8, and 99.1 [38]\nHeterothalamus alienus (Spreng.) Kuntze β-pinene (35.5%), spathulenol (10.7%), and germacrene D (6.8%) Plaque reduction assay DENV−2, JUNV and HSV-1 122.3, 44.2 and 148.4 [38]\nHeterotheca latifolia Buckley borneol (40.0%), camphor (24.3%), and limonene (5.1%) Plaque reduction assay (Vero cells), HSV-1 \u003e150 [37]\nHouttuynia cordata Thunb. decanal (3.4−8.9%), decanol (up to 7.0%), 2−undecanone (23.0−36.1%), decanoic acid (1.4−6.3%), dodecanal (up to 7.3%), and 2−tridecanone (2.6−5.6%) Influenza type A (H1N1) 48 [54]\nHyptis mutabilis (Rich.) Briq. fenchone (17.1%), 1,8-cineole (12.6%), β-caryophyllene (10.9%), bicyclogermacrene (8.7%), and germacrene D (6.2%) Plaque reduction assay (Vero cells), HSV-2 (Human Herpesvirus type 1) 79.01 [55]\nHyptis mutabilis (Rich.) Briq. germacrene D (15.1%), β-caryophyllene (13.3%), curzerene (13.3%), and bicyclogermacrene (13.2%) Plaque reduction assay (Vero cells) \u003e150 [37]\nHyssopus officinalis L. cis−pinocamphone (40.1%), trans−pinocamphone (13.3%), β-pinene (10.7%), and β-phellandrene (5.3%) c Plaque reduction assay (RC-37 cells), HSV-1 1 [56]\nHyssopus officinalis L. cis−pinocamphone (40.1%), trans−pinocamphone (13.3%), β-pinene (10.7%), and β-phellandrene (5.3%) c Plaque reduction assay (RC-37 cells), HSV-2 6 [57]\nIllicium verum Hook. f. (E)−anethole (90.5%) c Plaque reduction assay (RC-37 cells), HSV-1 40 [58]\nIllicium verum Hook. f. (E)−anethole (90.5%) c Plaque reduction assay (RC-37 cells), HSV-1 1 [59]\nIllicium verum Hook. f. (E)−anethole (90.5%) c Plaque reduction assay (RC-37 cells), HSV-2 30 [57]\nJungia polita Griseb. caryophyllene oxide (9.2%) and β-caryophyllene (8.1%) Plaque reduction assay DENV−2, JUNV and HSV-1 39.8, 134.2 and 136.4 [38]\nJuniperus communis L. α-pinene (46.7%), myrcene (15.0%), sabinene (13.2%), and limonene (7.0%) c Plaque reduction assay (Vero cells), HSV-1 \u003e10000 [48]\nLavandula angustifolia Mill. linalyl acetate (37.0−43.6%), linalool (19.7−39.1%), geraniol (up to 9.3%), β-caryophyllene (up to 5.1%), terpinene−4−ol (up to 14.9%), lavandulol (up to 1.5%), lavandulyl acetate (up to 5.5%), 1,8-cineole (up to 4.1%), and borneol (up to 6.4%) 85% in vitro inhibition of influenza type A (H1N1) [46]\nLavandula latifolia Medik. linalool (31.9%), 1,8-cineole (18.8%), and borneol (10.1%) g Plaque reduction assay (Vero cells), HSV-1 2200 [48]\nLepechinia salviifolia (Kunth) Epling camphor (10.3%), limonene (9.7%), p−mentha−1(7),8−diene (7.4%), α-pinene (6.9%), and γ-terpinene (6.7%) Plaque reduction assay (Vero cells), HSV-1, HSV-2 68.8, 81.9 [55]\nLepechinia vulcanicola J.R.I. Wood limonene (18.9%), germacrene D (10.4%), 1−octen−3−ol (8.8%), β-caryophyllene (8.7%), and α-pinene (8.2%) Plaque reduction assay (Vero cells), HSV-1, HSV-2 112, 68.9 [55]\nLeptospermum scoparium J.R. Forst. \u0026 G. Forst. calamene (16.0%), leptospermone (14.5%), δ−cadinene (6.1%), flavesone (4.5%), viridiflorene (4.4%), and isoleptospermone (3.9%) Plaque reduction assay (RC-37 cells), HSV-1, HSV-2 0.96, 0.58 [60]\nLippia alba (Mill.) N.E. Br. ex Britton \u0026 P. Wilson carvone (51.0%), Limonene (33%), and bicyclosesquiphellandrene (7.0%) Virus yield assay (Vero cells), yellow fever virus (YFV) 100 μg/mL (100% inhibition) [43]\nLippia alba (Mill.) N.E. Br. ex Britton \u0026 P. Wilson carvone (39.7%), limonene (30.6%), and bicyclosesquiphellandrene (8.9%) Plaque reduction assay (Vero cells), DENV−1, DENV−2, DENV−3, DENV−4, YFV 17 DD 10.1, 0.4, 32.6, 21.1, 4.9 [61]\nLippia alba (Mill.) N.E. Br. ex Britton \u0026 P. Wilson carvone (39.7%), limonene (30.6%), and bicyclosesquiphellandrene (8.9%) Plaque reduction assay (Vero cells), Yellow fever (YFV) 4.3 [62]\nLippia citriodora Kunth (syn. Aloysia citriodora Palau) geranial (18.9%), neral (15.6%), limonene (10.7%), and 1,8-cineole (5.0) Plaque reduction assay (Vero cells), DENV−1, DENV−2, DENV−3, DENV−4, YFV 17 DD 1.9, 2.9, 2.6, 33.7, 5.7 [61]\nLippia citriodora Kunth (syn. Aloysia citriodora Palau) geranial (18.9%), neral (15.6%), limonene (10.7%), and 1,8-cineole (5.0) Plaque reduction assay (Vero cells), Yellow fever (YFV) 19.4 [62]\nLippia graveolens Kunth carvacrol (56.8%), o−cymene (32.1%), and γ-terpinene (3.7%) h MTT assay (Mardin−Darby bovine kidney cells), HSV-1, ACVR−HSV-1 (acyclovir−resistant HSV-1), HRSV (human respiratory syncytial virus) 99.6, 55.9, 68.0 [63]\nLippia junelliana (Moldenke) Tronc. piperitenone oxide (= rotundifolone) (36.5%), limonene (23.1%), camphor (7.9%), and spathulenol (6.5%) Plaque reduction assay (Vero cells), HSV-1 \u003e150 [37]\nLippia origanoides carvacrol (44.0%), thymol (15.0%), and γ-terpinene (10.0%) Virus yield assay (Vero cells), yellow fever virus (YFV) 11.1 μg/mL (100% inhibition) [43]\nLippia turbinata Griseb. limonene (60.6%), piperitenone oxide (17.4%), and β-caryophyllene (6.4%) Plaque reduction assay (Vero cells), HSV-1 \u003e 150 [37]\nMatricaria recutita L. α-bisabolol oxide A (13.4–55.9%), α-bisabolol oxide B (8.4–25.1%), bisabolone oxide A (2.9–11.4%), cis−bicycloether (= (Z)−spiroether) (3.6–17.7%), and (E)-β-farnesene (1.9–10.4%) i Plaque reduction assay (RC-37 cells), HSV-1 0.3 [58]\nMatricaria recutita L. α-bisabolol oxide A (13.4–55.9%), α-bisabolol oxide B (8.4–25.1%), bisabolone oxide A (2.9−11.4%), cis−bicycloether (= (Z)−spiroether) (3.6–17.7%), and (E)-β-farnesene (1.9–10.4%) i Plaque reduction assay (RC-37 cells), HSV-2 1.5 [57]\nMelaleuca alternifolia Cheel terpinen-4-ol (36.71%), γ-terpinene (22.20%), and α-terpinene (10.10%) Plaque reduction assay, influenza A⁄PR ⁄ 8 virus subtype H1N1 60 [31]\nMelaleuca alternifolia Cheel terpinen-4-ol (30–48%), γ-terpinene (10–28%), α-terpinene (5–13%), 1,8-cineole (up to 15%), terpinolene (1.5−5%), p-cymene (0.5–12%), α-pinene (1–6%), and α-terpineol (1.5–8%) 100% inhibition of influenza type A (H1N1) virus at 0.01%; type A (H11N9) virus to tea tree oil vapor caused 100% inhibition [46]\nMelaleuca alternifolia Cheel terpinen-4-ol (47.5%), γ-terpinene (20.2%), and α-terpinene (8.6%) c Plaque reduction assay (Vero cells), HSV-1 2700 [48]\nMelaleuca alternifolia Cheel terpinen-4-ol (47.5%), γ-terpinene (20.2%), and α-terpinene (8.6%) c Plaque reduction assay (Vero cells), HSV-1 13.2 [64]\nMelaleuca alternifolia Cheel terpinen-4-ol (47.5%), γ-terpinene (20.2%), and α-terpinene (8.6%) c Plaque reduction assay (RC-37 cells), HSV-1 2 [52]\nMelaleuca alternifolia Cheel terpinen-4-ol (47.5%), γ-terpinene (20.2%), and α-terpinene (8.6%) c Plaque reduction assay (HeLa cells), HSV-2 2700 [47]\nMelaleuca alternifolia Cheel terpinen-4-ol (47.5%), γ-terpinene (20.2%), and α-terpinene (8.6%) c Plaque reduction assay (Vero cells), HSV-1 significant plaque reduction at 10 and 5% v/v [65]\nMelaleuca armillaris (Sol. ex Gaertn.) Sm. 1,8-cineole (33.9%), terpinen-4-ol (18.8%), and γ-terpinene (10.4%) Plaque reduction assay (Vero cells), HSV-1 99% plaque reduction (concentration not given) [66]\nMelaleuca ericifolia Sm. methyl eugenol (96.84%) Plaque reduction assay (Vero cells), HSV-1 91.5% plaque reduction (concentration not given) [66]\nMelaleuca leucadendra (L.) L. 1,8-cineole (64.3%), α-terpineol (11.0%), and valencene (3.91%) Plaque reduction assay (Vero cells), HSV-1 92% plaque reduction (concentration not given) [66]\nMelissa officinalis L. neral (17−32%), geranial (23–43%), linalool (up to 9.0%), citronellal (0.7–20.3%), geraniol (up to 23.2%), β-caryophyllene (up to 11.3%), and caryophyllene oxide (0.4−31.7%) influenza A virus (H9N2) Significant reduction at 5 μg/mL [46]\nMelissa officinalis L. β-cubebene (15.4%), β-caryophyllene (14.2%), α-cadinol (7.2%), geranial (6.6%), and neral (5.8%) Plaque reduction assay (HEp−2 cells), HSV-2 21 [67]\nMelissa officinalis L. geranial (20.1%), β-caryophyllene (17.3%), and neral (13.6%) Plaque reduction assay (RC-37 cells), HSV-1, HSV-2 4, 0.8 [68]\nMentha × piperita L. menthol (42.8%), menthone (14.6%), and isomenthone (5.9%) Plaque reduction assay (RC-37 cells), HSV-1, HSV-2 20, 8 [69]\nMentha × piperita L. menthol (43.8%), menthone (19.7%), menthyl acetate (6.5%), and 1,8-cineole (5.0%) c Plaque reduction assay (Vero cells), HSV-1 2200 [48]\nMentha suaveolens Ehrh. limonene (7.4%), isopulegol (12.0%), and piperitenone oxide (41.8%) Plaque reduction assay, cytopathogenic murine norovirus 0.87 [70]\nMentha suaveolens Ehrh. piperitenone oxide (86.9%) Plaque reduction assay (Vero cells), HSV-1 5.1 [64]\nMinthostachys mollis Griseb. cis−piperitone epoxide (29.9%), piperitenone oxide (25.6%), menthone (7.4%), germacrene D (5.8%), and pulegone (5.5%) Plaque reduction assay (Vero cells), HSV-1, HSV-2 70.7, 68.0 [55]\nOcimum basilicum var. album (L.) Benth. linalool (53.8%) and eugenol (12.6%) j Plaque reduction assay (Vero cells), HSV-1 \u003e10000 [48]\nOcimum campechianum Mill. methyl eugenol (53.9%), β-caryophyllene (13.0%), α-bulnesene (5.4%), germacrene D (3.4%), and α-humulene (3.3%) Plaque reduction assay (Vero cells), HSV-2 74.33 [55]\nOriganum elongatum Emb. (leaf EO) p-cymene (16.2%), γ-terpinene (13.5%), thymol (14.2%), and carvacrol (19.2%) Plaque reduction assay, cytopathogenic murine norovirus 0.37 [70]\nOriganum elongatum Emb. (inflorescence EO) p-cymene (16.1%), γ-terpinene (7.3%), and carvacrol (40.1%), Plaque reduction assay, cytopathogenic murine norovirus 0.75 [70]\nOriganum majorana L. terpinen-4-ol (28.9%), γ-terpinene (14.9%), trans−sabinene hydrate (9.5%), α-terpinene (8.7%), and sabinene (7.2%) c Plaque reduction assay (Vero cells), HSV-1 2800 [48]\nOriganum majorana L. terpinen-4-ol (28.9%), γ-terpinene (14.9%), trans−sabinene hydrate (9.5%), α-terpinene (8.7%), and sabinene (7.2%) c Plaque reduction assay (HeLa cells), HSV-2 520 [47]\nOriganum vulgare L. trans−sabinene hydrate (21.0%), thymol (11.0%), and carvacrol methyl ether (11.0%) Virus yield assay (Vero cells), yellow fever virus (YFV) 100 μg/mL (100% inhibition) [43]\nOsmunda regalis L. hexahydrofarnesyl acetone ( = phytone) (11.8%), 2,4−di−t−butylphenol (6.8%), phytol (6.5%), hexadecene (4.1%), and octadecene (4.4%) Plaque reduction assay, Coxsackie virus B4 type 2 2.24 [71]\nPectis odorata Griseb. limonene (50.2%), neral (27.2%), and geranial (23.6%) Plaque reduction assay DENV−2, JUNV and HSV-1 39.6, 36.6, and 71.5 [38]\nPelargonium graveolens L’Hér. ex Aiton citronellol (21.9–37.5%), citronellyl formate (9.8–20.6%), geraniol (6.0–16.5%), geranyl formate (1.5–6.5%), menthone (up to 13%), isomenthone (up to 9.9%), and linalool (0.8−14.9%) influenza type A (H1N1) 95% inhibition at 0.3% [46]\nPinus mugo Turra δ-3-carene (23.9%), α-pinene (17.9%), β-pinene (7.8%), and β-phellandrene (7.2%) k Plaque reduction assay (RC-37 cells), HSV-1 7 [58]\nRavensara aromatica Sonn. (syn. Cryptocarya agathophylla van der Werff) 1,8-cineole (52.6%), α-terpineol (12.4%), and sabinene (11.0%) l Plaque reduction assay (Vero cells), HSV-1 2800 [48]\nRosmarinus officinalis L. α-pinene (23.9%), verbenone (15.4%), camphor (11.0%), camphene (8.7%), p-cymene (7.5%), and 3−octanone (5.6%) Plaque reduction assay (Vero cells), HSV-1 60 [41]\nRosmarinus officinalis L. 1,8-cineole (45.9%), α-pinene (12.0%), camphor (10.9%), and β-pinene (6.3%) b Plaque reduction assay (Vero cells), HSV-1 2700 [48]\nSalvia fruticosa Mill. 1,8-cineole (47.5%), camphor (9.0%), β-thujone (7.6%), and α-thujone (4.3%) Plaque reduction assay (Vero cells), HSV-1 and HSV-2 1300 [72]\nSantalum album L. (Z)−α-santalol (45.2%), (Z)-β-santalol (25.4%), and (Z)−trans−α-bergamotol (7.8%) c Plaque reduction assay (Vero cells), HSV-1, HSV-2 22.7, 45.3 [73]\nSantalum album L. (Z)−α-santalol (45.2%), (Z)-β-santalol (25.4%), and (Z)−trans−α-bergamotol (7.8%) c Plaque reduction assay (RC-37 cells), HSV-1 2 [56]\nSantalum album L. (Z)−α-santalol (45.2%), (Z)-β-santalol (25.4%), and (Z)−trans−α-bergamotol (7.8%) c Plaque reduction assay (RC-37 cells), HSV-2 5 [57]\nSantolina insularis (Gennari ex Fiori) Arrigoni artemisia ketone (21.2%), allo−aromadendrene (12.7%), 1,8-cineole (9.0%), and camphene (8.5%) m Plaque reduction assay (Vero cells), HSV-1 and HSV-2 0.88, 0.7 [74]\nSatureja hortensis L. carvacrol (32.4%), γ-terpinene (32.0%), thymol (10.0%), and p-cymene (6.6%) Plaque reduction assay (Vero cells), HSV-1 80 [41]\nTessaria absinthioides (Hook. \u0026 Arn.) DC. caryophyllene oxide (12.2%), (E)-β-damascenone, γ-eudesmol (8.5%), α-gurjunene (5.8%), and terpinen-4-ol (5.4%) Plaque reduction assay (Vero cells), HSV-1 105 [37]\nThymus capitatus (L.) Hoffmanns. \u0026 Link (unripe fruit EO) carvacrol (68.6%), p-cymene (4.8%), γ-terpinene (3.0%), and β-caryophyllene (2.9%) Plaque reduction assay, cytopathogenic murine norovirus 0.49 [70]\nThymus capitatus (L.) Hoffmanns. \u0026 Link (ripe fruit EO) carvacrol (58.8%), p-cymene (5.6%), γ-terpinene (2.8%), and β-caryophyllene (2.6%) Plaque reduction assay, cytopathogenic murine norovirus 0.50 [70]\nThymus vulgaris L. thymol (31–50%), p-cymene (0.1–26.6%), and γ-terpinene (up to 22.8%) 100% inhibition of type A (H1N1) virus at 0.3% concentration [46]\nThymus vulgaris L. thymol (43.9%), carvacrol (14.4%), p-cymene (10.5%), β-caryophyllene (7.0%), and γ-terpinene (5.1%) c Plaque reduction assay (RC-37 cells), HSV-1 10 [56]\nThymus vulgaris L. thymol (43.9%), carvacrol (14.4%), p-cymene (10.5%), β-caryophyllene (7.0%), and γ-terpinene (5.1%) c Plaque reduction assay (RC-37 cells), HSV-1 11 [52]\nThymus vulgaris L. thymol (43.9%), carvacrol (14.4%), p-cymene (10.5%), β-caryophyllene (7.0%), and γ-terpinene (5.1%) c Plaque reduction assay (RC-37 cells), HSV-2 7 [57]\nThymus willdenowii Boiss. 1,8-cineole (34.62%), camphor (18.55%), α-pinene (9.46%), and camphene (5.38%) Plaque reduction assay, Coxsackie virus Inactive [75]\nTrachyspermum ammi (L.) Sprague thymol (35–60%), α-pinene, p-cymene, and limonene Plaque reduction assay, Japanese encephalitis virus 80% reduction at 500 μg/mL [76]\nZataria multiflora Boiss. thymol (47.3%), carvacrol (21.9%), p-cymene (8.6%), γ-terpinene (4.2%), and β-caryophyllene (3.0%) Real time PCR (H9N2 subtype of AIV) Reduced viral replication in trachea of broiler chickens [77]\nZataria multiflora Boiss. thymol (33.1%), carvacrol (25.9%), and p-cymene (11.3%) Plaque reduction assay (Vero cells), HSV-1 30 [41]\nZingiber officinale Roscoe α-zingiberene (32.1%), ar−curcumene (15.2%), β-sesquiphellandrene (10.9%), α-farnesene (7.2%), and α-phellandrene (4.4%) Plaque reduction assay, Caprine alphaherpesvirus type I not determined [78]\nZingiber officinale Roscoe α-zingiberene (26.4%), camphene (12.6%), β-sesquiphellandrene (9.2%), ar−curcumene (6.5%), β-phellandrene (6.2%), and β-bisabolene (5.1%) c Plaque reduction assay (RC-37 cells), HSV-1 2 [56]\nZingiber officinale Roscoe α-zingiberene (26.4%), camphene (12.6%), β-sesquiphellandrene (9.2%), ar−curcumene (6.5%), β-phellandrene (6.2%), and β-bisabolene (5.1%) c Plaque reduction assay (RC-37 cells), HSV-2 1 [57]\na Reported as cadinol, but see [79,80]. b Essential oil composition not reported; essential oil composition obtained from [81]. c Essential oil composition not reported; essential oil composition of commercial (dōTERRA International, Pleasant Grove, Utah, USA). d Essential oil composition not reported; essential oil composition obtained from [82]. e Essential oil composition not reported; essential oil composition obtained from [83]. f Essential oil composition not reported; essential oil composition obtained from [84]. g Essential oil composition not reported; essential oil composition obtained from [85]. h Essential oil composition not reported; essential oil composition obtained from [86]. i Essential oil composition not reported; essential oil composition obtained from [87]. j Essential oil composition not reported; essential oil composition obtained from [88]. k Essential oil composition not reported; essential oil composition obtained from [89]. l Essential oil composition not reported; essential oil composition obtained from [90]. m Essential oil composition not reported; essential oil composition obtained from [91].\nTable 2 Antiviral activities of essential oil components.\nEssential Oil Component Assay IC50 (μg/mL) Reference\n(E)−Anethole Plaque reduction assay (RC-37 cells), HSV-1 20 [59]\nCamphor Plaque reduction assay (Vero cells), HSV-1 2600 [72]\nCarvacrol MTT assay (Mardin−Darby bovine kidney (MDBK) cells, HSV-1 48.6 [63]\nβ-Caryophyllene Plaque reduction assay (RC-37 cells), HSV-1 0.25 [59]\nCaryophyllene oxide Plaque reduction assay (RC-37 cells), HSV-1 0.7 [59]\n1,8-Cineole Plaque reduction assay (Vero cells), HSV-1 1800 [72]\n1,8-Cineole Plaque reduction assay (RC-37 cells), HSV-1 1200 [52]\n(E)-Cinnamaldehyde Influenza type A (H1N1) virus 70% at a concentration of 0.53% after 3 h [95]\n(E)-Cinnamaldehyde H1N1 in-vivo by inhalation in a mouse model 89% inhibition [95]\nCitral (Geranial + Neral) Yellow fever (YFV), Vero cells 17.6 [62]\nCitral (Geranial + Neral) Plaque reduction assay (RC-37 cells), HSV-1 3.50 [52]\np-Cymene Influenza, HSV-1, HSV-2, ECHO 9, Cox B1, Polio 1, Adeno 6 \u003e500 [31]\np-Cymene Plaque reduction assay (RC-37 cells), HSV-1 16 [52]\np-Cymene Influenza type A (H1N1) virus Inactive [25]\nDodecanal Influenza type A (H1N1) virus 51 [54]\nβ-Eudesmol Plaque reduction assay (Vero cells), HSV-1 6 [59]\nEugenol Plaque reduction assay (RC-37 cells), HSV-1 35 [59]\nEugenol Plaque reduction assay (RC-37 cells), HSV-1 25.6 [96]\nFarnesol Plaque reduction assay (RC-37 cells), HSV-1 3.5 [59]\nGermacrone Influenza type A (H1N1) virus 1.22–1.55 [97]\nGermacrone Influenza type A (H3N2) virus 0.34 [97]\nGermacrone Influenza type B virus 1.38 [97]\nIsoborneol Plaque reduction assay (Vero cells), HSV-1 \u003c1000 [98]\nNerolidol (natural) Plaque reduction assay (RC-37 cells), HSV-1 4.2 [99]\nNerolidol (synthetic) Plaque reduction assay (RC-37 cells), HSV-1 1.5 [99]\nOctanal Influenza type A (H1N1) virus 15 [54]\nPatchouli alcohol Influenza type A (H1N1) 89% inhibition at 10 μg/mL [100]\nPatchouli alcohol Influenza type A (H2N2) 0.89 [101]\nPatchouli alcohol Influenza type A (H2N2), in-vivo test using a mouse model 70% survival rate at a dose of 5 mg/(kg day) [101]\nα-Pinene Plaque reduction assay (RC-37 cells), HSV-1 4.5 [52]\nPiperitenone oxide Plaque reduction assay (Vero cells) 1.4 [64]\nα-Terpinene Influenza type A (H1N1) virus Inactive [25]\nα-Terpinene Influenza, HSV-1, HSV-2, ECHO 9, Cox B1, Polio 1, Adeno 4 \u003e12 [31]\nα-Terpinene Plaque reduction assay (RC-37 cells), HSV-1 8.5 [52]\nγ-Terpinene Plaque reduction assay (RC-37 cells), HSV-1 7 [52]\nγ-Terpinene Influenza, HSV-1, HSV-2, ECHO 9, Cox B1, Polio 1, Adeno 5 \u003e120 [31]\nγ-Terpinene influenza type A (H1N1) virus inactive [25]\nTerpinen-4-ol Influenza, HSV-1, HSV-2, ECHO 9, Cox B1, Polio 1, Adeno 2 25 (influenza)\u003e50 (others) [31]\nTerpinen-4-ol Plaque reduction assay (Vero cells), HSV-1 60 [52]\nα-Terpineol Plaque reduction assay (RC-37 cells), HSV-1 22 [52]\nTerpinolene Influenza, HSV-1, HSV-2, ECHO 9, Cox B1, Polio 1, Adeno 3 12 (influenza)\u003e12 (others) [31]\nThujones (α \u0026 β) Plaque reduction assay (RC-37 cells), HSV-1 400 [72]\nThymol Influenza type A (H1N1) virus Active [25]\nThymol Plaque reduction assay (RC-37 cells), HSV-1 30 [52]\n2-Undecanone influenza type A (H1N1) virus 62 [54]\nTable 3 Docking scores, normalized for molecular weight (DSnorm, kJ/mol), of essential oil components with severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) molecular targets.\nCompound MainProtease Endoribo-Nuclease ADP RibosePhosphatase RNA-DependentRNA Polymerase Spike ProteinBinding Domain Angiotensin-Converting Enzyme a\n(E)-Anethole −84.9 −83.0 −97.5 −74.0 −65.2 −83.8\nallo-Aromadendrene −86.6 −86.9 −95.8 −74.9 −66.1 −85.3\nArtemiseole −89.2 −83.4 −96.6 −73.0 −67.8 −78.0\n(R)-Artemisia alcohol −84.3 −78.3 −88.2 −66.8 −61.1 −74.7\n(S)-Artemisia alcohol −86.1 −85.4 −98.5 −69.5 −67.1 −77.4\nArtemisia ketone −91.0 −85.7 −97.9 −71.9 −66.9 −77.3\nAscaridole −74.8 −68.2 −86.0 −65.2 −62.6 −64.4\nBenzyl benzoate −104.9 −96.5 −110.3 −82.5 −74.9 −96.4\n(Z)-trans-α-Bergamotol −98.0 −91.2 −105.9 −71.9 −63.6 −83.6\nBicyclogermacrene −85.9 −88.0 −92.5 −75.6 −68.2 −86.1\nBicyclosesquiphellandrene −79.4 −89.6 −86.0 −61.8 −62.5 −78.2\nα-Bisabolol oxide A −88.5 −87.6 −89.1 −71.5 −63.5 −89.7\nα-Bisabolol oxide B −96.6 −92.2 −101.0 −79.7 −75.2 −95.6\nBisabolone oxide A −93.7 −87.9 −98.2 −73.3 −71.0 −78.7\n(+)-Borneol −77.4 −91.8 −100.1 −74.1 −70.9 −73.3\n(−)-Borneol −71.4 −71.5 −78.4 −56.7 −50.1 −73.7\n(+)-iso-Borneol −75.6 −75.3 −75.9 −60.8 −53.2 −71.8\n(−)-iso-Borneol −73.8 −69.2 −75.6 −54.8 −49.3 −72.4\nα-Bulnesene −95.2 −72.4 −78.4 −57.0 −57.8 −101.7\nδ-Cadinene −91.6 −90.2 −112.6 −75.2 −60.0 −93.4\nτ-Cadinol −92.3 −82.8 −82.5 −69.9 −69.8 −87.8\n(R)-Calamene −92.3 −83.5 −97.4 −69.0 −65.6 −87.3\n(S)-Calamene −88.4 −86.8 −95.9 −70.2 −64.7 −87.5\n(+)-Camphene −85.6 −78.9 −83.2 −64.4 −57.9 −72.2\n(−)-Camphene −77.2 −74.1 −87.1 −66.0 −59.8 −67.1\n(+)-Camphor −75.2 −73.1 −77.9 −63.9 −53.8 −69.4\n(−)-Camphor −72.5 −70.0 −75.6 −64.3 −52.8 −70.8\n(+)-δ-3-Carene −87.9 −78.6 −87.0 −65.0 −72.4 −75.8\n(−)-δ-3-Carene −83.9 −88.0 −90.4 −66.8 −67.3 −73.4\nCarvacrol −84.5 −86.6 −94.8 −74.1 −71.0 −81.2\nCarvacrol methyl ether −85.5 −82.5 −103.1 −74.6 −65.8 −83.7\n(+)-cis−Carveol −87.0 −81.8 −97.7 −76.5 −69.7 −80.4\n(−)-cis−Carveol −85.6 −85.0 −95.6 −76.8 −74.3 −81.2\n(R)-Carvone −87.7 −82.4 −98.2 −74.7 −69.2 −83.4\n(S)-Carvone −86.2 −83.2 −98.9 −73.2 −66.3 −82.2\n(E)-Caryophyllene −81.2 −82.2 −93.9 −73.4 −59.2 −75.1\nCaryophyllene oxide −80.6 −86.7 −97.0 −74.1 −66.5 −83.3\nCedrol −82.3 −84.4 −80.1 −69.7 −58.3 −69.9\nepi-Cedrol −76.4 −88.4 −92.2 −68.5 −55.5 −75.9\nChamazulene −97.6 −96.4 −110.9 −76.9 −73.7 −95.6\n(−)-cis-Chrystanthyl acetate −83.2 −77.5 −87.1 −71.5 −60.2 −80.9\n(−)-trans−Chrysanthenyl acetate −77.0 −81.4 −85.3 −65.9 −68.9 −72.4\n1,8-Cineole −72.7 −67.6 −71.5 −58.1 −58.6 −61.0\n(E)-Cinnamaldehyde −93.1 −85.8 −100.0 −76.4 −73.1 −81.0\n(E)-Cinnamyl acetate −99.4 −88.0 −108.9 −76.9 −80.6 −89.5\n(R)-Citronellal −99.9 −91.6 −105.0 −75.1 −73.3 −88.0\n(S)-Citronellal −98.3 −88.9 −107.4 −72.1 −71.4 −86.2\n(R)-Citronellol −99.9 −90.2 −104.9 −75.7 −72.3 −84.9\n(S)-Citronellol −99.2 −92.2 −107.6 −74.2 −77.4 −85.1\n(R)-Citronellyl formate −105.5 −92.6 −109.9 −72.8 −76.2 −90.5\n(S)-Citronellyl formate −101.5 −96.4 −114.7 −81.9 −78.3 −91.0\nα-Copaene −84.1 −78.9 −85.9 −60.2 −59.6 −77.1\nCostunolide −94.5 −99.2 −110.2 −78.2 −74.9 −92.6\n(R)-Cryptone −86.6 −82.4 −93.5 −68.2 −70.4 −74.8\n(S)-Cryptone −81.5 −82.9 −94.9 −69.8 −70.6 −76.6\nβ-Cubebene −90.8 −92.0 −86.7 −76.0 −71.2 −89.8\nCuminaldehyde −86.2 −80.5 −103.3 −74.9 −67.5 −81.7\nar-Curcumene −105.3 −94.0 −108.6 −82.8 −75.8 −96.4\nCurcumol −83.0 −93.4 −91.2 −73.5 −69.6 −86.0\nCurdione −86.2 −98.1 −99.0 −77.3 −71.7 −92.0\nCurzerene −91.5 −86.0 −104.2 −76.8 −67.6 −90.5\nm-Cymene −83.6 −81.3 −92.8 −72.0 −67.6 −79.0\no-Cymene −83.2 −78.3 −87.7 −63.9 −63.3 −72.9\np-Cymene −79.7 −78.7 −91.0 −70.3 −63.9 −75.4\n(E)-β-Damascenone −85.2 −87.6 −110.2 −73.8 −73.8 −84.8\n(2E,4E)-Decadienal −105.7 −97.7 −112.5 −81.8 −78.7 −90.0\nDodecanal −102.8 −93.9 −101.9 −77.9 −73.3 −94.9\nEremanthin −97.7 −97.7 −98.0 −83.7 −81.3 −100.9\nβ-Eudesmol −97.6 −87.4 −106.5 −75.8 −64.5 −74.7\nγ-Eudesmol −93.6 −89.9 −94.7 −69.4 −66.1 −84.3\nEugenol −93.2 −91.7 −105.2 −80.0 −79.1 −88.4\nEugenol methyl ether −88.5 −85.3 −111.1 −71.7 −68.6 −89.3\nEugenyl acetate −96.3 −89.3 −115.1 −75.6 −70.6 −94.9\n(E,E)-α-Farnesene −115.0 −107.5 −112.8 −86.8 −85.3 −100.3\n(E)-β-Farnesene −115.4 −105.0 −116.3 −87.1 −82.9 −100.7\n(E,E)-Farnesol −112.4 −104.6 −121.4 −89.6 −80.8 −100.9\n(+)-Fenchone −80.0 −80.9 −87.1 −66.1 −60.8 −66.9\n(-)-Fenchone −83.3 −67.5 −86.2 −66.5 −60.9 −68.8\nFlavesone −82.3 −84.0 −95.7 −68.9 −64.4 −78.9\nGeranial −101.7 −90.8 −113.0 −76.1 −74.5 −92.0\nGeraniol −103.5 −98.5 −110.2 −77.4 −76.4 −93.8\nGeranyl formate −105.9 −93.9 −111.4 −80.8 −80.3 −96.2\nGermacrene D −92.1 −96.7 −110.5 −77.1 −73.0 −87.3\nGermacrone −85.1 −97.1 −94.9 −71.6 −67.1 −80.9\nGuiaol −94.1 −92.5 −113.4 −79.2 −79.4 −91.9\nα-Gurjunene −89.9 −83.2 −81.3 −71.5 −61.3 −79.8\nβ-Gurjunene −77.4 −64.1 −81.1 −64.1 −58.0 −75.1\nα-Himachalene −80.4 −89.7 −86.5 −63.7 −67.9 −74.3\nβ-Himachalene −85.5 −81.3 −88.6 −68.1 −62.9 −77.2\nHimachalol −77.2 −88.3 −100.8 −63.6 −63.7 −75.6\nα-Humulene −88.9 −90.9 −89.1 −74.9 −70.6 −86.7\nLeptospermone −85.5 −83.2 −92.9 −71.2 −64.1 −80.0\niso-Leptospermone −86.1 −82.7 −93.7 −69.1 −62.6 −83.5\n(R)-Limonene −82.2 −76.2 −92.0 −72.6 −67.3 −79.0\n(S)-Limonene −82.2 −73.8 −92.2 −72.4 −66.1 −77.5\n(R,S,R)-Limonene oxide −86.3 −77.7 −100.8 −76.7 −68.1 −85.1\n(S,R,R)-Limonene oxide −83.5 −87.4 −89.4 −66.7 −63.4 −76.4\n(S,R,S)-Limonene oxide −84.7 −80.7 −95.8 −74.9 −66.7 −83.8\n(R)-Linalool −96.0 −89.3 −101.4 −70.9 −79.0 −87.0\n(S)-Linalool −100.7 −87.5 −102.1 −71.4 −70.4 −87.8\n(R)-Linalyl acetate −101.4 −88.9 −105.1 −73.0 −74.3 −82.5\n(S)-Linalyl acetate −102.8 −90.8 −106.0 −68.5 −74.5 −82.3\np-Mentha-1(7),8-diene −82.3 −82.2 −94.3 −69.5 −65.9 −79.3\n(+)-Menthol −82.9 −86.2 −95.0 −71.8 −66.6 −77.7\n(-)-Menthol −82.3 −84.5 −95.1 −71.1 −69.2 −79.4\nMenthone −83.2 −77.8 −94.7 −69.3 −70.0 −74.4\niso-Menthone −81.0 −79.8 −97.6 −64.4 −63.5 −80.1\nα-Muurolene −86.9 −81.9 −96.9 −72.0 −66.0 −83.7\n(+)-γ-Muurolene −82.3 −82.9 −83.1 −72.2 −66.6 −84.4\n(-)-γ-Muurolene −88.4 −86.2 −106.7 −74.5 −68.5 −86.8\nMyrcene −98.7 −90.1 −102.2 −74.9 −71.4 −84.3\nNeral −102.6 −91.8 −110.5 −81.5 −72.4 −91.2\n(E)-Nerolidol −110.7 −101.4 −113.8 −83.5 −76.1 −100.6\n(E)-β-Ocimene −97.0 −90.2 −103.6 −76.3 −75.6 −86.7\n(Z)-β-Ocimene −98.3 −88.7 −103.2 −78.6 −73.9 −85.1\nOctanal −89.7 −83.8 −99.5 −71.3 −72.4 −80.5\n(R)-2-Octen-3-ol −88.1 −88.4 −96.6 −71.9 −70.7 −81.9\n(S)-1-Octen-3-ol −94.2 −90.7 −93.4 −77.1 −74.7 −80.0\n3-Octanone −88.9 −85.3 −94.7 −71.7 −72.9 −80.3\nPatchouli alcohol −63.5 −57.1 −66.7 −51.8 −43.0 −67.9\n(R)-Phellandral −87.6 −85.9 −102.5 −74.4 −66.2 −81.1\n(S)-Phellandral −87.7 −83.7 −101.6 −74.4 −66.5 −79.2\n(R)-α-Phellandrene −81.1 −82.9 −92.5 −70.1 −65.3 −76.4\n(S)-α-Phellandrene −81.6 −82.5 −92.3 −69.7 −65.6 −76.6\n(R)-β-Phellandrene −84.4 −83.7 −94.0 −69.8 −65.5 −75.2\n(S)-β-Phellandrene −82.9 −84.5 −94.0 −71.2 −67.5 −77.7\nPhytol −106.3 −94.2 −118.9 −74.9 −75.6 −93.3\nPhytone −106.4 −94.3 −116.9 −79.8 −72.3 −90.4\n(+)-α-Pinene −79.0 −70.7 −79.7 −59.4 −54.6 −63.7\n(-)-α-Pinene −77.3 −70.4 −72.9 −61.3 −54.7 −63.6\n(+)-β-Pinene −76.8 −71.8 −79.4 −63.7 −53.0 −65.2\n(-)-β-Pinene −78.8 −73.6 −73.9 −61.9 −56.1 −64.7\n(+)-Pinocamphone −74.9 −72.6 −79.4 −63.2 −62.4 −66.4\n(-)-Pinocamphone −73.2 −79.3 −81.8 −62.0 −61.4 −67.2\n(+)-iso-Pinocamphone −74.9 −75.0 −74.9 −66.6 −55.1 −66.5\n(-)-iso-Pinocamphone −77.1 −80.7 −77.5 −64.0 −55.6 −68.3\n(+)-cis-Pinocarveol −73.9 −78.1 −79.5 −67.7 −57.4 −70.2\n(-)-cis-Pinocarveol −74.1 −76.5 −78.8 −67.0 −58.6 −66.3\n(+)-trans-Pinocarveol −74.7 −80.5 −78.7 −65.8 −57.2 −70.6\n(-)-trans-Pinocarveol −77.6 −80.0 −82.6 −60.5 −55.5 −70.8\n(+)-Piperitone oxide −82.0 −81.5 −98.5 −66.2 −65.2 −77.8\n(-)-Piperitone oxide −81.6 −83.9 −94.9 −68.6 −60.8 −82.8\n(-)-iso-Pulegol −82.5 −85.1 −98.8 −75.2 −66.7 −79.3\n(R)-Pulegone −84.0 −83.1 −96.1 −66.4 −65.5 −78.3\n(S)-Pulegone −83.6 −78.6 −93.3 −67.2 −66.2 −78.9\nRotundifolone −83.1 −79.0 −96.6 −66.4 −62.1 −80.7\n(+)-Sabinene −86.4 −84.0 −92.2 −70.5 −68.6 −77.4\n(-)-Sabinene −87.8 −85.9 −94.7 −71.5 −69.6 −77.0\ncis-Sabinene hydrate −82.4 −81.1 −92.4 −68.0 −60.8 −78.2\n(Z)-α-Santalol −105.7 −95.3 −108.8 −84.7 −70.7 −95.8\n(E)-β-Santalol −104.8 −95.6 −106.2 −77.0 −70.9 −86.6\n(Z)-β-Santalol −104.4 −94.4 −106.2 −79.8 −73.2 −92.2\nβ-Sesquiphellandrene −103.8 −99.0 −115.7 −84.8 −75.3 −101.1\nSpathulenol −90.7 −88.0 −98.4 −77.8 −67.9 −90.4\n(Z)-Spiroether −111.8 −84.9 −103.1 −87.1 −79.3 −102.0\nγ-Terpinene −81.3 −79.3 −93.2 −71.2 −65.3 −76.6\n(R)-Terpinen-4-ol −80.4 −81.9 −89.5 −69.0 −64.9 −75.3\n(S)-Terpinen-4-ol −82.1 −81.8 −88.0 −70.4 −64.4 −76.4\n(R)-α-Terpineol −82.6 −88.3 −91.6 −65.6 −66.0 −72.6\n(S)-α-Terpineol −88.7 −86.8 −94.1 −71.6 −63.5 −82.0\nTerpinolene −80.7 −80.1 −94.7 −68.8 −63.9 −77.4\n(-)-α-Thujone −87.2 −89.3 −94.5 −66.9 −69.2 −78.1\n(+)-β-Thujone −86.9 −80.5 −94.2 −73.7 −69.7 −79.2\nThymohydroquinone dimethyl ether −89.5 −82.8 −104.6 −73.1 −67.0 −85.0\nThymol −84.4 −87.5 −94.6 −72.9 −70.8 −78.4\n2-Undecanone −101.3 −94.0 −108.3 −78.4 −72.8 −90.2\nValencene −84.7 −81.7 −92.6 −74.4 −68.3 −81.7\n(+)-Verbenone −84.7 −73.2 −82.5 −68.4 −54.8 −71.2\n(-)-Verbenone −83.8 −77.7 −77.4 −65.4 −57.8 −68.0\nViridiflorene −86.8 −90.2 −91.0 −76.3 −69.4 −88.8\nα-Zingiberene −106.4 −100.5 −115.4 −82.7 −71.4 −98.6\na Human angiotensin-converting enzyme 2 (hACE2).\nTable 4 Normalized docking scores ( DSnorm, kJ/mol) of essential oil components with bovine odorant binding protein (BtOBP), cruzain, torpedo acetylcholinesterase (TcAChE), Bacillus anthracis nicotinate mononucleotide adenylytransferase (BaNadD), Russell’s viper phospholipase A2 (DrPLA2), and Escherichia coli l-aspartate aminotransferase (EcAspTA).\nCompound BtOBP Cruzain TcAChE BaNadD DrPLA2 EcAspTA\n1GT3 1ME3 6G1U 3HFJ 1FV0 2Q7W\n(E)-Anethole −90.2 −73.3 −96.8 −112.9 −85.3 −88.1\nallo-Aromadendrene −85.0 −70.6 −92.8 −105.8 −87.8 −79.6\nArtemiseole −84.8 −74.2 −84.2 −90.6 −68.0 −71.7\n(R)-Artemisia alcohol −88.4 −68.3 −89.5 −94.8 −80.7 −81.5\n(S)-Artemisia alcohol −86.1 −74.0 −94.8 −101.4 −82.5 −81.4\nArtemisia ketone −93.1 −77.3 −91.5 −107.9 −87.8 −80.6\nAscaridole −79.7 −54.4 −72.1 −79.7 −75.0 −65.3\nBenzyl benzoate −105.0 −82.8 −115.8 −128.1 −97.3 −89.9\n(Z)-trans-α-Bergamotol −1 00.7 −73.6 −107.0 −94.2 −92.6 −85.8\nBicyclogermacrene −97.5 −82.4 −95.6 −105.5 −89.7 −89.0\nBicyclosesquiphellandrene −92.2 −52.5 −91.2 −110.7 −88.4 −75.7\nα-Bisabolol oxide A −94.7 −66.1 −102.8 −102.6 −77.1 −82.7\nα-Bisabolol oxide B −104.6 −90.4 −107.0 −121.9 −94.2 −89.8\nBisabolone oxide A −100.1 −71.9 −96.8 −84.7 −81.2 −86.7\n(+)-Borneol −72.5 −51.0 −72.0 −47.8 −61.4 −62.5\n(-)-Borneol −78.3 −53.1 −70.8 −49.0 −63.3 −56.2\n(+)-iso-Borneol −73.7 −55.6 −74.6 −31.0 −60.9 −59.7\n(-)-iso-Borneol −73.2 −55.3 −77.7 −52.6 −51.0 −57.4\nα-Bulnesene −93.4 −89.3 −109.3 −115.7 −94.4 −95.3\nδ-Cadinene −79.5 −86.8 −105.1 −116.8 −94.8 −82.3\nΤ-Cadinol −87.8 −71.8 −117.7 −121.7 −86.0 −87.0\n(R)-Calamene −80.3 −84.4 −116.5 −120.4 −91.3 −87.7\n(S)-Calamene −80.1 −82.5 −116.2 −121.8 −93.0 −88.3\n(+)-Camphene −79.0 −62.1 −77.0 −75.9 −69.3 −67.5\n(-)-Camphene −77.7 −62.8 −75.2 −77.4 −71.3 −70.6\n(+)-Camphor −76.0 −57.0 −75.0 −49.0 −53.5 −54.1\n(-)-Camphor −80.0 −54.1 −74.4 −52.9 −61.2 −56.4\n(+)-δ-3-Carene −80.4 −64.2 −80.6 −88.0 −71.8 −72.5\n(-)-δ-3-Carene −82.0 −68.9 −84.4 −90.2 −72.8 −72.9\nCarvacrol −82.4 −77.7 −94.8 −106.7 −81.6 −87.5\nCarvacrol methyl ether −85.6 −79.3 −96.6 −111.5 −84.2 −93.6\n(+)-cis-Carveol −89.1 −77.3 −96.9 −109.4 −81.3 −87.6\n(-)-cis-Carveol −89.0 −82.1 −95.5 −109.0 −83.2 −89.4\n(R)-Carvone −86.0 −80.7 −94.6 −109.9 −83.5 −91.5\n(S)-Carvone −88.0 −77.2 −94.1 −105.9 −82.8 −87.2\n(E)-Caryophyllene −87.3 −60.4 −88.1 −87.3 −87.4 −78.6\nCaryophyllene oxide −95.1 −73.1 −90.1 −97.0 −83.8 −77.8\nCedrol −87.7 −63.1 −96.4 −84.4 −86.3 −70.9\nepi-Cedrol −84.0 −59.7 −83.3 −86.7 −80.0 −76.2\nChamazulene −95.2 −89.2 −123.0 −132.1 −98.9 −101.6\n(-)-cis-Chrystanthyl acetate −85.8 −63.7 −89.8 −73.8 −76.5 −71.5\n(-)-trans-Chrysanthenyl acetate −80.9 −69.7 −82.4 −78.5 −76.5 −68.6\n1,8-Cineole −69.3 −51.1 −73.2 −54.4 −49.4 −47.3\n(E)-Cinnamaldehyde −87.7 −77.6 −98.2 −110.1 −85.7 −89.5\n(E)-Cinnamyl acetate −95.9 −88.2 −107.4 −132.5 −94.6 −103.1\n(R)-Citronellal −98.1 −90.5 −109.3 −120.7 −88.3 −105.7\n(S)-Citronellal −95.0 −89.7 −108.5 −123.3 −86.9 −104.1\n(R)-Citronellol −91.0 −90.0 −108.2 −122.4 −88.6 −107.7\n(S)-Citronellol −92.5 −91.9 −108.5 −122.0 −90.3 −100.3\n(R)-Citronellyl formate −98.0 −93.5 −118.7 −129.5 −87.5 −108.5\n(S)-Citronellyl formate −99.7 −95.1 −111.2 −135.6 −91.5 −94.8\nα-Copaene −88.9 −69.9 −84.6 −78.7 −81.7 −61.9\nCostunolide −106.8 −87.5 −116.7 −120.1 −100.3 −89.1\n(R)-Cryptone −74.9 −68.1 −92.2 −100.0 −78.5 −80.8\n(S)-Cryptone −79.0 −68.5 −91.6 −100.7 −82.7 −79.6\nβ-Cubebene −99.8 −67.2 −106.9 −112.2 −93.9 −94.8\nCuminaldehyde −84.9 −79.1 −95.3 −109.1 −90.1 −89.5\nar-Curcumene −98.1 −87.5 −116.0 −125.7 −94.1 −95.3\nCurcumol −90.1 −67.6 −100.4 −88.0 −87.6 −81.5\nCurdione −96.4 −75.1 −99.3 −116.3 −91.0 −78.7\nCurzerene −96.4 −80.3 −109.4 −89.7 −91.1 −86.4\nm-Cymene −78.9 −73.1 −96.1 −99.1 −76.6 −88.0\no-Cymene −77.0 −61.9 −89.8 −97.8 −76.2 −77.2\np-Cymene −82.8 −73.2 −91.3 −96.8 −80.9 −84.3\n(E)-β-Damascenone −90.1 −80.5 −100.7 −105.4 −88.9 −80.0\n(2E,4E)-Decadienal −96.4 −87.0 −110.4 −129.7 −95.8 −114.8\nDodecanal −95.8 −83.7 −110.3 −127.3 −89.2 −108.9\nEremanthin −80.1 −87.9 −121.3 −132.4 −98.7 −91.8\nβ-Eudesmol −95.2 −76.1 −98.6 −114.1 −85.3 −87.1\nγ-Eudesmol −94.9 −78.2 −106.1 −105.2 −89.7 −89.1\nEugenol −90.4 −82.4 −103.9 −119.3 −87.3 −98.8\nEugenol methyl ether −93.6 −78.1 −106.3 −116.8 −89.3 −94.4\nEugenyl acetate −94.9 −83.4 −109.2 −126.1 −100.1 −104.6\n(E,E)-α-Farnesene −115.5 −103.7 −129.8 −131.8 −101.2 −111.4\n(E)-β-Farnesene −112.1 −103.2 −122.7 −131.8 −105.3 −108.6\n(E,E)-Farnesol −116.8 −96.2 −133.0 −135.6 −100.5 −109.0\n(+)-Fenchone −78.4 −60.5 −79.5 −79.8 −62.4 −69.9\n(-)-Fenchone −80.3 −61.5 −81.0 −84.2 −65.5 −60.7\nFlavesone −87.1 −56.0 −88.6 −92.1 −85.2 −80.3\nGeranial −96.5 −94.9 −111.7 −119.3 −92.1 −101.5\nGeraniol −95.5 −93.6 −109.7 −118.0 −94.3 −107.3\nGeranyl formate −100.2 −89.7 −115.4 −128.3 −94.8 −114.1\nGermacrene D −102.4 −88.8 −109.9 −116.5 −93.7 −90.0\nGermacrone −92.4 −68.3 −94.5 −102.9 −88.3 −80.0\nGuiaol −100.8 −88.5 −113.3 −107.5 −92.6 −94.0\nα-Gurjunene −80.6 −61.6 −84.6 −100.0 −83.6 −78.1\nβ-Gurjunene −89.3 −38.8 −80.3 11.3 −77.6 −71.1\nα-Himachalene −89.2 −67.9 −83.9 −96.3 −87.6 −73.4\nβ-Himachalene −81.9 −65.4 −96.1 −110.8 −91.4 −76.8\nHimachalol −91.5 −64.1 −81.2 −24.7 −81.7 −66.3\nα-Humulene −94.0 −80.0 −89.9 −113.6 −89.2 −82.5\nLeptospermone −89.6 −64.0 −92.2 −102.7 −88.8 −80.7\niso-Leptospermone −92.8 −63.0 −90.1 −99.4 −86.2 −78.2\n(R)-Limonene −86.2 −75.7 −92.4 −99.6 −81.7 −86.8\n(S)-Limonene −84.9 −77.6 −93.4 −99.8 −83.3 −87.3\n(R,S,R)-Limonene oxide −87.1 −76.0 −93.2 −110.7 −84.9 −86.3\n(S,R,R)-Limonene oxide −84.6 −68.8 −85.0 −84.3 −76.2 −69.8\n(S,R,S)-Limonene oxide −91.2 −73.8 −97.4 −93.6 −85.1 −87.9\n(R)-Linalool −95.5 −89.9 −116.6 −112.4 −90.3 −89.9\n(S)-Linalool −93.0 −88.9 −110.1 −111.9 −91.0 −95.7\n(R)-Linalyl acetate −96.9 −87.1 −107.1 −112.5 −87.1 −95.2\n(S)-Linalyl acetate −100.0 −90.5 −110.2 −114.3 −86.6 −87.1\np-Mentha-1(7),8-diene −83.3 −74.4 −93.6 −100.0 −82.9 −84.9\n(+)-Menthol −86.1 −66.4 −98.6 −106.1 −79.2 −90.8\n(-)-Menthol −81.0 −68.9 −97.5 −106.3 −80.5 −89.7\nMenthone −82.4 −72.0 −92.6 −98.2 −82.8 −83.5\niso-Menthone −79.9 −64.8 −88.2 −102.4 −75.1 −82.0\nα-Muurolene −91.2 −79.9 −95.6 −113.7 −90.0 −82.8\n(+)-γ-Muurolene −85.2 −77.0 −98.7 −113.9 −93.2 −78.7\n(-)-γ-Muurolene −83.1 −83.4 −96.9 −106.3 −82.9 −80.5\nMyrcene −90.4 −88.8 −109.0 −112.7 −90.3 −101.1\nNeral −95.1 −94.1 −111.1 −122.8 −90.9 −105.4\n(E)-Nerolidol −111.5 −101.8 −131.9 −131.3 −99.6 −110.5\n(E)-β-Ocimene −91.8 −89.4 −104.6 −116.4 −89.0 −97.0\n(Z)-β-Ocimene −89.7 −90.6 −106.8 −112.1 −90.3 −94.4\nOctanal −85.8 −79.8 −97.6 −112.0 −85.7 −102.7\n(R)-2-Octen-3-ol −84.3 −81.5 −106.9 −107.1 −83.3 −101.1\n(S)-1-Octen-3-ol −84.5 −82.4 −108.4 −105.9 −85.0 −99.5\n3-Octanone −84.2 −82.5 −102.6 −111.6 −82.9 −101.8\nPatchouli alcohol −75.1 −41.4 −71.1 100.1 −10.1 −49.2\n(R)-Phellandral −92.3 −79.3 −97.4 −108.1 −88.9 −89.5\n(S)-Phellandral −92.9 −79.9 −96.1 −109.2 −88.9 −88.8\n(R)-α-Phellandrene −84.0 −69.7 −94.7 −100.8 −82.4 −83.8\n(S)-α-Phellandrene −84.3 −69.6 −93.5 −99.4 −82.6 −80.6\n(R)-β-Phellandrene −82.2 −69.9 −93.5 −102.0 −80.6 −84.1\n(S)-β-Phellandrene −83.8 −69.0 −93.2 −100.5 −80.2 −81.2\nPhytol −112.8 −93.8 −132.4 −134.7 −102.4 −112.9\nPhytone −117.8 −92.1 −124.5 −131.1 −99.7 −107.2\n(+)-α-Pinene −74.2 −58.0 −73.4 −62.4 −62.5 −54.4\n(-)-α-Pinene −72.8 −58.3 −70.4 −64.6 −61.7 −57.2\n(+)-β-Pinene −70.9 −57.8 −74.0 −64.1 −60.9 −55.5\n(-)-β-Pinene −73.5 −58.4 −73.1 −65.0 −63.7 −57.0\n(+)-Pinocamphone −76.5 −58.2 −73.6 −53.1 −55.4 −63.6\n(-)-Pinocamphone −76.6 −66.1 −76.5 −65.9 −72.3 −62.7\n(+)-iso-Pinocamphone −75.3 −59.0 −76.6 −54.0 −59.1 −58.1\n(-)-iso-Pinocamphone −76.2 −59.6 −76.7 −56.4 −65.8 −56.2\n(+)-cis-Pinocarveol −75.7 −58.2 −75.2 −51.7 −57.5 −58.1\n(-)-cis-Pinocarveol −75.7 −63.9 −73.5 −52.5 −66.3 −54.5\n(+)-trans-Pinocarveol −77.5 −60.6 −76.5 −71.1 −63.9 −61.4\n(-)-trans-Pinocarveol −72.4 −58.6 −77.2 −71.4 −56.3 −62.6\n(+)-Piperitone oxide −88.5 −70.5 −100.5 −104.2 −80.4 −78.0\n(-)-Piperitone oxide −86.0 −73.6 −99.6 −104.5 −80.7 −83.8\n(-)-iso-Pulegol −85.1 −72.0 −93.5 −106.7 −83.5 −93.8\n(R)-Pulegone −81.8 −69.9 −90.3 −103.9 −78.4 −74.4\n(S)-Pulegone −79.7 −69.6 −89.3 −99.9 −81.5 −76.4\nRotundifolone −86.1 −72.1 −96.1 −100.0 −82.4 −72.1\n(+)-Sabinene −87.9 −66.6 −84.5 −92.1 −80.5 −78.2\n(-)-Sabinene −79.7 −68.4 −91.4 −96.0 −80.8 −75.8\ncis-Sabinene hydrate −88.1 −70.2 −84.5 −91.1 −72.3 −68.1\n(Z)-α-Santalol −108.5 −85.6 −113.4 −106.8 −96.8 −90.7\n(E)-β-Santalol −105.0 −90.2 −110.6 −113.3 −94.3 −94.0\n(Z)-β-Santalol −108.0 −85.3 −110.4 −110.9 −96.5 −92.6\nβ-Sesquiphellandrene −103.9 −92.2 −116.6 −127.5 −99.4 −98.3\nSpathulenol −95.9 −94.8 −97.7 −102.8 −84.3 −102.2\n(Z)-Spiroether −112.8 −85.5 −124.3 −136.1 −101.5 −102.9\nγ-Terpinene −84.3 −74.9 −93.4 −98.7 −82.8 −85.9\n(R)-Terpinen-4-ol −87.3 −66.7 −81.5 −94.0 −80.2 −72.2\n(S)-Terpinen-4-ol −87.1 −67.2 −78.9 −92.3 −80.2 −71.7\n(R)-α-Terpineol −82.0 −68.0 −80.3 −82.2 −77.6 −71.3\n(S)-α-Terpineol −76.9 −75.5 −103.6 −101.7 −86.6 −84.9\nTerpinolene −83.1 −69.8 −89.0 −101.8 −84.8 −72.9\n(-)-α-Thujone −81.4 −66.2 −84.9 −93.4 −72.6 −74.1\n(+)-β-Thujone −87.6 −66.4 −89.9 −102.9 −71.7 −86.9\nThymohydroquinone dimethyl ether −86.3 −75.8 −103.7 −116.0 −85.3 −95.5\nThymol −84.4 −70.8 −96.4 −107.1 −79.7 −91.8\n2-Undecanone −94.5 −90.2 −110.0 −129.7 −91.9 −107.6\nValencene −96.7 −75.1 −103.3 −114.7 −87.8 −76.6\n(+)-Verbenone −74.3 −64.5 −79.3 −71.6 −63.9 −72.3\n(-)-Verbenone −73.5 −63.1 −78.0 −65.3 −64.8 −59.3\nViridiflorene −81.9 −68.6 −102.1 −106.9 −73.1 −81.9\nα-Zingiberene −108.3 −90.9 −113.8 −123.4 −97.7 −99.9 "}

{"project":"LitCovid-PD-HP","denotations":[{"id":"T1","span":{"begin":1641,"end":1660},"obj":"Phenotype"},{"id":"T2","span":{"begin":7849,"end":7854},"obj":"Phenotype"},{"id":"T3","span":{"begin":10054,"end":10059},"obj":"Phenotype"},{"id":"T4","span":{"begin":10083,"end":10088},"obj":"Phenotype"},{"id":"T5","span":{"begin":10494,"end":10499},"obj":"Phenotype"},{"id":"T6","span":{"begin":13774,"end":13782},"obj":"Phenotype"},{"id":"T7","span":{"begin":14567,"end":14575},"obj":"Phenotype"},{"id":"T8","span":{"begin":14609,"end":14617},"obj":"Phenotype"},{"id":"T9","span":{"begin":15946,"end":15954},"obj":"Phenotype"},{"id":"T10","span":{"begin":17981,"end":17989},"obj":"Phenotype"},{"id":"T11","span":{"begin":26413,"end":26427},"obj":"Phenotype"},{"id":"T12","span":{"begin":27011,"end":27016},"obj":"Phenotype"},{"id":"T13","span":{"begin":31300,"end":31305},"obj":"Phenotype"},{"id":"T14","span":{"begin":40228,"end":40233},"obj":"Phenotype"},{"id":"T15","span":{"begin":40690,"end":40695},"obj":"Phenotype"},{"id":"T16","span":{"begin":41130,"end":41135},"obj":"Phenotype"},{"id":"T17","span":{"begin":41715,"end":41720},"obj":"Phenotype"},{"id":"T18","span":{"begin":46935,"end":46940},"obj":"Phenotype"},{"id":"T19","span":{"begin":50954,"end":50966},"obj":"Phenotype"},{"id":"T20","span":{"begin":54018,"end":54023},"obj":"Phenotype"}],"attributes":[{"id":"A1","pred":"hp_id","subj":"T1","obj":"http://purl.obolibrary.org/obo/HP_0002086"},{"id":"A2","pred":"hp_id","subj":"T2","obj":"http://purl.obolibrary.org/obo/HP_0001945"},{"id":"A3","pred":"hp_id","subj":"T3","obj":"http://purl.obolibrary.org/obo/HP_0001945"},{"id":"A4","pred":"hp_id","subj":"T4","obj":"http://purl.obolibrary.org/obo/HP_0001945"},{"id":"A5","pred":"hp_id","subj":"T5","obj":"http://purl.obolibrary.org/obo/HP_0001945"},{"id":"A6","pred":"hp_id","subj":"T6","obj":"http://purl.obolibrary.org/obo/HP_0003764"},{"id":"A7","pred":"hp_id","subj":"T7","obj":"http://purl.obolibrary.org/obo/HP_0003764"},{"id":"A8","pred":"hp_id","subj":"T8","obj":"http://purl.obolibrary.org/obo/HP_0003764"},{"id":"A9","pred":"hp_id","subj":"T9","obj":"http://purl.obolibrary.org/obo/HP_0003764"},{"id":"A10","pred":"hp_id","subj":"T10","obj":"http://purl.obolibrary.org/obo/HP_0003764"},{"id":"A11","pred":"hp_id","subj":"T11","obj":"http://purl.obolibrary.org/obo/HP_0030159"},{"id":"A12","pred":"hp_id","subj":"T12","obj":"http://purl.obolibrary.org/obo/HP_0001945"},{"id":"A13","pred":"hp_id","subj":"T13","obj":"http://purl.obolibrary.org/obo/HP_0001945"},{"id":"A14","pred":"hp_id","subj":"T14","obj":"http://purl.obolibrary.org/obo/HP_0001945"},{"id":"A15","pred":"hp_id","subj":"T15","obj":"http://purl.obolibrary.org/obo/HP_0001945"},{"id":"A16","pred":"hp_id","subj":"T16","obj":"http://purl.obolibrary.org/obo/HP_0001945"},{"id":"A17","pred":"hp_id","subj":"T17","obj":"http://purl.obolibrary.org/obo/HP_0001945"},{"id":"A18","pred":"hp_id","subj":"T18","obj":"http://purl.obolibrary.org/obo/HP_0001945"},{"id":"A19","pred":"hp_id","subj":"T19","obj":"http://purl.obolibrary.org/obo/HP_0002383"},{"id":"A20","pred":"hp_id","subj":"T20","obj":"http://purl.obolibrary.org/obo/HP_0001945"}],"text":"Essential Oils as Antiviral Agents, Potential of Essential Oils to Treat SARS-CoV-2 Infection: An In-Silico Investigation\n\nAbstract\nEssential oils have shown promise as antiviral agents against several pathogenic viruses. In this work we hypothesized that essential oil components may interact with key protein targets of the 2019 severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2). A molecular docking analysis was carried out using 171 essential oil components with SARS-CoV-2 main protease (SARS-CoV-2 Mpro), SARS-CoV-2 endoribonucleoase (SARS-CoV-2 Nsp15/NendoU), SARS-CoV-2 ADP-ribose-1″-phosphatase (SARS-CoV-2 ADRP), SARS-CoV-2 RNA-dependent RNA polymerase (SARS-CoV-2 RdRp), the binding domain of the SARS-CoV-2 spike protein (SARS-CoV-2 rS), and human angiotensin−converting enzyme (hACE2). The compound with the best normalized docking score to SARS-CoV-2 Mpro was the sesquiterpene hydrocarbon (E)-β-farnesene. The best docking ligands for SARS−CoV Nsp15/NendoU were (E,E)-α-farnesene, (E)-β-farnesene, and (E,E)−farnesol. (E,E)−Farnesol showed the most exothermic docking to SARS-CoV-2 ADRP. Unfortunately, the docking energies of (E,E)−α-farnesene, (E)-β-farnesene, and (E,E)−farnesol with SARS-CoV-2 targets were relatively weak compared to docking energies with other proteins and are, therefore, unlikely to interact with the virus targets. However, essential oil components may act synergistically, essential oils may potentiate other antiviral agents, or they may provide some relief of COVID-19 symptoms.\n\n1. Introduction\nThe 2019 severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) is a newly emerging respiratory illness. The epidemic started in December 2019 in Wuhan, China, and has rapidly spread throughout China and the world and is now a global pandemic. SARS-CoV-2 can be efficiently transmitted among humans and has shown a high degree of morbidity and mortality [1,2]. As of April 20, 2020, the worldwide number of infected individuals was 2,544,792, with as many as 175,694 deaths [3]. There are currently no approved vaccines available for the prevention of SARS-CoV-2 infection and only just recently, remdesivir has received “emergency use authorization” for treatment of COVID-19 in the United States; therefore, there is an urgent demand for potential chemotherapeutic agents to treat this disease.\nEssential oils have been screened against several pathogenic viruses (Table 1), including influenza and other respiratory viral infections. Influenza is an infectious respiratory disease caused by one of three types of influenza viruses, type A, type B, or type C [4]. The most significant in terms of human morbidity and mortality is influenza virus type A, which is found in several bird and mammal species [5]. Several different serotypes of influenza type A have caused global flu pandemics [6]: H1N1, which caused the Spanish flu in 1918 (40–50 million deaths worldwide) [7] and the swine flu in 2009 [8]; the Asian flu of 1957–1958 (ca. 1.5 million deaths worldwide) was caused by influenza A H2N2 [8]; serotype H3N2 caused the Hong Kong flu in 1968 [9]; and H5N1, which caused the bird flu in 2004 [10]. Influenza virus type B, however, is largely confined to human hosts [11].\nOne study evaluated the in vitro antiviral effect against influenza type A (H1N1) of commercial essential oils that included cinnamon (Cinnamomum zeylanicum), bergamot (Citrus bergamia), lemongrass (Cymbopogon flexuosus), thyme (Thymus vulgaris), and lavender (Lavandula angustifolia). The oils were tested in the liquid phase at a concentration of 0.3% and in the vapor phase. The oils of cinnamon, bergamot, thyme, and lemongrass displayed 100% inhibition of H1N1 in the liquid phase, while the inhibition for lavender essential oil was 85%. However, in the vapor phase, 100% inhibition was observed only for cinnamon leaf essential oil after 30 min of exposure. The bergamot, lemongrass, thyme, and lavender essential oils displayed inhibition rates of 95%, 90%, 70%, and 80%, respectively [12].\nCinnamomum zeylanicum leaf oil is characterized by eugenol (75–85%), followed by smaller amounts of linalool (1.6–8.5%), and benzyl benzoate (0.1–8.3%) [13,14,15]. Bergamot oil is rich in limonene (23–55%), linalool (2–37%), and linalyl acetate (12–41%), with lesser quantities of β-pinene (up to 10%) and γ-terpinene (up to 10%) [16,17,18,19,20]. Geranial (48–54%) and neral (29–33%) have been reported as the major components of C. flexuosus, but many chemotypes, cultivars, and variants have been reported for C. flexuosus [21,22].\nIn the literature, there have been at least 20 different chemotypes identified for thyme essential oil. The “typical” thyme essential oil presents a thymol content of 45% (range 31–50%), with significant concentrations of p-cymene (0.1–26.6%, average = 15.6%) and γ-terpinene (up to 22.8%, average = 9.3%). In addition, there are several other chemotypes of T. vulgaris rich in thymol and/or carvacrol [23]. Thymol has been identified as an anti-influenza agent against influenza type A and parainfluenza type 3 virus [24,25]. Lavandula angustifolia essential oil is rich in linalyl acetate (37.0–43.6%), linalool (19.7–39.1%), geraniol (up to 9.3%), β-caryophyllene (up to 5.1%), terpinen-4-ol (up to 14.9%), lavandulyl acetate (up to 5.5%), and borneol (up to 6.4%) [26,27,28,29].\nAnother essential oil with notable anti-influenza effects is tea tree, which is extracted from the leaves of Melaleuca alternifolia (Myrtaceae). Commercial tea tree oil is composed of terpinen-4-ol (30–48%), γ-terpinene (10–28%), α-terpinene (5–13%), 1,8-cineole (up to 15%), terpinolene (1.5–5%), p-cymene (0.5–12%), α-pinene (1–6%), and α-terpineol (1.5–8%) [30]. Tea tree oil showed 100% inhibition of influenza type A (H1N1) virus at 0.01% concentration and a median inhibitory concentration (IC50) of 6 μg/mL [31,32]. In addition, 30 min exposure of type A (H11N9) virus to tea tree oil vapor caused 100% inhibition [33]. The tea tree oil components, terpinen-4-ol, terpinolene, and α-terpineol, have shown anti-influenza virus activity against type A (H1N1), with IC50 values of 25, 12, and 250 μg/mL, respectively. α-Terpinene, γ-terpinene, and p-cymene were inactive, however [31].\nAvian influenza viruses (H5N1) exhibit both high and low virulence in numerous mammalian species, highlighting the connection between the route of inoculation and virus pathogenicity [34]. Since 2003, there have been over 600 documented cases of human infection with H5N1 viruses, with most cases among young, previously healthy individuals [35]. The essential oils extracted from Citrus reshni leaves and peel (unripe and ripe fruits) were tested against H5N1 virus by plaque reduction assay. The oils showed moderate inhibition of the H5N1 virus at a concentration of 2.5 μL/mL. Sabinene (40.5%), linalool (23.3%), and terpinen-4-ol (8.3%) were the main constituents in the leaf oil while limonene (82.4%, 91.6%) was the main compound in the fruit peel essential oils (unripe and ripe, respectively) [36].\nThe essential oil of leaves of Fortunella margarita is rich in the sesquiterpenoids β-eudesmol (28.3%), α-muurolene (10.3%), β-gurjunene (10.0%), γ-eudesmol (8.4%), and γ-muurolene (6.6%) while the essential oil extracted from the fruits showed monterpenoids as the main components, α-terpineol (55.5%), carvone (5.7%), and carveol (5.5%). Both samples were tested for antiviral activity against avian influenza (H5N1) virus, and the obtained results revealed that the fruit essential oil was more effective (80% virus inhibition by the MTT (3-(4,5-dimethylthiazol-2-yl)-2,5-diphenyltetrazolium bromide) assay using Madin−Darby canine kidney (MDCK) cells for virus propagation). The IC50 values obtained for the leaf and fruit essential oils were 38.89 and 6.77 μg/mL, respectively [53].\nDengue fever, a mosquito−borne disease, is caused by dengue virus (DENV) which includes four major serotypes (DENV-1, -2, -3, and -4). Some serotypes cause more severe diseases than others; severe dengue is associated with secondary infections by a different serotype. Dengue disease is a major public health problem in developing tropical countries and has being continuously spreading to new geographical areas [92]. The essential oils of two species of Lippia were assayed against four dengue serotypes (DENV-1, DENV-2, DENV-3, DENV-4) [61]. The IC50 values for Lippia alba oil, rich in carvone (39.7%), limonene (30.6%), and bicyclosesquiphellandrene (8.9%), were between 0.4 and 32.6 μg/mL. However, the Lippia citrodora essential oil, composed of geranial (18.9%), neral (15.6%), limonene (10.7%), and 1,8-cineole (5.0%), showed the best activity, with IC50 values varying from 1.9 to 33.7 μg/mL. No viral inhibitory effect was observed by addition of the essential oil after virus adsorption; the inhibitory effect of the essential oil seemed to cause direct virus inactivation before adsorption on the host cell.\nThe essential oils of seven aromatic plants from Córdoba, San Luis, and San Juan provinces (Argentina) were screened for cytotoxicity and in vitro inhibitory activity against dengue virus type 2 (DENV−2) [38]. The oils of Jungia polita and Buddleja cordobensis were composed of caryophyllene oxide (9.18%, 32.1%) and β-caryophyllene (8.13%, 16.5%) as the major compounds. However, these oils displayed different IC50 values (86.4 and 39.8 μg/mL, respectively). The other samples were composed mostly of monoterpenes and displayed lower activity, except Pectis odorata oil, which presented limonene (50.2%), neral (27.2%), and geranial (23.6%) as the major compounds and an IC50 value of 39.6 μg/mL. In addition, the essential oils of Artemisia mendozana, rich in camphor (22.4%), artemisole (11.7%), and artemisia alcohol (10.8%); Gailardia megapotamica composed of β-pinene (35.5%), spathulenol (10.7%), and germacrene D (6.8%); and Heterothalamus alienus characterized by β-pinene (35.5%), spathulenol (10.7%), and germacrene D (6.8%), showed an average IC50 value of 130.63 μg/mL.\nYellow fever (YF), caused by yellow fever virus (YFV), has historically been considered one of the most dangerous infectious diseases. YFV is transmitted to humans via mosquitoes of the Haemogogus, Sabethes, and Aedes genera. Annually, there are approximately 80,000–200,000 YFV cases worldwide, with a case fatality rate (CFR) ranging from 20–60% [93,94]. Essential oils of Lippia species and their main compounds have been tested against yellow fever virus (YFV) in Vero cells. The oil of Lippia origanoides showed carvacrol (44.0%), thymol (15.0%), and γ-terpinene (10.0%) as the main compounds and displayed 100% inhibition at a concentration of 11.1 μg/mL [43]. However, in the same study, the oil of L. alba displayed 100% inhibition at a concentration of 100.0 μg/mL. The major compounds were carvone (51.0%), limonene (33.0%), and bicyclosesquiphellandrene (7.0%). The essential oil of L. alba with a similar chemical composition, carvone (39.7%), limonene (30.6%), and bicyclosesquiphellandrene (8.9%), displayed an IC50 value of 4.3 μg/mL against YFV when tested in Vero cells using the MTT assay [62]. The essential oil of L. citriodora, dominated by geranial (18.9%), neral (15.6%), and limonene (10.7%), did not display a statistical difference in comparison to citral, with IC50 values of 19.4 and 17.6 μg/mL, respectively [62].\nIn addition to essential oils, several individual essential oil components have been screened for antiviral activity (Table 2).\nBecause of the activities of several essential oils and essential oil components against human pathogenic viruses, we hypothesized that essential oil components may be potentially useful as antiviral agents against SARS-CoV-2. In this work, we carried out a molecular docking analysis of the major components of essential oils that exhibit antiviral activity (Table 1 and Table 2) with known SARS-CoV-2 protein targets.\n\n2. Results and Discussion\nSeveral proteins have been identified for severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2), which may serve as potential targets for chemotherapeutic intervention in coronavirus disease 2019 (COVID-19). These protein targets include SARS-CoV-2 main protease (SARS-CoV-2 Mpro), SARS-CoV-2 endoribonucleoase (SARS-CoV-2 Nsp15/NendoU), SARS-CoV-2 ADP−ribose−1″−phosphatase (SARS-CoV-2 ADRP), SARS-CoV-2 RNA-dependent RNA polymerase (SARS-CoV-2 RdRp), the binding domain of the SARS-CoV-2 spike protein (SARS-CoV-2 rS), and human angiotensin−converting enzyme (hACE2). There have already been several molecular docking studies on these macromolecular targets. Several groups have carried out molecular docking of natural product libraries with SARS-CoV-2 Mpro [102,103,104,105]. Additionally, commercially available drugs have also been examined using in silico methods [106,107].\nA molecular docking study was carried out with 171 essential oil components with SARS-CoV-2 Mpro (PDB: 5R7Z, 5R80, 5R81, 5R82, 5R83, 5R84, 6LU7, 6M03, and 6Y84), SARS-CoV-2 Nsp15/NendoU (PDB: 6VWW, 6W01, and 6W02), SARS-CoV-2 rS (PDB: 6M0J, 6M17, 6VX1, and 6VW1), and SARS-CoV-2 RdRp (PDB: 6M71). The best docking scores are summarized in Table 3.\nThe main protease, SARS-CoV-2 Mpro, is a cysteine protease that is essential for processing the polyproteins that are translated from the coronavirus RNA [108]. The substrate binding site of the enzyme is a cleft flanked by Gln189, Met49, Pro168, Glu166 and His41; the active site is Cys145 and His41. The compound with the best normalized docking score to SARS-CoV-2 Mpro was the sesquiterpene hydrocarbon (E)-β-farnesene (DSnorm = −115.4 kJ/mol). Other essential oil components showing good docking scores with SARS-CoV-2 Mpro were (E,E)-α-farnesene (DSnorm = −115.0 kJ/mol), (E,E)-farnesol (DSnorm = −112.4 kJ/mol), and (E)-nerolidol (DSnorm = −110.7 kJ/mol). The sesquiterpene hydrocarbons (E,E)-α-farnesene and (E)-β-farnesene occupy the substrate binding site, flanked by Gln189, Arg188, Met165, His41, and Asp 187 (Figure 1). The lowest-energy docked poses of both (E,E)-farnesol and (E)-nerolidol showed hydrogen bonding of the alcohol moiety to Gln192 and Thr190 and, in the case of (E)-nerolidol, also with GLN189 and ARG188 (Figure 2).\nNon-structural protein 15 (Nsp15) of SARS-CoV-2 is an endoribonuclease that preferentially cleaves RNA at uridylate. Furthermore, it has been shown that SARS-CoV Nsp15/NendoU is required for successful viral infection [109]. The best docking ligands for SARS-CoV Nsp15/NendoU are (E,E)-α-farnesene (DSnorm = −107.5 kJ/mol), (E)-β-farnesene (DSnorm = −105.0 kJ/mol), (E,E)-farnesol (DSnorm = −104.6 kJ/mol), and (E)-nerolidol (DSnorm = −101.6 kJ/mol). All of these sesquiterpenoids preferentially docked into a binding site formed by amino acid residues Gln347, Ile328, Val276, Ser274, Thr275, Ser329, Asn74, Asn75, Glu327, and Lys71 (Figure 3). In addition to van der Waals interactions, (E,E)-farnesol showed hydrogen-bonding interactions with Ser329 and Glu327, while (E)-nerolidol hydrogen bonded with Asn75 and Lys71 (Figure 3). Unfortunately, the docking scores for these ligands as well as the scores of the other essential oil components with this protein are too low for it to be considered a viable target (see Table 3).\nADP ribose phosphatase (ADRP) serves to convert ADP-ribose 1″-monophosphate (Appr-1″-p) to ADP-ribose (Appr), which serves to regulate virus replication [110]. This enzyme may be dispensable in SARS-CoV-2, however [111]. Nevertheless, (E,E)-farnesol showed the most exothermic docking to SARS-CoV-2 ADRP with DSnorm = −121.4 kJ/mol. The binding site in SARS-CoV-2 ADRP is surrounded by Phe132, Asn40, Ile131, Ala38, and Ala39, with hydrogen-bonded interactions between the ligand alcohol and Asn40 (Figure 4). Additional essential oil components with good docking scores with SARS-CoV-2 ADRP include the sesquiterpene hydrocarbons (E)-β-farnesene (DSnorm = −116.3 kJ/mol), (E,E)-α-farnesene (DSnorm = −114.2 kJ/mol), β-sesquiphellandrene (DSnorm = −115.7 kJ/mol), and α-zingiberene (DSnorm = −115.4 kJ/mol); the diterpenoids phytol (DSnorm = −118.9 kJ/mol) and phytone (DSnorm = −116.9 kJ/mol); and the phenylpropanoid eugenyl acetate (DSnorm = −115.4 kJ/mol). Not surprisingly, β-sesquiphellandrene and α-zingiberene adopted the same docking orientation in the binding site of the enzyme (Figure 5A). Similarly, phytol and phytone occupy the same location in the binding site (Figure 5B).\nRNA-dependent RNA polymerase catalyzes RNA replication from an RNA template and is an essential enzyme in RNA viruses. Because these enzymes are crucial in viral replication, they are viable targets in antiviral chemotherapy [112]. Molecular docking of essential oil components with SARS-CoV-2 RdRp showed only weak docking with this enzyme target (Table 3). The ligand with the best docking score was (E,E)-farnesol, with DSnorm = −89.6 kJ/mol.\nThe SARS-CoV-2 spike protein serves to attach to angiotensin-converting enzyme 2 (ACE2) of the human cell to be invaded. The interface between SARS-CoV-2 rS and human ACE2 would be a promising target to prevent binding of SARS-CoV-2 rS to human ACE2 [113,114]. The best docking ligands with human ACE2, i.e., normalized docking scores \u003c -100 kJ/mol (α-bulnesene, eremanthin, (E,E)-α-farnesene, (E)-β-farnesene, (E,E)-farnesol, (E)-nerolidol, β-sesquiphellandrene, and (Z)-spiroether), all show docking preference to a cavity removed from the interaction interface between the SARS-CoV-2 spike protein and ACE2 (Figure 6). This cavity is a pocket surrounded by residues Pro565, Leu95, Val209, Asn210, Leu91, Lys94, Glu208, and Glu564. Because of the remote location of docking with ACE2, it is predicted that interaction of essential oil components with ACE2 will not prevent protein–protein interaction between the SARS-CoV-2 spike protein and human ACE2.\nOn the other hand, the lowest energy poses of essential oil components showing the strongest docking (\u003c−80 kJ/mol; (E)-cinnamyl acetate, eremanthin, (E,E)-α-farnesene, (E)-β-farnesene, (E,E)-farnesol, and geranyl formate) with the binding domain of the SARS-CoV-2 spike protein do lie at the interface between the SARS-CoV-2 spike protein and human ACE2 (Figure 6). This docking site is a hydrophobic pocket formed by Tyr505, Tyr495, Asn501, Arg403, Tyr453, and Gly502. Unfortunately, the docking energies at this site are too weak and are unlikely, therefore, to disrupt binding between SARS-CoV-2 rS and human ACE2.\nIn order to compare docking scores of the essential oil components with other proteins, docking was also carried out with six randomly selected non-virus proteins: Bovine odorant binding protein (BtOBP, PDB: 1GT3), cruzain (PDB: 1ME3), torpedo acetylcholinesterase (TcAChE, PDB: 6G1U), Bacillus anthracis nicotinate mononucleotide adenylytransferase (BaNadD, PDB: 3HFJ), Russell’s viper phospholipase A2 (DrPLA2, PDB: 1FV0), and Escherichia coli l-aspartate aminotransferase (EcAspTA, PDB: 2Q7W). Docking scores for these proteins are summarized in Table 4.\nThe docking results of the essential oil components with the six randomly selected proteins indicate the best docking ligands to SARS-CoV-2 targets (i.e., (E,E)-α-farnesene, (E)-β-farnesene, and (E,E)-farnesol) have better docking energies with other proteins. These three sesquiterpenes have docking energies of −129.8, −122.7, and −133.0 kJ/mol with TcAChE, respectively, and −131.8, −131.8, and −135.6 kJ/mol, respectively, with BaNadD. Indeed, most of the essential oil ligands have better docking properties with one or more of the random proteins compared to the SARS-CoV-2 proteins.\nBased on the docking energies of essential oil components with key protein targets of SARS-CoV-2, the individual essential oil components cannot be considered viable chemotherapeutic agents for interaction with the SARS-CoV-2 target proteins. However, essential oils are complex mixtures of compounds and several essential oil components may act synergistically to inhibit the virus. Astani and co-workers have shown, for example, that the antiviral activity (HSV-1) of Eucalyptus oil is much greater than the major component 1,8-cineole, and that tea tree oil has a greater antiviral activity than its components terpinen-4-ol, γ-terpinene, and α-terpinene [52].\nSynergistic effects have also been observed between essential oils and synthetic antiviral agents. Civitelli and co-workers observed an antiviral synergism between Mentha suaveolens essential oil and acyclovir on HSV-1 [64]. Likewise, Melissa officinalis essential oil potentiated the activity of oseltamivir against avian influenza virus H9N2 [115]. Furthermore, essential oils are lipophilic and therefore may also serve to disintegrate viral membranes [116].\nOutside of antiviral activity, there may be some relief of symptoms of COVID-19 provided by essential oils. For example, linalool [117,118], β-caryophyllene [119,120], and 1,8-cineole [121,122] have both anti-inflammatory and antinociceptive activity; menthol [123,124], camphor [125,126], and thymol [127] have antitussive activities.\n\n3. Materials and Methods\n\n3.1. Bibliographic Search Criteria\nThe bibliographic research was performed using the databases Google Scholar, Pubmed, Science Direct, Medline, and Scopus. The keywords applied were “antiviral activity” and “essential oils”, “antiviral activity” and “volatile compounds”, and “essential oils” and “respiratory diseases”.\n\n3.2. Ligand Selection\nThe major components (\u003e5%) of essential oils and pure essential oil components that have been screened against human pathogenic viruses were selected. In the case where enantiomers are known to be natural products, both structures were selected. A total of 171 essential oil components were used in the virtual screening.\n\n3.3. Molecular Docking\nEach ligand structure was prepared using Spartan ’18 v. 1.4.4 (Wavefunction, Inc., Irvine, CA, USA). The lowest-energy conformations of the ligands were determined and used as starting structures in the molecular docking. This is particularly important to include all potential conformations in medium-sized rings where interconversion between conformations may be hindered (e.g., bicyclogermacrene, costunolide, curdione, germacrene D, germacrone, and α-humulene). A total of six protein targets of SARS-CoV-2 from the Protein Data Bank (PDB), represented by a total of 17 structures, were used in the molecular docking, including SARS-CoV-2 main protease (PDB: 5R7Z, 5R80, 5R81, 5R82, 5R83, 5R84, 6LU7, 6M03, and 6Y84), SARS-CoV-2 endoribonuclease (PDB: 6VWW), SARS-CoV-2 ADP ribose phosphatase (PDB: 6W01 and 6W02), SARS-CoV-2 RNA-dependent RNA polymerase (PDB: 6M71), SARS-CoV-2 spike protein binding domain (PDB: 6M0J, 6VX1, 6VW1, and 6M17), and the human angiotensin-converting enzyme (PDB: 6M0J, 6VX1, 6VW1, and 6M17). Molecular docking was carried out using Molegro Virtual Docker v. 6.0.1 (Aarhus, Denmark) as previously reported [128,129]. Briefly, a 15-Å radius sphere centered on the binding sites of each protein structure in order to permit each ligand to search. In the case of the spike protein and human ACE2, the docking sphere was located at the interface between the spike protein and ACE2. In one case, ACE2 was removed and docking was carried out with the spike protein, and in the other case, the spike protein was removed and docking was carried out with ACE2. Standard protonation states of each protein, based on neutral pH, were used, and charges were assigned based on standard templates as part of the Molegro Virtual Docker program. Each protein was used as a rigid model without protein relaxation. Flexible-ligand models were used in the docking optimizations. Different orientations of the ligands were searched and ranked based on their “rerank” energy scores. A minimum of 100 runs for each ligand was carried out. In analyzing the docking scores, we accounted for the recognized bias due to molecular weight [130,131,132] using the scheme: DSnorm = 7.2 × Edock/MW⅓, where DSnorm is the normalized docking score, Edock is the MolDock re-rank score, MW is the molecular weight, and 7.2 is a scaling constant to ensure the average DSnorm values are comparable to those of Edock [128]. The best docking results are summarized in Table 1.\n\n4. Conclusions\nA molecular docking analysis was carried out using 171 essential oil components with the SARS-CoV-2 main protease (SARS-CoV-2 Mpro), SARS-CoV-2 endoribonucleoase (SARS-CoV-2 Nsp15/NendoU), SARS-CoV-2 ADP-ribose-1″-phosphatase (SARS-CoV-2 ADRP), SARS-CoV-2 RNA-dependent RNA polymerase (SARS-CoV-2 RdRp), the binding domain of the SARS-CoV-2 spike protein (SARS-CoV-2 rS), and human angiotensin-converting enzyme (hACE2). The best docking ligands for the SARS-CoV target proteins were (E,E)-α-farnesene, (E)-β-farnesene, and (E,E)-farnesol. The docking energies were relatively weak, however, and are unlikely to interact with the virus targets. However, essential oil components may act synergistically, essential oils may potentiate other antiviral agents, or they may provide some relief of COVID-19 symptoms.\n\nAcknowledgments\nW.N.S. participated in this work as part of the activities of the Aromatic Plant Research Center 237 (APRC, https://aromaticplant.org/).\n\nAuthor Contributions\nConceptualization, J.K.R.d.S., K.G.B., and W.N.S.; methodology, J.K.R.d.S., K.G.B., and W.N.S.; formal analysis, W.N.S.; investigation, J.K.R.d.S., P.L.B.F., K.G.B., and W.N.S.; data curation, W.N.S.; writing—original draft preparation, J.K.R.d.S. and W.N.S.; writing—review and editing, J.K.R.d.S., P.L.B.F., K.G.B., and W.N.S.; project administration, W.N.S.; All authors have read and agreed to the published version of the manuscript.\n\nFunding\nThis research received no external funding.\n\nConflicts of Interest\nThe authors declare no conflict of interest. Abbreviations\nAdeno Adenovirus\nAIV Avian influenza virus\nBaNadD Bacillus anthracis nicotinate mononucleotide adenylytransferase\nBtOBP Bovine odorant binding protein\nCOVID-19 Coronavirus disease 2019\nCox B1 Coxsackie B1 virus\nDENV-1 Dengue virus serotype 1\nDENV-2 Dengue virus serotype 2\nDENV-3 Dengue virus serotype 3\nDENV-4 Dengue virus serotype 4\nDrPLA2 Russell’s viper phospholipase A2\nDSnorm Normalized docking score\nEcAspTA Esherichia coli L-aspartate aminotransferase\nECHO 9 Echovirus 9\nhACE2 Human angiotensin-converting enzyme\nHeLa Human cervical tumor cells\nHEp-2 Human epithelial type 2 cells\nHRSV Human respiratory syncytial virus\nHSV-1 Herpes simplex virus 1\nHSV-2 Herpes simplex virus 2\nIC50 Median inhibitory concentration\nJUNV Junin virus\nMDCK Madin-Darby canine kidney cells\nMTT 3-(4,5-dimethylthiazol-2-yl)-2,5-diphenyltetrazolium bromide\nPCR Polymerase chain reaction\nPDB Protein data bank\nPolio 1 Poliomyelitis virus 1\nRC-37 African green monkey kidney cells\nSARS-CoV-2 2019 severe acute respiratory syndrome coronavirus 2\nTcAChE Torpedo acetylcholinesterase\nVero African green monkey kidney cells\nYFV Yellow fever virus\n\nFigure 1 Lowest-energy docked poses of (E)-β-farnesene and (E,E)-α-farnesene with the SARS-CoV-2 main protease (PDB: 6LU7). (A) Ribbon structure of the enzyme and (E)-β-farnesene. (B) Solid structure of the enzyme showing (E)-β-farnesene in the binding cleft. (C) Amino acid residues in proximity to the docked (E)-β-farnesene. (D) Lowest-energy docked pose of (E,E)-α-farnesene in the enzyme binding site.\nFigure 2 Lowest-energy docked poses of (E,E)-farnesol and (E)-nerolidol with the SARS-CoV-2 main protease (PDB: 6Y84). (A) Ribbon structure of the enzyme and (E,E)-farnesol (magenta) and (E)-nerolidol (orange). (B) Solid structure of the enzyme showing (E,E)-farnesol (magenta) and (E)-nerolidol (orange) in the binding cleft. (C) Important interactions of amino acid residues with (E,E)-farnesol. (D) Important interactions of amino acid residues with (E)-nerolidol. Hydrogen bonds are indicated with blue dashed lines.\nFigure 3 Lowest-energy docked poses of (E,E)-α-farnesene, (E)-β-farnesene, (E,E)-farnesol, and (E)-nerolidol with SARS-CoV-2 endoribonuclease (PDB: 6VWW). (A) Ribbon structure of the enzyme and (E,E)-α-farnesene (green), (E)-β-farnesene (aqua), (E,E)-farnesol (magenta), and (E)-nerolidol (orange). (B) Solid structure of the enzyme showing (E,E)-α-farnesene (green), (E)-β-farnesene (aqua), (E,E)-farnesol (magenta), and (E)-nerolidol (orange) in the binding cleft. (C) Lowest-energy docked pose of (E,E)-α-farnesene in the binding site. (D) Lowest-energy docked pose of (E)-β-farnesene in the binding site. (E) Lowest-energy docked pose of (E,E)-farnesol in the binding site. (F) Lowest-energy docked pose of (E)-nerolidol in the binding site. Hydrogen bonds are indicated with blue dashed lines.\nFigure 4 Lowest-energy docked pose of (E,E)-farnesol with SARS-CoV-2 ADP ribose phosphatase (PDB: 6W02). (A) Ribbon structure of the enzyme and the docked ligand. (B) Solid structure of the enzyme showing (E,E)-farnesol in the binding cleft. (C) Amino acid residues in proximity to the docked (E,E)-farnesol (hydrogen bonds are indicated with blue dashed lines).\nFigure 5 Lowest-energy docked poses of β-sesquiphellandrene, α-zingiberene, phytol, and phytone with SARS-CoV-2 ADP ribose phosphatase (PDB: 6W02). (A) Ribbon structure of the enzyme with β-sesquiphellandrene (brown) and α-zingiberene (yellow). (B) Ribbon structure of the enzyme with phytol (green) and phytone (red).\nFigure 6 Lowest-energy docked ligands with the binding domain of SARS-CoV-2 spike protein and human angiotensin-converting enzyme 2 (ACE2) (PDB: 6M17).\nTable 1 Essential oils showing antiviral activity.\nEssential Oil Major Components Assay IC50 (μg/mL) Reference\nAloysia gratissima (Gillies \u0026 Hook.) Tronc. caryophyllene oxide (15.8%), guaiol (17.4%) a, chrysanthenyl acetate (5.6%), and limonene oxide (5.3%) Plaque reduction assay (Vero cells), HSV-1 65.0 [37]\nAloysia triphylla Royle α-thujone (22.9%), cis−carveol (17.5%), carvone (13.2%), and limonene (12.7%) Plaque reduction assay (Vero cells), HSV-1 \u003e250 [38]\nArtemisia arborescens L. camphor (35.7%), β-thujone (24.0%), and chamazulene (7.7%) Plaque reduction assay (Vero cells), HSV-1 25% inhibition at 100 μg/mL [39]\nArtemisia arborescens L. Artemisia arborescens L. β-thujone (45.0%), camphor (6.8%), and chamazulene (22.7%) c Plaque reduction assay (Vero cells), HSV-1, HSV-2 2.4, 4.1 [40]\nArtemisia douglasiana Besser α-thujone (68.3%) and β-thujone (7.5%) Plaque reduction assay (Vero cells), HSV-1 83 [37]\nArtemisia kermanensis Podlech (syn. Seriphidium kermanense (Podlech) K. Bremer \u0026 Humphries α-thujone (13.8%), camphor (10.2%), and β-thujone (6.2%) Plaque reduction assay (Vero cells), HSV-1 40 [41]\nArtemisia mendozana DC. camphor (22.4%), artemiseole (11.7%), artemisia alcohol (10.8%), and borneol (7.2%) Plaque reduction assay, DENV−2, JUNV and HSV-1 129.3, 178.6, and 153.7 [38]\nArtemisia princeps Pamp. borneol (12.1%), α-thujone (8.7%), τ−cadinol, (6.7%), and 1,8-cineole (6.2%) Plaque reduction assay, murine norovirus−1 64% inhibition at 0.01% [42]\nPlaque reduction assay, feline calicivirus−F9 48% inhibition at 0.1%\nArtemisia vulgaris L. α-thujone (38.1%), β-thujone (10.6%), and 1,8-cineole (8.8%) Virus yield assay (Vero cells), yellow fever virus (YFV) 100 μg/mL (100% inhibition) [43]\nAyapana triplinervis (Vahl) R.M. King \u0026 H. Rob. thymohydroquinone dimethyl ether Plaque reduction assay (A549 cells), Zika virus 38.0 [44]\nBuddleja cordobensis Griseb. caryophyllene oxide (32.1%), β-caryophyllene (16.5%), and α-copaene (8.5%) Plaque reduction assay, DENV−2, JUNV and HSV-1 86.4, 39.0, and 54.1 [38]\nCedrus libani A. Rich. himachalol (22.5%), β-himachalene (21.9%), and α-himachalene (10.5%) Cytopathic effect (CPE) on Vero cells, HSV-1 440 [45]\nCinnamomum zeylanicum Blume (syn. Cinnamomum verum J. Presl) eugenol (75–85%), linalool (1.6−8.5%), (E)−cinnamaldehyde (0.6−1.5%), (E)−cinnamyl acetate (0.7–2.6%), β-caryophyllene (0.5–6.7%), eugenyl acetate (0.1–2.9%), and benzyl benzoate (0.1–8.3%) Influenza type A (H1N1) [46]\nCinnamomum zeylanicum Blume (syn. Cinnamomum verum J. Presl) (E)−cinnamaldehyde (63.9%), eugenol (7.0%), and (E)−cinnamyl acetate (5.1%) c Plaque reduction assay (HeLa cells), HSV-2 82 [47]\nCitrus × bergamia Risso \u0026 Poit. limonene (23–55%), linalool (2–37%), linalyl acetate (12–41%), β-pinene (up to 10%), and γ-terpinene (up to 10%) Influenza virus type A H1N1 100% inhibition at 0.3% [46]\nCitrus limonum Risso limonene (54.6%), γ-terpinene (19.1%), and β-pinene (14.5%) d Plaque reduction assay (Vero cells), HSV-1 2500 [48]\nCitrus reshni Hort ex Tan. (leaf EO) sabinene (40.5%), linalool (23.3%), and terpinen-4-ol (8.3%) Plaque reduction assay, influenza A virus H5N1 19.4% inhibition at 0.1 μL/mL [36]\nCitrus reshni Hort ex Tan. (unripe fruit peel EO) limonene (82.4%) and linalool (7.2%) Plaque reduction assay, influenza A virus H5N1 61.5% inhibition at 1.5 μL/mL [36]\nCitrus reshni Hort ex Tan. (ripe fruit peel EO) limonene (91.6%) Plaque reduction assay, influenza A virus H5N1 50% inhibition at 1.5 μL/mL [36]\nCupressus sempervirens L. α-pinene (51.9%) and δ-3-carene (24.9%) c Plaque reduction assay (Vero cells), HSV-1 6600 [48]\nCymbopogon citratus (DC.) Stapf geranial (40.2%), neral (30.6%), and geraniol (6.7%) c Plaque reduction assay (Vero cells), HSV-1 91 [48]\nCymbopogon flexuosus (Nees) Will. Watson geranial (48–54%) and neral (29–33%) Influenza virus type A (H1N1) [46]\nCynanchum stauntonii (Decne.) Schltr. ex H. Lév. (2E,4E)-decadienal (23.0%), γ-nonalactone (4.2%), 5-pentyl-2(3H)−furanone (3.8%), and 3-isopropyl-1-pentanol (3.5%) Influenza type A (H1N1) 64 [46]\nDysphania ambrosioides (L.) Mosyakin \u0026 Clemants cis-ascaridole (60.7%) and m-cymene (22.2%) Plaque reduction assay, Coxsackie virus B4 21.75 [49]\nEucalyptus astringens (Maiden) Maiden 1,8-cineole (42.0%), α-pinene (22.0%), and trans−pinocarveol (7.0%) Vero cells, Coxsakie virus B3 13.0 [50]\nEucalyptus bicostata Maiden, Blakely \u0026 Simmonds 1,8-cineole (68.0%), globulol (5.4%), and trans−pinocarveol (4.6%) Vero cells, Coxsakie virus B3 13.6 [50]\nEucalyptus caesia Benth. 1,8-cineole (40.2%), p-cymene (14.1%), γ-terpinene (12.4%), α-pinene (7.7%), and terpinen-4-ol (5.6%) Plaque reduction assay (Vero cells), HSV-1 70 [41]\nEucalyptus camaldulensis Dehnh. α-terpinene (26.3%), α-terpineol (9.1%), and camphene (8.5%) e Plaque reduction assay, Rotavirus Wa strain 50% inhibition at 10% EO concentration [51]\nEucalyptus camaldulensis Dehnh. α-terpinene (26.3%), α-terpineol (9.1%), and camphene (8.5%) e Plaque reduction assay, Coxsackie virus B4 53.3% at 10% EO concentration [51]\nEucalyptus camaldulensis Dehnh. α-terpinene (26.3%), α-terpineol (9.1%), and camphene (8.5%) e Plaque reduction assay, HSV-1 90% at 10% EO concentration [51]\nEucalyptus camaldulensis Dehnh. α-terpinene (26.3%), α-terpineol (9.1%), and camphene (8.5%) e Plaque reduction assay, adenovirus type 7 0% at 10% EO concentration [51]\nEucalyptus cinereal F. Muell. ex Benth. 1,8-cineole (70.4%), α-pinene (4.5%), and limonene (3.7%) Vero cells, Coxsakie virus B3 13.0 [50]\nEucalyptus globulus Labill. 1,8-cineole (63.8%) and α-pinene (14.0%) f Plaque reduction assay (Vero cells), HSV-1 1700 [48]\nEucalyptus globulus Labill. 1,8-cineole (63.8%) and α-pinene (14.0%) f Plaque reduction assay (RC-37 cells), HSV-1 55.0 [52]\nEucalyptus lehmannii (Schauer) Benth. 1,8-cineole (59.6%), α-pinene (17.6%), and α-terpineol (8.7%) Vero cells, Coxsakie virus B3 11.5 [50]\nEucalyptus leucoxylon F. Muell. 1,8-cineole (59.2%), α-pinene (7.8%), and α-terpineol (4.3%) Vero cells, Coxsakie virus B3 8.1 [50]\nEucalyptus maidenii F. Muell. 1,8-cineole (57.8%), p-cymene (7.4%), and α-pinene (7.3%) Vero cells, Coxsakie virus B3 14.5 [50]\nEucalyptus odorata Behr cryptone (20.9%), p-cymene (16.7%), phellandral (6.6%), and cuminal (6.6%) Vero cells, Coxsakie virus B3 19.2 [50]\nEucalyptus sideroxylon A. Cunn. ex Woolls 1,8-cineole (69.2%), α-pinene (6.9%), and α-terpineol (5.4%) Vero cells, Coxsakie virus B3 12.3 [50]\nEupatorium patens D. Don ex Hook. \u0026 Arn. germacrene D (36.2%), β-caryophyllene (14.1%), and bicyclogermacrene (7.0%) Plaque reduction assay (Vero cells), HSV-1 125 [37]\nFortunella margarita (Lour.) Swingle (leaf EO) α-terpineol (55.5%), carvone (5.7%), carveol (5.5%), γ-muurolene (5.5%), and citronellal (5.0%) MTT assay, reasserted avian influenza A virus, H5N1 6.77 [53]\nFortunella margarita (Lour.) Swingle (fruit EO) β-eudesmol (28.3%), α-muurolene (10.3%), β-gurjunene (10.0%), γ-eudesmol (8.4%), and γ-muurolene (6.6%) MTT assay, reasserted avian influenza A virus, H5N1 38.89 [53]\nGaillardia megapotamica (Spreng.) Baker β-pinene (24.2%), (Z)-β-ocimene (16.5%), α-pinene (7.7%), limonene (7.5%), and β-caryophyllene (6.7%) Plaque reduction assay, DENV−2, JUNV and HSV-1 140.6, 49.8, and 99.1 [38]\nHeterothalamus alienus (Spreng.) Kuntze β-pinene (35.5%), spathulenol (10.7%), and germacrene D (6.8%) Plaque reduction assay DENV−2, JUNV and HSV-1 122.3, 44.2 and 148.4 [38]\nHeterotheca latifolia Buckley borneol (40.0%), camphor (24.3%), and limonene (5.1%) Plaque reduction assay (Vero cells), HSV-1 \u003e150 [37]\nHouttuynia cordata Thunb. decanal (3.4−8.9%), decanol (up to 7.0%), 2−undecanone (23.0−36.1%), decanoic acid (1.4−6.3%), dodecanal (up to 7.3%), and 2−tridecanone (2.6−5.6%) Influenza type A (H1N1) 48 [54]\nHyptis mutabilis (Rich.) Briq. fenchone (17.1%), 1,8-cineole (12.6%), β-caryophyllene (10.9%), bicyclogermacrene (8.7%), and germacrene D (6.2%) Plaque reduction assay (Vero cells), HSV-2 (Human Herpesvirus type 1) 79.01 [55]\nHyptis mutabilis (Rich.) Briq. germacrene D (15.1%), β-caryophyllene (13.3%), curzerene (13.3%), and bicyclogermacrene (13.2%) Plaque reduction assay (Vero cells) \u003e150 [37]\nHyssopus officinalis L. cis−pinocamphone (40.1%), trans−pinocamphone (13.3%), β-pinene (10.7%), and β-phellandrene (5.3%) c Plaque reduction assay (RC-37 cells), HSV-1 1 [56]\nHyssopus officinalis L. cis−pinocamphone (40.1%), trans−pinocamphone (13.3%), β-pinene (10.7%), and β-phellandrene (5.3%) c Plaque reduction assay (RC-37 cells), HSV-2 6 [57]\nIllicium verum Hook. f. (E)−anethole (90.5%) c Plaque reduction assay (RC-37 cells), HSV-1 40 [58]\nIllicium verum Hook. f. (E)−anethole (90.5%) c Plaque reduction assay (RC-37 cells), HSV-1 1 [59]\nIllicium verum Hook. f. (E)−anethole (90.5%) c Plaque reduction assay (RC-37 cells), HSV-2 30 [57]\nJungia polita Griseb. caryophyllene oxide (9.2%) and β-caryophyllene (8.1%) Plaque reduction assay DENV−2, JUNV and HSV-1 39.8, 134.2 and 136.4 [38]\nJuniperus communis L. α-pinene (46.7%), myrcene (15.0%), sabinene (13.2%), and limonene (7.0%) c Plaque reduction assay (Vero cells), HSV-1 \u003e10000 [48]\nLavandula angustifolia Mill. linalyl acetate (37.0−43.6%), linalool (19.7−39.1%), geraniol (up to 9.3%), β-caryophyllene (up to 5.1%), terpinene−4−ol (up to 14.9%), lavandulol (up to 1.5%), lavandulyl acetate (up to 5.5%), 1,8-cineole (up to 4.1%), and borneol (up to 6.4%) 85% in vitro inhibition of influenza type A (H1N1) [46]\nLavandula latifolia Medik. linalool (31.9%), 1,8-cineole (18.8%), and borneol (10.1%) g Plaque reduction assay (Vero cells), HSV-1 2200 [48]\nLepechinia salviifolia (Kunth) Epling camphor (10.3%), limonene (9.7%), p−mentha−1(7),8−diene (7.4%), α-pinene (6.9%), and γ-terpinene (6.7%) Plaque reduction assay (Vero cells), HSV-1, HSV-2 68.8, 81.9 [55]\nLepechinia vulcanicola J.R.I. Wood limonene (18.9%), germacrene D (10.4%), 1−octen−3−ol (8.8%), β-caryophyllene (8.7%), and α-pinene (8.2%) Plaque reduction assay (Vero cells), HSV-1, HSV-2 112, 68.9 [55]\nLeptospermum scoparium J.R. Forst. \u0026 G. Forst. calamene (16.0%), leptospermone (14.5%), δ−cadinene (6.1%), flavesone (4.5%), viridiflorene (4.4%), and isoleptospermone (3.9%) Plaque reduction assay (RC-37 cells), HSV-1, HSV-2 0.96, 0.58 [60]\nLippia alba (Mill.) N.E. Br. ex Britton \u0026 P. Wilson carvone (51.0%), Limonene (33%), and bicyclosesquiphellandrene (7.0%) Virus yield assay (Vero cells), yellow fever virus (YFV) 100 μg/mL (100% inhibition) [43]\nLippia alba (Mill.) N.E. Br. ex Britton \u0026 P. Wilson carvone (39.7%), limonene (30.6%), and bicyclosesquiphellandrene (8.9%) Plaque reduction assay (Vero cells), DENV−1, DENV−2, DENV−3, DENV−4, YFV 17 DD 10.1, 0.4, 32.6, 21.1, 4.9 [61]\nLippia alba (Mill.) N.E. Br. ex Britton \u0026 P. Wilson carvone (39.7%), limonene (30.6%), and bicyclosesquiphellandrene (8.9%) Plaque reduction assay (Vero cells), Yellow fever (YFV) 4.3 [62]\nLippia citriodora Kunth (syn. Aloysia citriodora Palau) geranial (18.9%), neral (15.6%), limonene (10.7%), and 1,8-cineole (5.0) Plaque reduction assay (Vero cells), DENV−1, DENV−2, DENV−3, DENV−4, YFV 17 DD 1.9, 2.9, 2.6, 33.7, 5.7 [61]\nLippia citriodora Kunth (syn. Aloysia citriodora Palau) geranial (18.9%), neral (15.6%), limonene (10.7%), and 1,8-cineole (5.0) Plaque reduction assay (Vero cells), Yellow fever (YFV) 19.4 [62]\nLippia graveolens Kunth carvacrol (56.8%), o−cymene (32.1%), and γ-terpinene (3.7%) h MTT assay (Mardin−Darby bovine kidney cells), HSV-1, ACVR−HSV-1 (acyclovir−resistant HSV-1), HRSV (human respiratory syncytial virus) 99.6, 55.9, 68.0 [63]\nLippia junelliana (Moldenke) Tronc. piperitenone oxide (= rotundifolone) (36.5%), limonene (23.1%), camphor (7.9%), and spathulenol (6.5%) Plaque reduction assay (Vero cells), HSV-1 \u003e150 [37]\nLippia origanoides carvacrol (44.0%), thymol (15.0%), and γ-terpinene (10.0%) Virus yield assay (Vero cells), yellow fever virus (YFV) 11.1 μg/mL (100% inhibition) [43]\nLippia turbinata Griseb. limonene (60.6%), piperitenone oxide (17.4%), and β-caryophyllene (6.4%) Plaque reduction assay (Vero cells), HSV-1 \u003e 150 [37]\nMatricaria recutita L. α-bisabolol oxide A (13.4–55.9%), α-bisabolol oxide B (8.4–25.1%), bisabolone oxide A (2.9–11.4%), cis−bicycloether (= (Z)−spiroether) (3.6–17.7%), and (E)-β-farnesene (1.9–10.4%) i Plaque reduction assay (RC-37 cells), HSV-1 0.3 [58]\nMatricaria recutita L. α-bisabolol oxide A (13.4–55.9%), α-bisabolol oxide B (8.4–25.1%), bisabolone oxide A (2.9−11.4%), cis−bicycloether (= (Z)−spiroether) (3.6–17.7%), and (E)-β-farnesene (1.9–10.4%) i Plaque reduction assay (RC-37 cells), HSV-2 1.5 [57]\nMelaleuca alternifolia Cheel terpinen-4-ol (36.71%), γ-terpinene (22.20%), and α-terpinene (10.10%) Plaque reduction assay, influenza A⁄PR ⁄ 8 virus subtype H1N1 60 [31]\nMelaleuca alternifolia Cheel terpinen-4-ol (30–48%), γ-terpinene (10–28%), α-terpinene (5–13%), 1,8-cineole (up to 15%), terpinolene (1.5−5%), p-cymene (0.5–12%), α-pinene (1–6%), and α-terpineol (1.5–8%) 100% inhibition of influenza type A (H1N1) virus at 0.01%; type A (H11N9) virus to tea tree oil vapor caused 100% inhibition [46]\nMelaleuca alternifolia Cheel terpinen-4-ol (47.5%), γ-terpinene (20.2%), and α-terpinene (8.6%) c Plaque reduction assay (Vero cells), HSV-1 2700 [48]\nMelaleuca alternifolia Cheel terpinen-4-ol (47.5%), γ-terpinene (20.2%), and α-terpinene (8.6%) c Plaque reduction assay (Vero cells), HSV-1 13.2 [64]\nMelaleuca alternifolia Cheel terpinen-4-ol (47.5%), γ-terpinene (20.2%), and α-terpinene (8.6%) c Plaque reduction assay (RC-37 cells), HSV-1 2 [52]\nMelaleuca alternifolia Cheel terpinen-4-ol (47.5%), γ-terpinene (20.2%), and α-terpinene (8.6%) c Plaque reduction assay (HeLa cells), HSV-2 2700 [47]\nMelaleuca alternifolia Cheel terpinen-4-ol (47.5%), γ-terpinene (20.2%), and α-terpinene (8.6%) c Plaque reduction assay (Vero cells), HSV-1 significant plaque reduction at 10 and 5% v/v [65]\nMelaleuca armillaris (Sol. ex Gaertn.) Sm. 1,8-cineole (33.9%), terpinen-4-ol (18.8%), and γ-terpinene (10.4%) Plaque reduction assay (Vero cells), HSV-1 99% plaque reduction (concentration not given) [66]\nMelaleuca ericifolia Sm. methyl eugenol (96.84%) Plaque reduction assay (Vero cells), HSV-1 91.5% plaque reduction (concentration not given) [66]\nMelaleuca leucadendra (L.) L. 1,8-cineole (64.3%), α-terpineol (11.0%), and valencene (3.91%) Plaque reduction assay (Vero cells), HSV-1 92% plaque reduction (concentration not given) [66]\nMelissa officinalis L. neral (17−32%), geranial (23–43%), linalool (up to 9.0%), citronellal (0.7–20.3%), geraniol (up to 23.2%), β-caryophyllene (up to 11.3%), and caryophyllene oxide (0.4−31.7%) influenza A virus (H9N2) Significant reduction at 5 μg/mL [46]\nMelissa officinalis L. β-cubebene (15.4%), β-caryophyllene (14.2%), α-cadinol (7.2%), geranial (6.6%), and neral (5.8%) Plaque reduction assay (HEp−2 cells), HSV-2 21 [67]\nMelissa officinalis L. geranial (20.1%), β-caryophyllene (17.3%), and neral (13.6%) Plaque reduction assay (RC-37 cells), HSV-1, HSV-2 4, 0.8 [68]\nMentha × piperita L. menthol (42.8%), menthone (14.6%), and isomenthone (5.9%) Plaque reduction assay (RC-37 cells), HSV-1, HSV-2 20, 8 [69]\nMentha × piperita L. menthol (43.8%), menthone (19.7%), menthyl acetate (6.5%), and 1,8-cineole (5.0%) c Plaque reduction assay (Vero cells), HSV-1 2200 [48]\nMentha suaveolens Ehrh. limonene (7.4%), isopulegol (12.0%), and piperitenone oxide (41.8%) Plaque reduction assay, cytopathogenic murine norovirus 0.87 [70]\nMentha suaveolens Ehrh. piperitenone oxide (86.9%) Plaque reduction assay (Vero cells), HSV-1 5.1 [64]\nMinthostachys mollis Griseb. cis−piperitone epoxide (29.9%), piperitenone oxide (25.6%), menthone (7.4%), germacrene D (5.8%), and pulegone (5.5%) Plaque reduction assay (Vero cells), HSV-1, HSV-2 70.7, 68.0 [55]\nOcimum basilicum var. album (L.) Benth. linalool (53.8%) and eugenol (12.6%) j Plaque reduction assay (Vero cells), HSV-1 \u003e10000 [48]\nOcimum campechianum Mill. methyl eugenol (53.9%), β-caryophyllene (13.0%), α-bulnesene (5.4%), germacrene D (3.4%), and α-humulene (3.3%) Plaque reduction assay (Vero cells), HSV-2 74.33 [55]\nOriganum elongatum Emb. (leaf EO) p-cymene (16.2%), γ-terpinene (13.5%), thymol (14.2%), and carvacrol (19.2%) Plaque reduction assay, cytopathogenic murine norovirus 0.37 [70]\nOriganum elongatum Emb. (inflorescence EO) p-cymene (16.1%), γ-terpinene (7.3%), and carvacrol (40.1%), Plaque reduction assay, cytopathogenic murine norovirus 0.75 [70]\nOriganum majorana L. terpinen-4-ol (28.9%), γ-terpinene (14.9%), trans−sabinene hydrate (9.5%), α-terpinene (8.7%), and sabinene (7.2%) c Plaque reduction assay (Vero cells), HSV-1 2800 [48]\nOriganum majorana L. terpinen-4-ol (28.9%), γ-terpinene (14.9%), trans−sabinene hydrate (9.5%), α-terpinene (8.7%), and sabinene (7.2%) c Plaque reduction assay (HeLa cells), HSV-2 520 [47]\nOriganum vulgare L. trans−sabinene hydrate (21.0%), thymol (11.0%), and carvacrol methyl ether (11.0%) Virus yield assay (Vero cells), yellow fever virus (YFV) 100 μg/mL (100% inhibition) [43]\nOsmunda regalis L. hexahydrofarnesyl acetone ( = phytone) (11.8%), 2,4−di−t−butylphenol (6.8%), phytol (6.5%), hexadecene (4.1%), and octadecene (4.4%) Plaque reduction assay, Coxsackie virus B4 type 2 2.24 [71]\nPectis odorata Griseb. limonene (50.2%), neral (27.2%), and geranial (23.6%) Plaque reduction assay DENV−2, JUNV and HSV-1 39.6, 36.6, and 71.5 [38]\nPelargonium graveolens L’Hér. ex Aiton citronellol (21.9–37.5%), citronellyl formate (9.8–20.6%), geraniol (6.0–16.5%), geranyl formate (1.5–6.5%), menthone (up to 13%), isomenthone (up to 9.9%), and linalool (0.8−14.9%) influenza type A (H1N1) 95% inhibition at 0.3% [46]\nPinus mugo Turra δ-3-carene (23.9%), α-pinene (17.9%), β-pinene (7.8%), and β-phellandrene (7.2%) k Plaque reduction assay (RC-37 cells), HSV-1 7 [58]\nRavensara aromatica Sonn. (syn. Cryptocarya agathophylla van der Werff) 1,8-cineole (52.6%), α-terpineol (12.4%), and sabinene (11.0%) l Plaque reduction assay (Vero cells), HSV-1 2800 [48]\nRosmarinus officinalis L. α-pinene (23.9%), verbenone (15.4%), camphor (11.0%), camphene (8.7%), p-cymene (7.5%), and 3−octanone (5.6%) Plaque reduction assay (Vero cells), HSV-1 60 [41]\nRosmarinus officinalis L. 1,8-cineole (45.9%), α-pinene (12.0%), camphor (10.9%), and β-pinene (6.3%) b Plaque reduction assay (Vero cells), HSV-1 2700 [48]\nSalvia fruticosa Mill. 1,8-cineole (47.5%), camphor (9.0%), β-thujone (7.6%), and α-thujone (4.3%) Plaque reduction assay (Vero cells), HSV-1 and HSV-2 1300 [72]\nSantalum album L. (Z)−α-santalol (45.2%), (Z)-β-santalol (25.4%), and (Z)−trans−α-bergamotol (7.8%) c Plaque reduction assay (Vero cells), HSV-1, HSV-2 22.7, 45.3 [73]\nSantalum album L. (Z)−α-santalol (45.2%), (Z)-β-santalol (25.4%), and (Z)−trans−α-bergamotol (7.8%) c Plaque reduction assay (RC-37 cells), HSV-1 2 [56]\nSantalum album L. (Z)−α-santalol (45.2%), (Z)-β-santalol (25.4%), and (Z)−trans−α-bergamotol (7.8%) c Plaque reduction assay (RC-37 cells), HSV-2 5 [57]\nSantolina insularis (Gennari ex Fiori) Arrigoni artemisia ketone (21.2%), allo−aromadendrene (12.7%), 1,8-cineole (9.0%), and camphene (8.5%) m Plaque reduction assay (Vero cells), HSV-1 and HSV-2 0.88, 0.7 [74]\nSatureja hortensis L. carvacrol (32.4%), γ-terpinene (32.0%), thymol (10.0%), and p-cymene (6.6%) Plaque reduction assay (Vero cells), HSV-1 80 [41]\nTessaria absinthioides (Hook. \u0026 Arn.) DC. caryophyllene oxide (12.2%), (E)-β-damascenone, γ-eudesmol (8.5%), α-gurjunene (5.8%), and terpinen-4-ol (5.4%) Plaque reduction assay (Vero cells), HSV-1 105 [37]\nThymus capitatus (L.) Hoffmanns. \u0026 Link (unripe fruit EO) carvacrol (68.6%), p-cymene (4.8%), γ-terpinene (3.0%), and β-caryophyllene (2.9%) Plaque reduction assay, cytopathogenic murine norovirus 0.49 [70]\nThymus capitatus (L.) Hoffmanns. \u0026 Link (ripe fruit EO) carvacrol (58.8%), p-cymene (5.6%), γ-terpinene (2.8%), and β-caryophyllene (2.6%) Plaque reduction assay, cytopathogenic murine norovirus 0.50 [70]\nThymus vulgaris L. thymol (31–50%), p-cymene (0.1–26.6%), and γ-terpinene (up to 22.8%) 100% inhibition of type A (H1N1) virus at 0.3% concentration [46]\nThymus vulgaris L. thymol (43.9%), carvacrol (14.4%), p-cymene (10.5%), β-caryophyllene (7.0%), and γ-terpinene (5.1%) c Plaque reduction assay (RC-37 cells), HSV-1 10 [56]\nThymus vulgaris L. thymol (43.9%), carvacrol (14.4%), p-cymene (10.5%), β-caryophyllene (7.0%), and γ-terpinene (5.1%) c Plaque reduction assay (RC-37 cells), HSV-1 11 [52]\nThymus vulgaris L. thymol (43.9%), carvacrol (14.4%), p-cymene (10.5%), β-caryophyllene (7.0%), and γ-terpinene (5.1%) c Plaque reduction assay (RC-37 cells), HSV-2 7 [57]\nThymus willdenowii Boiss. 1,8-cineole (34.62%), camphor (18.55%), α-pinene (9.46%), and camphene (5.38%) Plaque reduction assay, Coxsackie virus Inactive [75]\nTrachyspermum ammi (L.) Sprague thymol (35–60%), α-pinene, p-cymene, and limonene Plaque reduction assay, Japanese encephalitis virus 80% reduction at 500 μg/mL [76]\nZataria multiflora Boiss. thymol (47.3%), carvacrol (21.9%), p-cymene (8.6%), γ-terpinene (4.2%), and β-caryophyllene (3.0%) Real time PCR (H9N2 subtype of AIV) Reduced viral replication in trachea of broiler chickens [77]\nZataria multiflora Boiss. thymol (33.1%), carvacrol (25.9%), and p-cymene (11.3%) Plaque reduction assay (Vero cells), HSV-1 30 [41]\nZingiber officinale Roscoe α-zingiberene (32.1%), ar−curcumene (15.2%), β-sesquiphellandrene (10.9%), α-farnesene (7.2%), and α-phellandrene (4.4%) Plaque reduction assay, Caprine alphaherpesvirus type I not determined [78]\nZingiber officinale Roscoe α-zingiberene (26.4%), camphene (12.6%), β-sesquiphellandrene (9.2%), ar−curcumene (6.5%), β-phellandrene (6.2%), and β-bisabolene (5.1%) c Plaque reduction assay (RC-37 cells), HSV-1 2 [56]\nZingiber officinale Roscoe α-zingiberene (26.4%), camphene (12.6%), β-sesquiphellandrene (9.2%), ar−curcumene (6.5%), β-phellandrene (6.2%), and β-bisabolene (5.1%) c Plaque reduction assay (RC-37 cells), HSV-2 1 [57]\na Reported as cadinol, but see [79,80]. b Essential oil composition not reported; essential oil composition obtained from [81]. c Essential oil composition not reported; essential oil composition of commercial (dōTERRA International, Pleasant Grove, Utah, USA). d Essential oil composition not reported; essential oil composition obtained from [82]. e Essential oil composition not reported; essential oil composition obtained from [83]. f Essential oil composition not reported; essential oil composition obtained from [84]. g Essential oil composition not reported; essential oil composition obtained from [85]. h Essential oil composition not reported; essential oil composition obtained from [86]. i Essential oil composition not reported; essential oil composition obtained from [87]. j Essential oil composition not reported; essential oil composition obtained from [88]. k Essential oil composition not reported; essential oil composition obtained from [89]. l Essential oil composition not reported; essential oil composition obtained from [90]. m Essential oil composition not reported; essential oil composition obtained from [91].\nTable 2 Antiviral activities of essential oil components.\nEssential Oil Component Assay IC50 (μg/mL) Reference\n(E)−Anethole Plaque reduction assay (RC-37 cells), HSV-1 20 [59]\nCamphor Plaque reduction assay (Vero cells), HSV-1 2600 [72]\nCarvacrol MTT assay (Mardin−Darby bovine kidney (MDBK) cells, HSV-1 48.6 [63]\nβ-Caryophyllene Plaque reduction assay (RC-37 cells), HSV-1 0.25 [59]\nCaryophyllene oxide Plaque reduction assay (RC-37 cells), HSV-1 0.7 [59]\n1,8-Cineole Plaque reduction assay (Vero cells), HSV-1 1800 [72]\n1,8-Cineole Plaque reduction assay (RC-37 cells), HSV-1 1200 [52]\n(E)-Cinnamaldehyde Influenza type A (H1N1) virus 70% at a concentration of 0.53% after 3 h [95]\n(E)-Cinnamaldehyde H1N1 in-vivo by inhalation in a mouse model 89% inhibition [95]\nCitral (Geranial + Neral) Yellow fever (YFV), Vero cells 17.6 [62]\nCitral (Geranial + Neral) Plaque reduction assay (RC-37 cells), HSV-1 3.50 [52]\np-Cymene Influenza, HSV-1, HSV-2, ECHO 9, Cox B1, Polio 1, Adeno 6 \u003e500 [31]\np-Cymene Plaque reduction assay (RC-37 cells), HSV-1 16 [52]\np-Cymene Influenza type A (H1N1) virus Inactive [25]\nDodecanal Influenza type A (H1N1) virus 51 [54]\nβ-Eudesmol Plaque reduction assay (Vero cells), HSV-1 6 [59]\nEugenol Plaque reduction assay (RC-37 cells), HSV-1 35 [59]\nEugenol Plaque reduction assay (RC-37 cells), HSV-1 25.6 [96]\nFarnesol Plaque reduction assay (RC-37 cells), HSV-1 3.5 [59]\nGermacrone Influenza type A (H1N1) virus 1.22–1.55 [97]\nGermacrone Influenza type A (H3N2) virus 0.34 [97]\nGermacrone Influenza type B virus 1.38 [97]\nIsoborneol Plaque reduction assay (Vero cells), HSV-1 \u003c1000 [98]\nNerolidol (natural) Plaque reduction assay (RC-37 cells), HSV-1 4.2 [99]\nNerolidol (synthetic) Plaque reduction assay (RC-37 cells), HSV-1 1.5 [99]\nOctanal Influenza type A (H1N1) virus 15 [54]\nPatchouli alcohol Influenza type A (H1N1) 89% inhibition at 10 μg/mL [100]\nPatchouli alcohol Influenza type A (H2N2) 0.89 [101]\nPatchouli alcohol Influenza type A (H2N2), in-vivo test using a mouse model 70% survival rate at a dose of 5 mg/(kg day) [101]\nα-Pinene Plaque reduction assay (RC-37 cells), HSV-1 4.5 [52]\nPiperitenone oxide Plaque reduction assay (Vero cells) 1.4 [64]\nα-Terpinene Influenza type A (H1N1) virus Inactive [25]\nα-Terpinene Influenza, HSV-1, HSV-2, ECHO 9, Cox B1, Polio 1, Adeno 4 \u003e12 [31]\nα-Terpinene Plaque reduction assay (RC-37 cells), HSV-1 8.5 [52]\nγ-Terpinene Plaque reduction assay (RC-37 cells), HSV-1 7 [52]\nγ-Terpinene Influenza, HSV-1, HSV-2, ECHO 9, Cox B1, Polio 1, Adeno 5 \u003e120 [31]\nγ-Terpinene influenza type A (H1N1) virus inactive [25]\nTerpinen-4-ol Influenza, HSV-1, HSV-2, ECHO 9, Cox B1, Polio 1, Adeno 2 25 (influenza)\u003e50 (others) [31]\nTerpinen-4-ol Plaque reduction assay (Vero cells), HSV-1 60 [52]\nα-Terpineol Plaque reduction assay (RC-37 cells), HSV-1 22 [52]\nTerpinolene Influenza, HSV-1, HSV-2, ECHO 9, Cox B1, Polio 1, Adeno 3 12 (influenza)\u003e12 (others) [31]\nThujones (α \u0026 β) Plaque reduction assay (RC-37 cells), HSV-1 400 [72]\nThymol Influenza type A (H1N1) virus Active [25]\nThymol Plaque reduction assay (RC-37 cells), HSV-1 30 [52]\n2-Undecanone influenza type A (H1N1) virus 62 [54]\nTable 3 Docking scores, normalized for molecular weight (DSnorm, kJ/mol), of essential oil components with severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) molecular targets.\nCompound MainProtease Endoribo-Nuclease ADP RibosePhosphatase RNA-DependentRNA Polymerase Spike ProteinBinding Domain Angiotensin-Converting Enzyme a\n(E)-Anethole −84.9 −83.0 −97.5 −74.0 −65.2 −83.8\nallo-Aromadendrene −86.6 −86.9 −95.8 −74.9 −66.1 −85.3\nArtemiseole −89.2 −83.4 −96.6 −73.0 −67.8 −78.0\n(R)-Artemisia alcohol −84.3 −78.3 −88.2 −66.8 −61.1 −74.7\n(S)-Artemisia alcohol −86.1 −85.4 −98.5 −69.5 −67.1 −77.4\nArtemisia ketone −91.0 −85.7 −97.9 −71.9 −66.9 −77.3\nAscaridole −74.8 −68.2 −86.0 −65.2 −62.6 −64.4\nBenzyl benzoate −104.9 −96.5 −110.3 −82.5 −74.9 −96.4\n(Z)-trans-α-Bergamotol −98.0 −91.2 −105.9 −71.9 −63.6 −83.6\nBicyclogermacrene −85.9 −88.0 −92.5 −75.6 −68.2 −86.1\nBicyclosesquiphellandrene −79.4 −89.6 −86.0 −61.8 −62.5 −78.2\nα-Bisabolol oxide A −88.5 −87.6 −89.1 −71.5 −63.5 −89.7\nα-Bisabolol oxide B −96.6 −92.2 −101.0 −79.7 −75.2 −95.6\nBisabolone oxide A −93.7 −87.9 −98.2 −73.3 −71.0 −78.7\n(+)-Borneol −77.4 −91.8 −100.1 −74.1 −70.9 −73.3\n(−)-Borneol −71.4 −71.5 −78.4 −56.7 −50.1 −73.7\n(+)-iso-Borneol −75.6 −75.3 −75.9 −60.8 −53.2 −71.8\n(−)-iso-Borneol −73.8 −69.2 −75.6 −54.8 −49.3 −72.4\nα-Bulnesene −95.2 −72.4 −78.4 −57.0 −57.8 −101.7\nδ-Cadinene −91.6 −90.2 −112.6 −75.2 −60.0 −93.4\nτ-Cadinol −92.3 −82.8 −82.5 −69.9 −69.8 −87.8\n(R)-Calamene −92.3 −83.5 −97.4 −69.0 −65.6 −87.3\n(S)-Calamene −88.4 −86.8 −95.9 −70.2 −64.7 −87.5\n(+)-Camphene −85.6 −78.9 −83.2 −64.4 −57.9 −72.2\n(−)-Camphene −77.2 −74.1 −87.1 −66.0 −59.8 −67.1\n(+)-Camphor −75.2 −73.1 −77.9 −63.9 −53.8 −69.4\n(−)-Camphor −72.5 −70.0 −75.6 −64.3 −52.8 −70.8\n(+)-δ-3-Carene −87.9 −78.6 −87.0 −65.0 −72.4 −75.8\n(−)-δ-3-Carene −83.9 −88.0 −90.4 −66.8 −67.3 −73.4\nCarvacrol −84.5 −86.6 −94.8 −74.1 −71.0 −81.2\nCarvacrol methyl ether −85.5 −82.5 −103.1 −74.6 −65.8 −83.7\n(+)-cis−Carveol −87.0 −81.8 −97.7 −76.5 −69.7 −80.4\n(−)-cis−Carveol −85.6 −85.0 −95.6 −76.8 −74.3 −81.2\n(R)-Carvone −87.7 −82.4 −98.2 −74.7 −69.2 −83.4\n(S)-Carvone −86.2 −83.2 −98.9 −73.2 −66.3 −82.2\n(E)-Caryophyllene −81.2 −82.2 −93.9 −73.4 −59.2 −75.1\nCaryophyllene oxide −80.6 −86.7 −97.0 −74.1 −66.5 −83.3\nCedrol −82.3 −84.4 −80.1 −69.7 −58.3 −69.9\nepi-Cedrol −76.4 −88.4 −92.2 −68.5 −55.5 −75.9\nChamazulene −97.6 −96.4 −110.9 −76.9 −73.7 −95.6\n(−)-cis-Chrystanthyl acetate −83.2 −77.5 −87.1 −71.5 −60.2 −80.9\n(−)-trans−Chrysanthenyl acetate −77.0 −81.4 −85.3 −65.9 −68.9 −72.4\n1,8-Cineole −72.7 −67.6 −71.5 −58.1 −58.6 −61.0\n(E)-Cinnamaldehyde −93.1 −85.8 −100.0 −76.4 −73.1 −81.0\n(E)-Cinnamyl acetate −99.4 −88.0 −108.9 −76.9 −80.6 −89.5\n(R)-Citronellal −99.9 −91.6 −105.0 −75.1 −73.3 −88.0\n(S)-Citronellal −98.3 −88.9 −107.4 −72.1 −71.4 −86.2\n(R)-Citronellol −99.9 −90.2 −104.9 −75.7 −72.3 −84.9\n(S)-Citronellol −99.2 −92.2 −107.6 −74.2 −77.4 −85.1\n(R)-Citronellyl formate −105.5 −92.6 −109.9 −72.8 −76.2 −90.5\n(S)-Citronellyl formate −101.5 −96.4 −114.7 −81.9 −78.3 −91.0\nα-Copaene −84.1 −78.9 −85.9 −60.2 −59.6 −77.1\nCostunolide −94.5 −99.2 −110.2 −78.2 −74.9 −92.6\n(R)-Cryptone −86.6 −82.4 −93.5 −68.2 −70.4 −74.8\n(S)-Cryptone −81.5 −82.9 −94.9 −69.8 −70.6 −76.6\nβ-Cubebene −90.8 −92.0 −86.7 −76.0 −71.2 −89.8\nCuminaldehyde −86.2 −80.5 −103.3 −74.9 −67.5 −81.7\nar-Curcumene −105.3 −94.0 −108.6 −82.8 −75.8 −96.4\nCurcumol −83.0 −93.4 −91.2 −73.5 −69.6 −86.0\nCurdione −86.2 −98.1 −99.0 −77.3 −71.7 −92.0\nCurzerene −91.5 −86.0 −104.2 −76.8 −67.6 −90.5\nm-Cymene −83.6 −81.3 −92.8 −72.0 −67.6 −79.0\no-Cymene −83.2 −78.3 −87.7 −63.9 −63.3 −72.9\np-Cymene −79.7 −78.7 −91.0 −70.3 −63.9 −75.4\n(E)-β-Damascenone −85.2 −87.6 −110.2 −73.8 −73.8 −84.8\n(2E,4E)-Decadienal −105.7 −97.7 −112.5 −81.8 −78.7 −90.0\nDodecanal −102.8 −93.9 −101.9 −77.9 −73.3 −94.9\nEremanthin −97.7 −97.7 −98.0 −83.7 −81.3 −100.9\nβ-Eudesmol −97.6 −87.4 −106.5 −75.8 −64.5 −74.7\nγ-Eudesmol −93.6 −89.9 −94.7 −69.4 −66.1 −84.3\nEugenol −93.2 −91.7 −105.2 −80.0 −79.1 −88.4\nEugenol methyl ether −88.5 −85.3 −111.1 −71.7 −68.6 −89.3\nEugenyl acetate −96.3 −89.3 −115.1 −75.6 −70.6 −94.9\n(E,E)-α-Farnesene −115.0 −107.5 −112.8 −86.8 −85.3 −100.3\n(E)-β-Farnesene −115.4 −105.0 −116.3 −87.1 −82.9 −100.7\n(E,E)-Farnesol −112.4 −104.6 −121.4 −89.6 −80.8 −100.9\n(+)-Fenchone −80.0 −80.9 −87.1 −66.1 −60.8 −66.9\n(-)-Fenchone −83.3 −67.5 −86.2 −66.5 −60.9 −68.8\nFlavesone −82.3 −84.0 −95.7 −68.9 −64.4 −78.9\nGeranial −101.7 −90.8 −113.0 −76.1 −74.5 −92.0\nGeraniol −103.5 −98.5 −110.2 −77.4 −76.4 −93.8\nGeranyl formate −105.9 −93.9 −111.4 −80.8 −80.3 −96.2\nGermacrene D −92.1 −96.7 −110.5 −77.1 −73.0 −87.3\nGermacrone −85.1 −97.1 −94.9 −71.6 −67.1 −80.9\nGuiaol −94.1 −92.5 −113.4 −79.2 −79.4 −91.9\nα-Gurjunene −89.9 −83.2 −81.3 −71.5 −61.3 −79.8\nβ-Gurjunene −77.4 −64.1 −81.1 −64.1 −58.0 −75.1\nα-Himachalene −80.4 −89.7 −86.5 −63.7 −67.9 −74.3\nβ-Himachalene −85.5 −81.3 −88.6 −68.1 −62.9 −77.2\nHimachalol −77.2 −88.3 −100.8 −63.6 −63.7 −75.6\nα-Humulene −88.9 −90.9 −89.1 −74.9 −70.6 −86.7\nLeptospermone −85.5 −83.2 −92.9 −71.2 −64.1 −80.0\niso-Leptospermone −86.1 −82.7 −93.7 −69.1 −62.6 −83.5\n(R)-Limonene −82.2 −76.2 −92.0 −72.6 −67.3 −79.0\n(S)-Limonene −82.2 −73.8 −92.2 −72.4 −66.1 −77.5\n(R,S,R)-Limonene oxide −86.3 −77.7 −100.8 −76.7 −68.1 −85.1\n(S,R,R)-Limonene oxide −83.5 −87.4 −89.4 −66.7 −63.4 −76.4\n(S,R,S)-Limonene oxide −84.7 −80.7 −95.8 −74.9 −66.7 −83.8\n(R)-Linalool −96.0 −89.3 −101.4 −70.9 −79.0 −87.0\n(S)-Linalool −100.7 −87.5 −102.1 −71.4 −70.4 −87.8\n(R)-Linalyl acetate −101.4 −88.9 −105.1 −73.0 −74.3 −82.5\n(S)-Linalyl acetate −102.8 −90.8 −106.0 −68.5 −74.5 −82.3\np-Mentha-1(7),8-diene −82.3 −82.2 −94.3 −69.5 −65.9 −79.3\n(+)-Menthol −82.9 −86.2 −95.0 −71.8 −66.6 −77.7\n(-)-Menthol −82.3 −84.5 −95.1 −71.1 −69.2 −79.4\nMenthone −83.2 −77.8 −94.7 −69.3 −70.0 −74.4\niso-Menthone −81.0 −79.8 −97.6 −64.4 −63.5 −80.1\nα-Muurolene −86.9 −81.9 −96.9 −72.0 −66.0 −83.7\n(+)-γ-Muurolene −82.3 −82.9 −83.1 −72.2 −66.6 −84.4\n(-)-γ-Muurolene −88.4 −86.2 −106.7 −74.5 −68.5 −86.8\nMyrcene −98.7 −90.1 −102.2 −74.9 −71.4 −84.3\nNeral −102.6 −91.8 −110.5 −81.5 −72.4 −91.2\n(E)-Nerolidol −110.7 −101.4 −113.8 −83.5 −76.1 −100.6\n(E)-β-Ocimene −97.0 −90.2 −103.6 −76.3 −75.6 −86.7\n(Z)-β-Ocimene −98.3 −88.7 −103.2 −78.6 −73.9 −85.1\nOctanal −89.7 −83.8 −99.5 −71.3 −72.4 −80.5\n(R)-2-Octen-3-ol −88.1 −88.4 −96.6 −71.9 −70.7 −81.9\n(S)-1-Octen-3-ol −94.2 −90.7 −93.4 −77.1 −74.7 −80.0\n3-Octanone −88.9 −85.3 −94.7 −71.7 −72.9 −80.3\nPatchouli alcohol −63.5 −57.1 −66.7 −51.8 −43.0 −67.9\n(R)-Phellandral −87.6 −85.9 −102.5 −74.4 −66.2 −81.1\n(S)-Phellandral −87.7 −83.7 −101.6 −74.4 −66.5 −79.2\n(R)-α-Phellandrene −81.1 −82.9 −92.5 −70.1 −65.3 −76.4\n(S)-α-Phellandrene −81.6 −82.5 −92.3 −69.7 −65.6 −76.6\n(R)-β-Phellandrene −84.4 −83.7 −94.0 −69.8 −65.5 −75.2\n(S)-β-Phellandrene −82.9 −84.5 −94.0 −71.2 −67.5 −77.7\nPhytol −106.3 −94.2 −118.9 −74.9 −75.6 −93.3\nPhytone −106.4 −94.3 −116.9 −79.8 −72.3 −90.4\n(+)-α-Pinene −79.0 −70.7 −79.7 −59.4 −54.6 −63.7\n(-)-α-Pinene −77.3 −70.4 −72.9 −61.3 −54.7 −63.6\n(+)-β-Pinene −76.8 −71.8 −79.4 −63.7 −53.0 −65.2\n(-)-β-Pinene −78.8 −73.6 −73.9 −61.9 −56.1 −64.7\n(+)-Pinocamphone −74.9 −72.6 −79.4 −63.2 −62.4 −66.4\n(-)-Pinocamphone −73.2 −79.3 −81.8 −62.0 −61.4 −67.2\n(+)-iso-Pinocamphone −74.9 −75.0 −74.9 −66.6 −55.1 −66.5\n(-)-iso-Pinocamphone −77.1 −80.7 −77.5 −64.0 −55.6 −68.3\n(+)-cis-Pinocarveol −73.9 −78.1 −79.5 −67.7 −57.4 −70.2\n(-)-cis-Pinocarveol −74.1 −76.5 −78.8 −67.0 −58.6 −66.3\n(+)-trans-Pinocarveol −74.7 −80.5 −78.7 −65.8 −57.2 −70.6\n(-)-trans-Pinocarveol −77.6 −80.0 −82.6 −60.5 −55.5 −70.8\n(+)-Piperitone oxide −82.0 −81.5 −98.5 −66.2 −65.2 −77.8\n(-)-Piperitone oxide −81.6 −83.9 −94.9 −68.6 −60.8 −82.8\n(-)-iso-Pulegol −82.5 −85.1 −98.8 −75.2 −66.7 −79.3\n(R)-Pulegone −84.0 −83.1 −96.1 −66.4 −65.5 −78.3\n(S)-Pulegone −83.6 −78.6 −93.3 −67.2 −66.2 −78.9\nRotundifolone −83.1 −79.0 −96.6 −66.4 −62.1 −80.7\n(+)-Sabinene −86.4 −84.0 −92.2 −70.5 −68.6 −77.4\n(-)-Sabinene −87.8 −85.9 −94.7 −71.5 −69.6 −77.0\ncis-Sabinene hydrate −82.4 −81.1 −92.4 −68.0 −60.8 −78.2\n(Z)-α-Santalol −105.7 −95.3 −108.8 −84.7 −70.7 −95.8\n(E)-β-Santalol −104.8 −95.6 −106.2 −77.0 −70.9 −86.6\n(Z)-β-Santalol −104.4 −94.4 −106.2 −79.8 −73.2 −92.2\nβ-Sesquiphellandrene −103.8 −99.0 −115.7 −84.8 −75.3 −101.1\nSpathulenol −90.7 −88.0 −98.4 −77.8 −67.9 −90.4\n(Z)-Spiroether −111.8 −84.9 −103.1 −87.1 −79.3 −102.0\nγ-Terpinene −81.3 −79.3 −93.2 −71.2 −65.3 −76.6\n(R)-Terpinen-4-ol −80.4 −81.9 −89.5 −69.0 −64.9 −75.3\n(S)-Terpinen-4-ol −82.1 −81.8 −88.0 −70.4 −64.4 −76.4\n(R)-α-Terpineol −82.6 −88.3 −91.6 −65.6 −66.0 −72.6\n(S)-α-Terpineol −88.7 −86.8 −94.1 −71.6 −63.5 −82.0\nTerpinolene −80.7 −80.1 −94.7 −68.8 −63.9 −77.4\n(-)-α-Thujone −87.2 −89.3 −94.5 −66.9 −69.2 −78.1\n(+)-β-Thujone −86.9 −80.5 −94.2 −73.7 −69.7 −79.2\nThymohydroquinone dimethyl ether −89.5 −82.8 −104.6 −73.1 −67.0 −85.0\nThymol −84.4 −87.5 −94.6 −72.9 −70.8 −78.4\n2-Undecanone −101.3 −94.0 −108.3 −78.4 −72.8 −90.2\nValencene −84.7 −81.7 −92.6 −74.4 −68.3 −81.7\n(+)-Verbenone −84.7 −73.2 −82.5 −68.4 −54.8 −71.2\n(-)-Verbenone −83.8 −77.7 −77.4 −65.4 −57.8 −68.0\nViridiflorene −86.8 −90.2 −91.0 −76.3 −69.4 −88.8\nα-Zingiberene −106.4 −100.5 −115.4 −82.7 −71.4 −98.6\na Human angiotensin-converting enzyme 2 (hACE2).\nTable 4 Normalized docking scores ( DSnorm, kJ/mol) of essential oil components with bovine odorant binding protein (BtOBP), cruzain, torpedo acetylcholinesterase (TcAChE), Bacillus anthracis nicotinate mononucleotide adenylytransferase (BaNadD), Russell’s viper phospholipase A2 (DrPLA2), and Escherichia coli l-aspartate aminotransferase (EcAspTA).\nCompound BtOBP Cruzain TcAChE BaNadD DrPLA2 EcAspTA\n1GT3 1ME3 6G1U 3HFJ 1FV0 2Q7W\n(E)-Anethole −90.2 −73.3 −96.8 −112.9 −85.3 −88.1\nallo-Aromadendrene −85.0 −70.6 −92.8 −105.8 −87.8 −79.6\nArtemiseole −84.8 −74.2 −84.2 −90.6 −68.0 −71.7\n(R)-Artemisia alcohol −88.4 −68.3 −89.5 −94.8 −80.7 −81.5\n(S)-Artemisia alcohol −86.1 −74.0 −94.8 −101.4 −82.5 −81.4\nArtemisia ketone −93.1 −77.3 −91.5 −107.9 −87.8 −80.6\nAscaridole −79.7 −54.4 −72.1 −79.7 −75.0 −65.3\nBenzyl benzoate −105.0 −82.8 −115.8 −128.1 −97.3 −89.9\n(Z)-trans-α-Bergamotol −1 00.7 −73.6 −107.0 −94.2 −92.6 −85.8\nBicyclogermacrene −97.5 −82.4 −95.6 −105.5 −89.7 −89.0\nBicyclosesquiphellandrene −92.2 −52.5 −91.2 −110.7 −88.4 −75.7\nα-Bisabolol oxide A −94.7 −66.1 −102.8 −102.6 −77.1 −82.7\nα-Bisabolol oxide B −104.6 −90.4 −107.0 −121.9 −94.2 −89.8\nBisabolone oxide A −100.1 −71.9 −96.8 −84.7 −81.2 −86.7\n(+)-Borneol −72.5 −51.0 −72.0 −47.8 −61.4 −62.5\n(-)-Borneol −78.3 −53.1 −70.8 −49.0 −63.3 −56.2\n(+)-iso-Borneol −73.7 −55.6 −74.6 −31.0 −60.9 −59.7\n(-)-iso-Borneol −73.2 −55.3 −77.7 −52.6 −51.0 −57.4\nα-Bulnesene −93.4 −89.3 −109.3 −115.7 −94.4 −95.3\nδ-Cadinene −79.5 −86.8 −105.1 −116.8 −94.8 −82.3\nΤ-Cadinol −87.8 −71.8 −117.7 −121.7 −86.0 −87.0\n(R)-Calamene −80.3 −84.4 −116.5 −120.4 −91.3 −87.7\n(S)-Calamene −80.1 −82.5 −116.2 −121.8 −93.0 −88.3\n(+)-Camphene −79.0 −62.1 −77.0 −75.9 −69.3 −67.5\n(-)-Camphene −77.7 −62.8 −75.2 −77.4 −71.3 −70.6\n(+)-Camphor −76.0 −57.0 −75.0 −49.0 −53.5 −54.1\n(-)-Camphor −80.0 −54.1 −74.4 −52.9 −61.2 −56.4\n(+)-δ-3-Carene −80.4 −64.2 −80.6 −88.0 −71.8 −72.5\n(-)-δ-3-Carene −82.0 −68.9 −84.4 −90.2 −72.8 −72.9\nCarvacrol −82.4 −77.7 −94.8 −106.7 −81.6 −87.5\nCarvacrol methyl ether −85.6 −79.3 −96.6 −111.5 −84.2 −93.6\n(+)-cis-Carveol −89.1 −77.3 −96.9 −109.4 −81.3 −87.6\n(-)-cis-Carveol −89.0 −82.1 −95.5 −109.0 −83.2 −89.4\n(R)-Carvone −86.0 −80.7 −94.6 −109.9 −83.5 −91.5\n(S)-Carvone −88.0 −77.2 −94.1 −105.9 −82.8 −87.2\n(E)-Caryophyllene −87.3 −60.4 −88.1 −87.3 −87.4 −78.6\nCaryophyllene oxide −95.1 −73.1 −90.1 −97.0 −83.8 −77.8\nCedrol −87.7 −63.1 −96.4 −84.4 −86.3 −70.9\nepi-Cedrol −84.0 −59.7 −83.3 −86.7 −80.0 −76.2\nChamazulene −95.2 −89.2 −123.0 −132.1 −98.9 −101.6\n(-)-cis-Chrystanthyl acetate −85.8 −63.7 −89.8 −73.8 −76.5 −71.5\n(-)-trans-Chrysanthenyl acetate −80.9 −69.7 −82.4 −78.5 −76.5 −68.6\n1,8-Cineole −69.3 −51.1 −73.2 −54.4 −49.4 −47.3\n(E)-Cinnamaldehyde −87.7 −77.6 −98.2 −110.1 −85.7 −89.5\n(E)-Cinnamyl acetate −95.9 −88.2 −107.4 −132.5 −94.6 −103.1\n(R)-Citronellal −98.1 −90.5 −109.3 −120.7 −88.3 −105.7\n(S)-Citronellal −95.0 −89.7 −108.5 −123.3 −86.9 −104.1\n(R)-Citronellol −91.0 −90.0 −108.2 −122.4 −88.6 −107.7\n(S)-Citronellol −92.5 −91.9 −108.5 −122.0 −90.3 −100.3\n(R)-Citronellyl formate −98.0 −93.5 −118.7 −129.5 −87.5 −108.5\n(S)-Citronellyl formate −99.7 −95.1 −111.2 −135.6 −91.5 −94.8\nα-Copaene −88.9 −69.9 −84.6 −78.7 −81.7 −61.9\nCostunolide −106.8 −87.5 −116.7 −120.1 −100.3 −89.1\n(R)-Cryptone −74.9 −68.1 −92.2 −100.0 −78.5 −80.8\n(S)-Cryptone −79.0 −68.5 −91.6 −100.7 −82.7 −79.6\nβ-Cubebene −99.8 −67.2 −106.9 −112.2 −93.9 −94.8\nCuminaldehyde −84.9 −79.1 −95.3 −109.1 −90.1 −89.5\nar-Curcumene −98.1 −87.5 −116.0 −125.7 −94.1 −95.3\nCurcumol −90.1 −67.6 −100.4 −88.0 −87.6 −81.5\nCurdione −96.4 −75.1 −99.3 −116.3 −91.0 −78.7\nCurzerene −96.4 −80.3 −109.4 −89.7 −91.1 −86.4\nm-Cymene −78.9 −73.1 −96.1 −99.1 −76.6 −88.0\no-Cymene −77.0 −61.9 −89.8 −97.8 −76.2 −77.2\np-Cymene −82.8 −73.2 −91.3 −96.8 −80.9 −84.3\n(E)-β-Damascenone −90.1 −80.5 −100.7 −105.4 −88.9 −80.0\n(2E,4E)-Decadienal −96.4 −87.0 −110.4 −129.7 −95.8 −114.8\nDodecanal −95.8 −83.7 −110.3 −127.3 −89.2 −108.9\nEremanthin −80.1 −87.9 −121.3 −132.4 −98.7 −91.8\nβ-Eudesmol −95.2 −76.1 −98.6 −114.1 −85.3 −87.1\nγ-Eudesmol −94.9 −78.2 −106.1 −105.2 −89.7 −89.1\nEugenol −90.4 −82.4 −103.9 −119.3 −87.3 −98.8\nEugenol methyl ether −93.6 −78.1 −106.3 −116.8 −89.3 −94.4\nEugenyl acetate −94.9 −83.4 −109.2 −126.1 −100.1 −104.6\n(E,E)-α-Farnesene −115.5 −103.7 −129.8 −131.8 −101.2 −111.4\n(E)-β-Farnesene −112.1 −103.2 −122.7 −131.8 −105.3 −108.6\n(E,E)-Farnesol −116.8 −96.2 −133.0 −135.6 −100.5 −109.0\n(+)-Fenchone −78.4 −60.5 −79.5 −79.8 −62.4 −69.9\n(-)-Fenchone −80.3 −61.5 −81.0 −84.2 −65.5 −60.7\nFlavesone −87.1 −56.0 −88.6 −92.1 −85.2 −80.3\nGeranial −96.5 −94.9 −111.7 −119.3 −92.1 −101.5\nGeraniol −95.5 −93.6 −109.7 −118.0 −94.3 −107.3\nGeranyl formate −100.2 −89.7 −115.4 −128.3 −94.8 −114.1\nGermacrene D −102.4 −88.8 −109.9 −116.5 −93.7 −90.0\nGermacrone −92.4 −68.3 −94.5 −102.9 −88.3 −80.0\nGuiaol −100.8 −88.5 −113.3 −107.5 −92.6 −94.0\nα-Gurjunene −80.6 −61.6 −84.6 −100.0 −83.6 −78.1\nβ-Gurjunene −89.3 −38.8 −80.3 11.3 −77.6 −71.1\nα-Himachalene −89.2 −67.9 −83.9 −96.3 −87.6 −73.4\nβ-Himachalene −81.9 −65.4 −96.1 −110.8 −91.4 −76.8\nHimachalol −91.5 −64.1 −81.2 −24.7 −81.7 −66.3\nα-Humulene −94.0 −80.0 −89.9 −113.6 −89.2 −82.5\nLeptospermone −89.6 −64.0 −92.2 −102.7 −88.8 −80.7\niso-Leptospermone −92.8 −63.0 −90.1 −99.4 −86.2 −78.2\n(R)-Limonene −86.2 −75.7 −92.4 −99.6 −81.7 −86.8\n(S)-Limonene −84.9 −77.6 −93.4 −99.8 −83.3 −87.3\n(R,S,R)-Limonene oxide −87.1 −76.0 −93.2 −110.7 −84.9 −86.3\n(S,R,R)-Limonene oxide −84.6 −68.8 −85.0 −84.3 −76.2 −69.8\n(S,R,S)-Limonene oxide −91.2 −73.8 −97.4 −93.6 −85.1 −87.9\n(R)-Linalool −95.5 −89.9 −116.6 −112.4 −90.3 −89.9\n(S)-Linalool −93.0 −88.9 −110.1 −111.9 −91.0 −95.7\n(R)-Linalyl acetate −96.9 −87.1 −107.1 −112.5 −87.1 −95.2\n(S)-Linalyl acetate −100.0 −90.5 −110.2 −114.3 −86.6 −87.1\np-Mentha-1(7),8-diene −83.3 −74.4 −93.6 −100.0 −82.9 −84.9\n(+)-Menthol −86.1 −66.4 −98.6 −106.1 −79.2 −90.8\n(-)-Menthol −81.0 −68.9 −97.5 −106.3 −80.5 −89.7\nMenthone −82.4 −72.0 −92.6 −98.2 −82.8 −83.5\niso-Menthone −79.9 −64.8 −88.2 −102.4 −75.1 −82.0\nα-Muurolene −91.2 −79.9 −95.6 −113.7 −90.0 −82.8\n(+)-γ-Muurolene −85.2 −77.0 −98.7 −113.9 −93.2 −78.7\n(-)-γ-Muurolene −83.1 −83.4 −96.9 −106.3 −82.9 −80.5\nMyrcene −90.4 −88.8 −109.0 −112.7 −90.3 −101.1\nNeral −95.1 −94.1 −111.1 −122.8 −90.9 −105.4\n(E)-Nerolidol −111.5 −101.8 −131.9 −131.3 −99.6 −110.5\n(E)-β-Ocimene −91.8 −89.4 −104.6 −116.4 −89.0 −97.0\n(Z)-β-Ocimene −89.7 −90.6 −106.8 −112.1 −90.3 −94.4\nOctanal −85.8 −79.8 −97.6 −112.0 −85.7 −102.7\n(R)-2-Octen-3-ol −84.3 −81.5 −106.9 −107.1 −83.3 −101.1\n(S)-1-Octen-3-ol −84.5 −82.4 −108.4 −105.9 −85.0 −99.5\n3-Octanone −84.2 −82.5 −102.6 −111.6 −82.9 −101.8\nPatchouli alcohol −75.1 −41.4 −71.1 100.1 −10.1 −49.2\n(R)-Phellandral −92.3 −79.3 −97.4 −108.1 −88.9 −89.5\n(S)-Phellandral −92.9 −79.9 −96.1 −109.2 −88.9 −88.8\n(R)-α-Phellandrene −84.0 −69.7 −94.7 −100.8 −82.4 −83.8\n(S)-α-Phellandrene −84.3 −69.6 −93.5 −99.4 −82.6 −80.6\n(R)-β-Phellandrene −82.2 −69.9 −93.5 −102.0 −80.6 −84.1\n(S)-β-Phellandrene −83.8 −69.0 −93.2 −100.5 −80.2 −81.2\nPhytol −112.8 −93.8 −132.4 −134.7 −102.4 −112.9\nPhytone −117.8 −92.1 −124.5 −131.1 −99.7 −107.2\n(+)-α-Pinene −74.2 −58.0 −73.4 −62.4 −62.5 −54.4\n(-)-α-Pinene −72.8 −58.3 −70.4 −64.6 −61.7 −57.2\n(+)-β-Pinene −70.9 −57.8 −74.0 −64.1 −60.9 −55.5\n(-)-β-Pinene −73.5 −58.4 −73.1 −65.0 −63.7 −57.0\n(+)-Pinocamphone −76.5 −58.2 −73.6 −53.1 −55.4 −63.6\n(-)-Pinocamphone −76.6 −66.1 −76.5 −65.9 −72.3 −62.7\n(+)-iso-Pinocamphone −75.3 −59.0 −76.6 −54.0 −59.1 −58.1\n(-)-iso-Pinocamphone −76.2 −59.6 −76.7 −56.4 −65.8 −56.2\n(+)-cis-Pinocarveol −75.7 −58.2 −75.2 −51.7 −57.5 −58.1\n(-)-cis-Pinocarveol −75.7 −63.9 −73.5 −52.5 −66.3 −54.5\n(+)-trans-Pinocarveol −77.5 −60.6 −76.5 −71.1 −63.9 −61.4\n(-)-trans-Pinocarveol −72.4 −58.6 −77.2 −71.4 −56.3 −62.6\n(+)-Piperitone oxide −88.5 −70.5 −100.5 −104.2 −80.4 −78.0\n(-)-Piperitone oxide −86.0 −73.6 −99.6 −104.5 −80.7 −83.8\n(-)-iso-Pulegol −85.1 −72.0 −93.5 −106.7 −83.5 −93.8\n(R)-Pulegone −81.8 −69.9 −90.3 −103.9 −78.4 −74.4\n(S)-Pulegone −79.7 −69.6 −89.3 −99.9 −81.5 −76.4\nRotundifolone −86.1 −72.1 −96.1 −100.0 −82.4 −72.1\n(+)-Sabinene −87.9 −66.6 −84.5 −92.1 −80.5 −78.2\n(-)-Sabinene −79.7 −68.4 −91.4 −96.0 −80.8 −75.8\ncis-Sabinene hydrate −88.1 −70.2 −84.5 −91.1 −72.3 −68.1\n(Z)-α-Santalol −108.5 −85.6 −113.4 −106.8 −96.8 −90.7\n(E)-β-Santalol −105.0 −90.2 −110.6 −113.3 −94.3 −94.0\n(Z)-β-Santalol −108.0 −85.3 −110.4 −110.9 −96.5 −92.6\nβ-Sesquiphellandrene −103.9 −92.2 −116.6 −127.5 −99.4 −98.3\nSpathulenol −95.9 −94.8 −97.7 −102.8 −84.3 −102.2\n(Z)-Spiroether −112.8 −85.5 −124.3 −136.1 −101.5 −102.9\nγ-Terpinene −84.3 −74.9 −93.4 −98.7 −82.8 −85.9\n(R)-Terpinen-4-ol −87.3 −66.7 −81.5 −94.0 −80.2 −72.2\n(S)-Terpinen-4-ol −87.1 −67.2 −78.9 −92.3 −80.2 −71.7\n(R)-α-Terpineol −82.0 −68.0 −80.3 −82.2 −77.6 −71.3\n(S)-α-Terpineol −76.9 −75.5 −103.6 −101.7 −86.6 −84.9\nTerpinolene −83.1 −69.8 −89.0 −101.8 −84.8 −72.9\n(-)-α-Thujone −81.4 −66.2 −84.9 −93.4 −72.6 −74.1\n(+)-β-Thujone −87.6 −66.4 −89.9 −102.9 −71.7 −86.9\nThymohydroquinone dimethyl ether −86.3 −75.8 −103.7 −116.0 −85.3 −95.5\nThymol −84.4 −70.8 −96.4 −107.1 −79.7 −91.8\n2-Undecanone −94.5 −90.2 −110.0 −129.7 −91.9 −107.6\nValencene −96.7 −75.1 −103.3 −114.7 −87.8 −76.6\n(+)-Verbenone −74.3 −64.5 −79.3 −71.6 −63.9 −72.3\n(-)-Verbenone −73.5 −63.1 −78.0 −65.3 −64.8 −59.3\nViridiflorene −81.9 −68.6 −102.1 −106.9 −73.1 −81.9\nα-Zingiberene −108.3 −90.9 −113.8 −123.4 −97.7 −99.9 "}

{"project":"LitCovid-PD-GO-BP","denotations":[{"id":"T1","span":{"begin":303,"end":318},"obj":"http://purl.obolibrary.org/obo/GO_0006605"},{"id":"T2","span":{"begin":603,"end":614},"obj":"http://purl.obolibrary.org/obo/GO_0016791"},{"id":"T3","span":{"begin":2476,"end":2492},"obj":"http://purl.obolibrary.org/obo/GO_0016032"},{"id":"T4","span":{"begin":6303,"end":6312},"obj":"http://purl.obolibrary.org/obo/GO_0016032"},{"id":"T5","span":{"begin":6303,"end":6312},"obj":"http://purl.obolibrary.org/obo/GO_0009405"},{"id":"T6","span":{"begin":11921,"end":11936},"obj":"http://purl.obolibrary.org/obo/GO_0006605"},{"id":"T7","span":{"begin":12186,"end":12201},"obj":"http://purl.obolibrary.org/obo/GO_0006605"},{"id":"T8","span":{"begin":12335,"end":12346},"obj":"http://purl.obolibrary.org/obo/GO_0016791"},{"id":"T9","span":{"begin":14451,"end":14466},"obj":"http://purl.obolibrary.org/obo/GO_0016032"},{"id":"T10","span":{"begin":15290,"end":15301},"obj":"http://purl.obolibrary.org/obo/GO_0016791"},{"id":"T11","span":{"begin":16508,"end":16523},"obj":"http://purl.obolibrary.org/obo/GO_0039703"},{"id":"T12","span":{"begin":16625,"end":16642},"obj":"http://purl.obolibrary.org/obo/GO_0019079"},{"id":"T13","span":{"begin":16625,"end":16642},"obj":"http://purl.obolibrary.org/obo/GO_0019058"},{"id":"T14","span":{"begin":19704,"end":19719},"obj":"http://purl.obolibrary.org/obo/GO_0006605"},{"id":"T15","span":{"begin":22298,"end":22313},"obj":"http://purl.obolibrary.org/obo/GO_0006605"},{"id":"T16","span":{"begin":22602,"end":22613},"obj":"http://purl.obolibrary.org/obo/GO_0016791"},{"id":"T17","span":{"begin":24517,"end":24528},"obj":"http://purl.obolibrary.org/obo/GO_0016791"},{"id":"T18","span":{"begin":28835,"end":28846},"obj":"http://purl.obolibrary.org/obo/GO_0016791"},{"id":"T19","span":{"begin":29242,"end":29253},"obj":"http://purl.obolibrary.org/obo/GO_0016791"},{"id":"T20","span":{"begin":51179,"end":51196},"obj":"http://purl.obolibrary.org/obo/GO_0019079"},{"id":"T21","span":{"begin":51179,"end":51196},"obj":"http://purl.obolibrary.org/obo/GO_0019058"}],"text":"Essential Oils as Antiviral Agents, Potential of Essential Oils to Treat SARS-CoV-2 Infection: An In-Silico Investigation\n\nAbstract\nEssential oils have shown promise as antiviral agents against several pathogenic viruses. In this work we hypothesized that essential oil components may interact with key protein targets of the 2019 severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2). A molecular docking analysis was carried out using 171 essential oil components with SARS-CoV-2 main protease (SARS-CoV-2 Mpro), SARS-CoV-2 endoribonucleoase (SARS-CoV-2 Nsp15/NendoU), SARS-CoV-2 ADP-ribose-1″-phosphatase (SARS-CoV-2 ADRP), SARS-CoV-2 RNA-dependent RNA polymerase (SARS-CoV-2 RdRp), the binding domain of the SARS-CoV-2 spike protein (SARS-CoV-2 rS), and human angiotensin−converting enzyme (hACE2). The compound with the best normalized docking score to SARS-CoV-2 Mpro was the sesquiterpene hydrocarbon (E)-β-farnesene. The best docking ligands for SARS−CoV Nsp15/NendoU were (E,E)-α-farnesene, (E)-β-farnesene, and (E,E)−farnesol. (E,E)−Farnesol showed the most exothermic docking to SARS-CoV-2 ADRP. Unfortunately, the docking energies of (E,E)−α-farnesene, (E)-β-farnesene, and (E,E)−farnesol with SARS-CoV-2 targets were relatively weak compared to docking energies with other proteins and are, therefore, unlikely to interact with the virus targets. However, essential oil components may act synergistically, essential oils may potentiate other antiviral agents, or they may provide some relief of COVID-19 symptoms.\n\n1. Introduction\nThe 2019 severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) is a newly emerging respiratory illness. The epidemic started in December 2019 in Wuhan, China, and has rapidly spread throughout China and the world and is now a global pandemic. SARS-CoV-2 can be efficiently transmitted among humans and has shown a high degree of morbidity and mortality [1,2]. As of April 20, 2020, the worldwide number of infected individuals was 2,544,792, with as many as 175,694 deaths [3]. There are currently no approved vaccines available for the prevention of SARS-CoV-2 infection and only just recently, remdesivir has received “emergency use authorization” for treatment of COVID-19 in the United States; therefore, there is an urgent demand for potential chemotherapeutic agents to treat this disease.\nEssential oils have been screened against several pathogenic viruses (Table 1), including influenza and other respiratory viral infections. Influenza is an infectious respiratory disease caused by one of three types of influenza viruses, type A, type B, or type C [4]. The most significant in terms of human morbidity and mortality is influenza virus type A, which is found in several bird and mammal species [5]. Several different serotypes of influenza type A have caused global flu pandemics [6]: H1N1, which caused the Spanish flu in 1918 (40–50 million deaths worldwide) [7] and the swine flu in 2009 [8]; the Asian flu of 1957–1958 (ca. 1.5 million deaths worldwide) was caused by influenza A H2N2 [8]; serotype H3N2 caused the Hong Kong flu in 1968 [9]; and H5N1, which caused the bird flu in 2004 [10]. Influenza virus type B, however, is largely confined to human hosts [11].\nOne study evaluated the in vitro antiviral effect against influenza type A (H1N1) of commercial essential oils that included cinnamon (Cinnamomum zeylanicum), bergamot (Citrus bergamia), lemongrass (Cymbopogon flexuosus), thyme (Thymus vulgaris), and lavender (Lavandula angustifolia). The oils were tested in the liquid phase at a concentration of 0.3% and in the vapor phase. The oils of cinnamon, bergamot, thyme, and lemongrass displayed 100% inhibition of H1N1 in the liquid phase, while the inhibition for lavender essential oil was 85%. However, in the vapor phase, 100% inhibition was observed only for cinnamon leaf essential oil after 30 min of exposure. The bergamot, lemongrass, thyme, and lavender essential oils displayed inhibition rates of 95%, 90%, 70%, and 80%, respectively [12].\nCinnamomum zeylanicum leaf oil is characterized by eugenol (75–85%), followed by smaller amounts of linalool (1.6–8.5%), and benzyl benzoate (0.1–8.3%) [13,14,15]. Bergamot oil is rich in limonene (23–55%), linalool (2–37%), and linalyl acetate (12–41%), with lesser quantities of β-pinene (up to 10%) and γ-terpinene (up to 10%) [16,17,18,19,20]. Geranial (48–54%) and neral (29–33%) have been reported as the major components of C. flexuosus, but many chemotypes, cultivars, and variants have been reported for C. flexuosus [21,22].\nIn the literature, there have been at least 20 different chemotypes identified for thyme essential oil. The “typical” thyme essential oil presents a thymol content of 45% (range 31–50%), with significant concentrations of p-cymene (0.1–26.6%, average = 15.6%) and γ-terpinene (up to 22.8%, average = 9.3%). In addition, there are several other chemotypes of T. vulgaris rich in thymol and/or carvacrol [23]. Thymol has been identified as an anti-influenza agent against influenza type A and parainfluenza type 3 virus [24,25]. Lavandula angustifolia essential oil is rich in linalyl acetate (37.0–43.6%), linalool (19.7–39.1%), geraniol (up to 9.3%), β-caryophyllene (up to 5.1%), terpinen-4-ol (up to 14.9%), lavandulyl acetate (up to 5.5%), and borneol (up to 6.4%) [26,27,28,29].\nAnother essential oil with notable anti-influenza effects is tea tree, which is extracted from the leaves of Melaleuca alternifolia (Myrtaceae). Commercial tea tree oil is composed of terpinen-4-ol (30–48%), γ-terpinene (10–28%), α-terpinene (5–13%), 1,8-cineole (up to 15%), terpinolene (1.5–5%), p-cymene (0.5–12%), α-pinene (1–6%), and α-terpineol (1.5–8%) [30]. Tea tree oil showed 100% inhibition of influenza type A (H1N1) virus at 0.01% concentration and a median inhibitory concentration (IC50) of 6 μg/mL [31,32]. In addition, 30 min exposure of type A (H11N9) virus to tea tree oil vapor caused 100% inhibition [33]. The tea tree oil components, terpinen-4-ol, terpinolene, and α-terpineol, have shown anti-influenza virus activity against type A (H1N1), with IC50 values of 25, 12, and 250 μg/mL, respectively. α-Terpinene, γ-terpinene, and p-cymene were inactive, however [31].\nAvian influenza viruses (H5N1) exhibit both high and low virulence in numerous mammalian species, highlighting the connection between the route of inoculation and virus pathogenicity [34]. Since 2003, there have been over 600 documented cases of human infection with H5N1 viruses, with most cases among young, previously healthy individuals [35]. The essential oils extracted from Citrus reshni leaves and peel (unripe and ripe fruits) were tested against H5N1 virus by plaque reduction assay. The oils showed moderate inhibition of the H5N1 virus at a concentration of 2.5 μL/mL. Sabinene (40.5%), linalool (23.3%), and terpinen-4-ol (8.3%) were the main constituents in the leaf oil while limonene (82.4%, 91.6%) was the main compound in the fruit peel essential oils (unripe and ripe, respectively) [36].\nThe essential oil of leaves of Fortunella margarita is rich in the sesquiterpenoids β-eudesmol (28.3%), α-muurolene (10.3%), β-gurjunene (10.0%), γ-eudesmol (8.4%), and γ-muurolene (6.6%) while the essential oil extracted from the fruits showed monterpenoids as the main components, α-terpineol (55.5%), carvone (5.7%), and carveol (5.5%). Both samples were tested for antiviral activity against avian influenza (H5N1) virus, and the obtained results revealed that the fruit essential oil was more effective (80% virus inhibition by the MTT (3-(4,5-dimethylthiazol-2-yl)-2,5-diphenyltetrazolium bromide) assay using Madin−Darby canine kidney (MDCK) cells for virus propagation). The IC50 values obtained for the leaf and fruit essential oils were 38.89 and 6.77 μg/mL, respectively [53].\nDengue fever, a mosquito−borne disease, is caused by dengue virus (DENV) which includes four major serotypes (DENV-1, -2, -3, and -4). Some serotypes cause more severe diseases than others; severe dengue is associated with secondary infections by a different serotype. Dengue disease is a major public health problem in developing tropical countries and has being continuously spreading to new geographical areas [92]. The essential oils of two species of Lippia were assayed against four dengue serotypes (DENV-1, DENV-2, DENV-3, DENV-4) [61]. The IC50 values for Lippia alba oil, rich in carvone (39.7%), limonene (30.6%), and bicyclosesquiphellandrene (8.9%), were between 0.4 and 32.6 μg/mL. However, the Lippia citrodora essential oil, composed of geranial (18.9%), neral (15.6%), limonene (10.7%), and 1,8-cineole (5.0%), showed the best activity, with IC50 values varying from 1.9 to 33.7 μg/mL. No viral inhibitory effect was observed by addition of the essential oil after virus adsorption; the inhibitory effect of the essential oil seemed to cause direct virus inactivation before adsorption on the host cell.\nThe essential oils of seven aromatic plants from Córdoba, San Luis, and San Juan provinces (Argentina) were screened for cytotoxicity and in vitro inhibitory activity against dengue virus type 2 (DENV−2) [38]. The oils of Jungia polita and Buddleja cordobensis were composed of caryophyllene oxide (9.18%, 32.1%) and β-caryophyllene (8.13%, 16.5%) as the major compounds. However, these oils displayed different IC50 values (86.4 and 39.8 μg/mL, respectively). The other samples were composed mostly of monoterpenes and displayed lower activity, except Pectis odorata oil, which presented limonene (50.2%), neral (27.2%), and geranial (23.6%) as the major compounds and an IC50 value of 39.6 μg/mL. In addition, the essential oils of Artemisia mendozana, rich in camphor (22.4%), artemisole (11.7%), and artemisia alcohol (10.8%); Gailardia megapotamica composed of β-pinene (35.5%), spathulenol (10.7%), and germacrene D (6.8%); and Heterothalamus alienus characterized by β-pinene (35.5%), spathulenol (10.7%), and germacrene D (6.8%), showed an average IC50 value of 130.63 μg/mL.\nYellow fever (YF), caused by yellow fever virus (YFV), has historically been considered one of the most dangerous infectious diseases. YFV is transmitted to humans via mosquitoes of the Haemogogus, Sabethes, and Aedes genera. Annually, there are approximately 80,000–200,000 YFV cases worldwide, with a case fatality rate (CFR) ranging from 20–60% [93,94]. Essential oils of Lippia species and their main compounds have been tested against yellow fever virus (YFV) in Vero cells. The oil of Lippia origanoides showed carvacrol (44.0%), thymol (15.0%), and γ-terpinene (10.0%) as the main compounds and displayed 100% inhibition at a concentration of 11.1 μg/mL [43]. However, in the same study, the oil of L. alba displayed 100% inhibition at a concentration of 100.0 μg/mL. The major compounds were carvone (51.0%), limonene (33.0%), and bicyclosesquiphellandrene (7.0%). The essential oil of L. alba with a similar chemical composition, carvone (39.7%), limonene (30.6%), and bicyclosesquiphellandrene (8.9%), displayed an IC50 value of 4.3 μg/mL against YFV when tested in Vero cells using the MTT assay [62]. The essential oil of L. citriodora, dominated by geranial (18.9%), neral (15.6%), and limonene (10.7%), did not display a statistical difference in comparison to citral, with IC50 values of 19.4 and 17.6 μg/mL, respectively [62].\nIn addition to essential oils, several individual essential oil components have been screened for antiviral activity (Table 2).\nBecause of the activities of several essential oils and essential oil components against human pathogenic viruses, we hypothesized that essential oil components may be potentially useful as antiviral agents against SARS-CoV-2. In this work, we carried out a molecular docking analysis of the major components of essential oils that exhibit antiviral activity (Table 1 and Table 2) with known SARS-CoV-2 protein targets.\n\n2. Results and Discussion\nSeveral proteins have been identified for severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2), which may serve as potential targets for chemotherapeutic intervention in coronavirus disease 2019 (COVID-19). These protein targets include SARS-CoV-2 main protease (SARS-CoV-2 Mpro), SARS-CoV-2 endoribonucleoase (SARS-CoV-2 Nsp15/NendoU), SARS-CoV-2 ADP−ribose−1″−phosphatase (SARS-CoV-2 ADRP), SARS-CoV-2 RNA-dependent RNA polymerase (SARS-CoV-2 RdRp), the binding domain of the SARS-CoV-2 spike protein (SARS-CoV-2 rS), and human angiotensin−converting enzyme (hACE2). There have already been several molecular docking studies on these macromolecular targets. Several groups have carried out molecular docking of natural product libraries with SARS-CoV-2 Mpro [102,103,104,105]. Additionally, commercially available drugs have also been examined using in silico methods [106,107].\nA molecular docking study was carried out with 171 essential oil components with SARS-CoV-2 Mpro (PDB: 5R7Z, 5R80, 5R81, 5R82, 5R83, 5R84, 6LU7, 6M03, and 6Y84), SARS-CoV-2 Nsp15/NendoU (PDB: 6VWW, 6W01, and 6W02), SARS-CoV-2 rS (PDB: 6M0J, 6M17, 6VX1, and 6VW1), and SARS-CoV-2 RdRp (PDB: 6M71). The best docking scores are summarized in Table 3.\nThe main protease, SARS-CoV-2 Mpro, is a cysteine protease that is essential for processing the polyproteins that are translated from the coronavirus RNA [108]. The substrate binding site of the enzyme is a cleft flanked by Gln189, Met49, Pro168, Glu166 and His41; the active site is Cys145 and His41. The compound with the best normalized docking score to SARS-CoV-2 Mpro was the sesquiterpene hydrocarbon (E)-β-farnesene (DSnorm = −115.4 kJ/mol). Other essential oil components showing good docking scores with SARS-CoV-2 Mpro were (E,E)-α-farnesene (DSnorm = −115.0 kJ/mol), (E,E)-farnesol (DSnorm = −112.4 kJ/mol), and (E)-nerolidol (DSnorm = −110.7 kJ/mol). The sesquiterpene hydrocarbons (E,E)-α-farnesene and (E)-β-farnesene occupy the substrate binding site, flanked by Gln189, Arg188, Met165, His41, and Asp 187 (Figure 1). The lowest-energy docked poses of both (E,E)-farnesol and (E)-nerolidol showed hydrogen bonding of the alcohol moiety to Gln192 and Thr190 and, in the case of (E)-nerolidol, also with GLN189 and ARG188 (Figure 2).\nNon-structural protein 15 (Nsp15) of SARS-CoV-2 is an endoribonuclease that preferentially cleaves RNA at uridylate. Furthermore, it has been shown that SARS-CoV Nsp15/NendoU is required for successful viral infection [109]. The best docking ligands for SARS-CoV Nsp15/NendoU are (E,E)-α-farnesene (DSnorm = −107.5 kJ/mol), (E)-β-farnesene (DSnorm = −105.0 kJ/mol), (E,E)-farnesol (DSnorm = −104.6 kJ/mol), and (E)-nerolidol (DSnorm = −101.6 kJ/mol). All of these sesquiterpenoids preferentially docked into a binding site formed by amino acid residues Gln347, Ile328, Val276, Ser274, Thr275, Ser329, Asn74, Asn75, Glu327, and Lys71 (Figure 3). In addition to van der Waals interactions, (E,E)-farnesol showed hydrogen-bonding interactions with Ser329 and Glu327, while (E)-nerolidol hydrogen bonded with Asn75 and Lys71 (Figure 3). Unfortunately, the docking scores for these ligands as well as the scores of the other essential oil components with this protein are too low for it to be considered a viable target (see Table 3).\nADP ribose phosphatase (ADRP) serves to convert ADP-ribose 1″-monophosphate (Appr-1″-p) to ADP-ribose (Appr), which serves to regulate virus replication [110]. This enzyme may be dispensable in SARS-CoV-2, however [111]. Nevertheless, (E,E)-farnesol showed the most exothermic docking to SARS-CoV-2 ADRP with DSnorm = −121.4 kJ/mol. The binding site in SARS-CoV-2 ADRP is surrounded by Phe132, Asn40, Ile131, Ala38, and Ala39, with hydrogen-bonded interactions between the ligand alcohol and Asn40 (Figure 4). Additional essential oil components with good docking scores with SARS-CoV-2 ADRP include the sesquiterpene hydrocarbons (E)-β-farnesene (DSnorm = −116.3 kJ/mol), (E,E)-α-farnesene (DSnorm = −114.2 kJ/mol), β-sesquiphellandrene (DSnorm = −115.7 kJ/mol), and α-zingiberene (DSnorm = −115.4 kJ/mol); the diterpenoids phytol (DSnorm = −118.9 kJ/mol) and phytone (DSnorm = −116.9 kJ/mol); and the phenylpropanoid eugenyl acetate (DSnorm = −115.4 kJ/mol). Not surprisingly, β-sesquiphellandrene and α-zingiberene adopted the same docking orientation in the binding site of the enzyme (Figure 5A). Similarly, phytol and phytone occupy the same location in the binding site (Figure 5B).\nRNA-dependent RNA polymerase catalyzes RNA replication from an RNA template and is an essential enzyme in RNA viruses. Because these enzymes are crucial in viral replication, they are viable targets in antiviral chemotherapy [112]. Molecular docking of essential oil components with SARS-CoV-2 RdRp showed only weak docking with this enzyme target (Table 3). The ligand with the best docking score was (E,E)-farnesol, with DSnorm = −89.6 kJ/mol.\nThe SARS-CoV-2 spike protein serves to attach to angiotensin-converting enzyme 2 (ACE2) of the human cell to be invaded. The interface between SARS-CoV-2 rS and human ACE2 would be a promising target to prevent binding of SARS-CoV-2 rS to human ACE2 [113,114]. The best docking ligands with human ACE2, i.e., normalized docking scores \u003c -100 kJ/mol (α-bulnesene, eremanthin, (E,E)-α-farnesene, (E)-β-farnesene, (E,E)-farnesol, (E)-nerolidol, β-sesquiphellandrene, and (Z)-spiroether), all show docking preference to a cavity removed from the interaction interface between the SARS-CoV-2 spike protein and ACE2 (Figure 6). This cavity is a pocket surrounded by residues Pro565, Leu95, Val209, Asn210, Leu91, Lys94, Glu208, and Glu564. Because of the remote location of docking with ACE2, it is predicted that interaction of essential oil components with ACE2 will not prevent protein–protein interaction between the SARS-CoV-2 spike protein and human ACE2.\nOn the other hand, the lowest energy poses of essential oil components showing the strongest docking (\u003c−80 kJ/mol; (E)-cinnamyl acetate, eremanthin, (E,E)-α-farnesene, (E)-β-farnesene, (E,E)-farnesol, and geranyl formate) with the binding domain of the SARS-CoV-2 spike protein do lie at the interface between the SARS-CoV-2 spike protein and human ACE2 (Figure 6). This docking site is a hydrophobic pocket formed by Tyr505, Tyr495, Asn501, Arg403, Tyr453, and Gly502. Unfortunately, the docking energies at this site are too weak and are unlikely, therefore, to disrupt binding between SARS-CoV-2 rS and human ACE2.\nIn order to compare docking scores of the essential oil components with other proteins, docking was also carried out with six randomly selected non-virus proteins: Bovine odorant binding protein (BtOBP, PDB: 1GT3), cruzain (PDB: 1ME3), torpedo acetylcholinesterase (TcAChE, PDB: 6G1U), Bacillus anthracis nicotinate mononucleotide adenylytransferase (BaNadD, PDB: 3HFJ), Russell’s viper phospholipase A2 (DrPLA2, PDB: 1FV0), and Escherichia coli l-aspartate aminotransferase (EcAspTA, PDB: 2Q7W). Docking scores for these proteins are summarized in Table 4.\nThe docking results of the essential oil components with the six randomly selected proteins indicate the best docking ligands to SARS-CoV-2 targets (i.e., (E,E)-α-farnesene, (E)-β-farnesene, and (E,E)-farnesol) have better docking energies with other proteins. These three sesquiterpenes have docking energies of −129.8, −122.7, and −133.0 kJ/mol with TcAChE, respectively, and −131.8, −131.8, and −135.6 kJ/mol, respectively, with BaNadD. Indeed, most of the essential oil ligands have better docking properties with one or more of the random proteins compared to the SARS-CoV-2 proteins.\nBased on the docking energies of essential oil components with key protein targets of SARS-CoV-2, the individual essential oil components cannot be considered viable chemotherapeutic agents for interaction with the SARS-CoV-2 target proteins. However, essential oils are complex mixtures of compounds and several essential oil components may act synergistically to inhibit the virus. Astani and co-workers have shown, for example, that the antiviral activity (HSV-1) of Eucalyptus oil is much greater than the major component 1,8-cineole, and that tea tree oil has a greater antiviral activity than its components terpinen-4-ol, γ-terpinene, and α-terpinene [52].\nSynergistic effects have also been observed between essential oils and synthetic antiviral agents. Civitelli and co-workers observed an antiviral synergism between Mentha suaveolens essential oil and acyclovir on HSV-1 [64]. Likewise, Melissa officinalis essential oil potentiated the activity of oseltamivir against avian influenza virus H9N2 [115]. Furthermore, essential oils are lipophilic and therefore may also serve to disintegrate viral membranes [116].\nOutside of antiviral activity, there may be some relief of symptoms of COVID-19 provided by essential oils. For example, linalool [117,118], β-caryophyllene [119,120], and 1,8-cineole [121,122] have both anti-inflammatory and antinociceptive activity; menthol [123,124], camphor [125,126], and thymol [127] have antitussive activities.\n\n3. Materials and Methods\n\n3.1. Bibliographic Search Criteria\nThe bibliographic research was performed using the databases Google Scholar, Pubmed, Science Direct, Medline, and Scopus. The keywords applied were “antiviral activity” and “essential oils”, “antiviral activity” and “volatile compounds”, and “essential oils” and “respiratory diseases”.\n\n3.2. Ligand Selection\nThe major components (\u003e5%) of essential oils and pure essential oil components that have been screened against human pathogenic viruses were selected. In the case where enantiomers are known to be natural products, both structures were selected. A total of 171 essential oil components were used in the virtual screening.\n\n3.3. Molecular Docking\nEach ligand structure was prepared using Spartan ’18 v. 1.4.4 (Wavefunction, Inc., Irvine, CA, USA). The lowest-energy conformations of the ligands were determined and used as starting structures in the molecular docking. This is particularly important to include all potential conformations in medium-sized rings where interconversion between conformations may be hindered (e.g., bicyclogermacrene, costunolide, curdione, germacrene D, germacrone, and α-humulene). A total of six protein targets of SARS-CoV-2 from the Protein Data Bank (PDB), represented by a total of 17 structures, were used in the molecular docking, including SARS-CoV-2 main protease (PDB: 5R7Z, 5R80, 5R81, 5R82, 5R83, 5R84, 6LU7, 6M03, and 6Y84), SARS-CoV-2 endoribonuclease (PDB: 6VWW), SARS-CoV-2 ADP ribose phosphatase (PDB: 6W01 and 6W02), SARS-CoV-2 RNA-dependent RNA polymerase (PDB: 6M71), SARS-CoV-2 spike protein binding domain (PDB: 6M0J, 6VX1, 6VW1, and 6M17), and the human angiotensin-converting enzyme (PDB: 6M0J, 6VX1, 6VW1, and 6M17). Molecular docking was carried out using Molegro Virtual Docker v. 6.0.1 (Aarhus, Denmark) as previously reported [128,129]. Briefly, a 15-Å radius sphere centered on the binding sites of each protein structure in order to permit each ligand to search. In the case of the spike protein and human ACE2, the docking sphere was located at the interface between the spike protein and ACE2. In one case, ACE2 was removed and docking was carried out with the spike protein, and in the other case, the spike protein was removed and docking was carried out with ACE2. Standard protonation states of each protein, based on neutral pH, were used, and charges were assigned based on standard templates as part of the Molegro Virtual Docker program. Each protein was used as a rigid model without protein relaxation. Flexible-ligand models were used in the docking optimizations. Different orientations of the ligands were searched and ranked based on their “rerank” energy scores. A minimum of 100 runs for each ligand was carried out. In analyzing the docking scores, we accounted for the recognized bias due to molecular weight [130,131,132] using the scheme: DSnorm = 7.2 × Edock/MW⅓, where DSnorm is the normalized docking score, Edock is the MolDock re-rank score, MW is the molecular weight, and 7.2 is a scaling constant to ensure the average DSnorm values are comparable to those of Edock [128]. The best docking results are summarized in Table 1.\n\n4. Conclusions\nA molecular docking analysis was carried out using 171 essential oil components with the SARS-CoV-2 main protease (SARS-CoV-2 Mpro), SARS-CoV-2 endoribonucleoase (SARS-CoV-2 Nsp15/NendoU), SARS-CoV-2 ADP-ribose-1″-phosphatase (SARS-CoV-2 ADRP), SARS-CoV-2 RNA-dependent RNA polymerase (SARS-CoV-2 RdRp), the binding domain of the SARS-CoV-2 spike protein (SARS-CoV-2 rS), and human angiotensin-converting enzyme (hACE2). The best docking ligands for the SARS-CoV target proteins were (E,E)-α-farnesene, (E)-β-farnesene, and (E,E)-farnesol. The docking energies were relatively weak, however, and are unlikely to interact with the virus targets. However, essential oil components may act synergistically, essential oils may potentiate other antiviral agents, or they may provide some relief of COVID-19 symptoms.\n\nAcknowledgments\nW.N.S. participated in this work as part of the activities of the Aromatic Plant Research Center 237 (APRC, https://aromaticplant.org/).\n\nAuthor Contributions\nConceptualization, J.K.R.d.S., K.G.B., and W.N.S.; methodology, J.K.R.d.S., K.G.B., and W.N.S.; formal analysis, W.N.S.; investigation, J.K.R.d.S., P.L.B.F., K.G.B., and W.N.S.; data curation, W.N.S.; writing—original draft preparation, J.K.R.d.S. and W.N.S.; writing—review and editing, J.K.R.d.S., P.L.B.F., K.G.B., and W.N.S.; project administration, W.N.S.; All authors have read and agreed to the published version of the manuscript.\n\nFunding\nThis research received no external funding.\n\nConflicts of Interest\nThe authors declare no conflict of interest. Abbreviations\nAdeno Adenovirus\nAIV Avian influenza virus\nBaNadD Bacillus anthracis nicotinate mononucleotide adenylytransferase\nBtOBP Bovine odorant binding protein\nCOVID-19 Coronavirus disease 2019\nCox B1 Coxsackie B1 virus\nDENV-1 Dengue virus serotype 1\nDENV-2 Dengue virus serotype 2\nDENV-3 Dengue virus serotype 3\nDENV-4 Dengue virus serotype 4\nDrPLA2 Russell’s viper phospholipase A2\nDSnorm Normalized docking score\nEcAspTA Esherichia coli L-aspartate aminotransferase\nECHO 9 Echovirus 9\nhACE2 Human angiotensin-converting enzyme\nHeLa Human cervical tumor cells\nHEp-2 Human epithelial type 2 cells\nHRSV Human respiratory syncytial virus\nHSV-1 Herpes simplex virus 1\nHSV-2 Herpes simplex virus 2\nIC50 Median inhibitory concentration\nJUNV Junin virus\nMDCK Madin-Darby canine kidney cells\nMTT 3-(4,5-dimethylthiazol-2-yl)-2,5-diphenyltetrazolium bromide\nPCR Polymerase chain reaction\nPDB Protein data bank\nPolio 1 Poliomyelitis virus 1\nRC-37 African green monkey kidney cells\nSARS-CoV-2 2019 severe acute respiratory syndrome coronavirus 2\nTcAChE Torpedo acetylcholinesterase\nVero African green monkey kidney cells\nYFV Yellow fever virus\n\nFigure 1 Lowest-energy docked poses of (E)-β-farnesene and (E,E)-α-farnesene with the SARS-CoV-2 main protease (PDB: 6LU7). (A) Ribbon structure of the enzyme and (E)-β-farnesene. (B) Solid structure of the enzyme showing (E)-β-farnesene in the binding cleft. (C) Amino acid residues in proximity to the docked (E)-β-farnesene. (D) Lowest-energy docked pose of (E,E)-α-farnesene in the enzyme binding site.\nFigure 2 Lowest-energy docked poses of (E,E)-farnesol and (E)-nerolidol with the SARS-CoV-2 main protease (PDB: 6Y84). (A) Ribbon structure of the enzyme and (E,E)-farnesol (magenta) and (E)-nerolidol (orange). (B) Solid structure of the enzyme showing (E,E)-farnesol (magenta) and (E)-nerolidol (orange) in the binding cleft. (C) Important interactions of amino acid residues with (E,E)-farnesol. (D) Important interactions of amino acid residues with (E)-nerolidol. Hydrogen bonds are indicated with blue dashed lines.\nFigure 3 Lowest-energy docked poses of (E,E)-α-farnesene, (E)-β-farnesene, (E,E)-farnesol, and (E)-nerolidol with SARS-CoV-2 endoribonuclease (PDB: 6VWW). (A) Ribbon structure of the enzyme and (E,E)-α-farnesene (green), (E)-β-farnesene (aqua), (E,E)-farnesol (magenta), and (E)-nerolidol (orange). (B) Solid structure of the enzyme showing (E,E)-α-farnesene (green), (E)-β-farnesene (aqua), (E,E)-farnesol (magenta), and (E)-nerolidol (orange) in the binding cleft. (C) Lowest-energy docked pose of (E,E)-α-farnesene in the binding site. (D) Lowest-energy docked pose of (E)-β-farnesene in the binding site. (E) Lowest-energy docked pose of (E,E)-farnesol in the binding site. (F) Lowest-energy docked pose of (E)-nerolidol in the binding site. Hydrogen bonds are indicated with blue dashed lines.\nFigure 4 Lowest-energy docked pose of (E,E)-farnesol with SARS-CoV-2 ADP ribose phosphatase (PDB: 6W02). (A) Ribbon structure of the enzyme and the docked ligand. (B) Solid structure of the enzyme showing (E,E)-farnesol in the binding cleft. (C) Amino acid residues in proximity to the docked (E,E)-farnesol (hydrogen bonds are indicated with blue dashed lines).\nFigure 5 Lowest-energy docked poses of β-sesquiphellandrene, α-zingiberene, phytol, and phytone with SARS-CoV-2 ADP ribose phosphatase (PDB: 6W02). (A) Ribbon structure of the enzyme with β-sesquiphellandrene (brown) and α-zingiberene (yellow). (B) Ribbon structure of the enzyme with phytol (green) and phytone (red).\nFigure 6 Lowest-energy docked ligands with the binding domain of SARS-CoV-2 spike protein and human angiotensin-converting enzyme 2 (ACE2) (PDB: 6M17).\nTable 1 Essential oils showing antiviral activity.\nEssential Oil Major Components Assay IC50 (μg/mL) Reference\nAloysia gratissima (Gillies \u0026 Hook.) Tronc. caryophyllene oxide (15.8%), guaiol (17.4%) a, chrysanthenyl acetate (5.6%), and limonene oxide (5.3%) Plaque reduction assay (Vero cells), HSV-1 65.0 [37]\nAloysia triphylla Royle α-thujone (22.9%), cis−carveol (17.5%), carvone (13.2%), and limonene (12.7%) Plaque reduction assay (Vero cells), HSV-1 \u003e250 [38]\nArtemisia arborescens L. camphor (35.7%), β-thujone (24.0%), and chamazulene (7.7%) Plaque reduction assay (Vero cells), HSV-1 25% inhibition at 100 μg/mL [39]\nArtemisia arborescens L. Artemisia arborescens L. β-thujone (45.0%), camphor (6.8%), and chamazulene (22.7%) c Plaque reduction assay (Vero cells), HSV-1, HSV-2 2.4, 4.1 [40]\nArtemisia douglasiana Besser α-thujone (68.3%) and β-thujone (7.5%) Plaque reduction assay (Vero cells), HSV-1 83 [37]\nArtemisia kermanensis Podlech (syn. Seriphidium kermanense (Podlech) K. Bremer \u0026 Humphries α-thujone (13.8%), camphor (10.2%), and β-thujone (6.2%) Plaque reduction assay (Vero cells), HSV-1 40 [41]\nArtemisia mendozana DC. camphor (22.4%), artemiseole (11.7%), artemisia alcohol (10.8%), and borneol (7.2%) Plaque reduction assay, DENV−2, JUNV and HSV-1 129.3, 178.6, and 153.7 [38]\nArtemisia princeps Pamp. borneol (12.1%), α-thujone (8.7%), τ−cadinol, (6.7%), and 1,8-cineole (6.2%) Plaque reduction assay, murine norovirus−1 64% inhibition at 0.01% [42]\nPlaque reduction assay, feline calicivirus−F9 48% inhibition at 0.1%\nArtemisia vulgaris L. α-thujone (38.1%), β-thujone (10.6%), and 1,8-cineole (8.8%) Virus yield assay (Vero cells), yellow fever virus (YFV) 100 μg/mL (100% inhibition) [43]\nAyapana triplinervis (Vahl) R.M. King \u0026 H. Rob. thymohydroquinone dimethyl ether Plaque reduction assay (A549 cells), Zika virus 38.0 [44]\nBuddleja cordobensis Griseb. caryophyllene oxide (32.1%), β-caryophyllene (16.5%), and α-copaene (8.5%) Plaque reduction assay, DENV−2, JUNV and HSV-1 86.4, 39.0, and 54.1 [38]\nCedrus libani A. Rich. himachalol (22.5%), β-himachalene (21.9%), and α-himachalene (10.5%) Cytopathic effect (CPE) on Vero cells, HSV-1 440 [45]\nCinnamomum zeylanicum Blume (syn. Cinnamomum verum J. Presl) eugenol (75–85%), linalool (1.6−8.5%), (E)−cinnamaldehyde (0.6−1.5%), (E)−cinnamyl acetate (0.7–2.6%), β-caryophyllene (0.5–6.7%), eugenyl acetate (0.1–2.9%), and benzyl benzoate (0.1–8.3%) Influenza type A (H1N1) [46]\nCinnamomum zeylanicum Blume (syn. Cinnamomum verum J. Presl) (E)−cinnamaldehyde (63.9%), eugenol (7.0%), and (E)−cinnamyl acetate (5.1%) c Plaque reduction assay (HeLa cells), HSV-2 82 [47]\nCitrus × bergamia Risso \u0026 Poit. limonene (23–55%), linalool (2–37%), linalyl acetate (12–41%), β-pinene (up to 10%), and γ-terpinene (up to 10%) Influenza virus type A H1N1 100% inhibition at 0.3% [46]\nCitrus limonum Risso limonene (54.6%), γ-terpinene (19.1%), and β-pinene (14.5%) d Plaque reduction assay (Vero cells), HSV-1 2500 [48]\nCitrus reshni Hort ex Tan. (leaf EO) sabinene (40.5%), linalool (23.3%), and terpinen-4-ol (8.3%) Plaque reduction assay, influenza A virus H5N1 19.4% inhibition at 0.1 μL/mL [36]\nCitrus reshni Hort ex Tan. (unripe fruit peel EO) limonene (82.4%) and linalool (7.2%) Plaque reduction assay, influenza A virus H5N1 61.5% inhibition at 1.5 μL/mL [36]\nCitrus reshni Hort ex Tan. (ripe fruit peel EO) limonene (91.6%) Plaque reduction assay, influenza A virus H5N1 50% inhibition at 1.5 μL/mL [36]\nCupressus sempervirens L. α-pinene (51.9%) and δ-3-carene (24.9%) c Plaque reduction assay (Vero cells), HSV-1 6600 [48]\nCymbopogon citratus (DC.) Stapf geranial (40.2%), neral (30.6%), and geraniol (6.7%) c Plaque reduction assay (Vero cells), HSV-1 91 [48]\nCymbopogon flexuosus (Nees) Will. Watson geranial (48–54%) and neral (29–33%) Influenza virus type A (H1N1) [46]\nCynanchum stauntonii (Decne.) Schltr. ex H. Lév. (2E,4E)-decadienal (23.0%), γ-nonalactone (4.2%), 5-pentyl-2(3H)−furanone (3.8%), and 3-isopropyl-1-pentanol (3.5%) Influenza type A (H1N1) 64 [46]\nDysphania ambrosioides (L.) Mosyakin \u0026 Clemants cis-ascaridole (60.7%) and m-cymene (22.2%) Plaque reduction assay, Coxsackie virus B4 21.75 [49]\nEucalyptus astringens (Maiden) Maiden 1,8-cineole (42.0%), α-pinene (22.0%), and trans−pinocarveol (7.0%) Vero cells, Coxsakie virus B3 13.0 [50]\nEucalyptus bicostata Maiden, Blakely \u0026 Simmonds 1,8-cineole (68.0%), globulol (5.4%), and trans−pinocarveol (4.6%) Vero cells, Coxsakie virus B3 13.6 [50]\nEucalyptus caesia Benth. 1,8-cineole (40.2%), p-cymene (14.1%), γ-terpinene (12.4%), α-pinene (7.7%), and terpinen-4-ol (5.6%) Plaque reduction assay (Vero cells), HSV-1 70 [41]\nEucalyptus camaldulensis Dehnh. α-terpinene (26.3%), α-terpineol (9.1%), and camphene (8.5%) e Plaque reduction assay, Rotavirus Wa strain 50% inhibition at 10% EO concentration [51]\nEucalyptus camaldulensis Dehnh. α-terpinene (26.3%), α-terpineol (9.1%), and camphene (8.5%) e Plaque reduction assay, Coxsackie virus B4 53.3% at 10% EO concentration [51]\nEucalyptus camaldulensis Dehnh. α-terpinene (26.3%), α-terpineol (9.1%), and camphene (8.5%) e Plaque reduction assay, HSV-1 90% at 10% EO concentration [51]\nEucalyptus camaldulensis Dehnh. α-terpinene (26.3%), α-terpineol (9.1%), and camphene (8.5%) e Plaque reduction assay, adenovirus type 7 0% at 10% EO concentration [51]\nEucalyptus cinereal F. Muell. ex Benth. 1,8-cineole (70.4%), α-pinene (4.5%), and limonene (3.7%) Vero cells, Coxsakie virus B3 13.0 [50]\nEucalyptus globulus Labill. 1,8-cineole (63.8%) and α-pinene (14.0%) f Plaque reduction assay (Vero cells), HSV-1 1700 [48]\nEucalyptus globulus Labill. 1,8-cineole (63.8%) and α-pinene (14.0%) f Plaque reduction assay (RC-37 cells), HSV-1 55.0 [52]\nEucalyptus lehmannii (Schauer) Benth. 1,8-cineole (59.6%), α-pinene (17.6%), and α-terpineol (8.7%) Vero cells, Coxsakie virus B3 11.5 [50]\nEucalyptus leucoxylon F. Muell. 1,8-cineole (59.2%), α-pinene (7.8%), and α-terpineol (4.3%) Vero cells, Coxsakie virus B3 8.1 [50]\nEucalyptus maidenii F. Muell. 1,8-cineole (57.8%), p-cymene (7.4%), and α-pinene (7.3%) Vero cells, Coxsakie virus B3 14.5 [50]\nEucalyptus odorata Behr cryptone (20.9%), p-cymene (16.7%), phellandral (6.6%), and cuminal (6.6%) Vero cells, Coxsakie virus B3 19.2 [50]\nEucalyptus sideroxylon A. Cunn. ex Woolls 1,8-cineole (69.2%), α-pinene (6.9%), and α-terpineol (5.4%) Vero cells, Coxsakie virus B3 12.3 [50]\nEupatorium patens D. Don ex Hook. \u0026 Arn. germacrene D (36.2%), β-caryophyllene (14.1%), and bicyclogermacrene (7.0%) Plaque reduction assay (Vero cells), HSV-1 125 [37]\nFortunella margarita (Lour.) Swingle (leaf EO) α-terpineol (55.5%), carvone (5.7%), carveol (5.5%), γ-muurolene (5.5%), and citronellal (5.0%) MTT assay, reasserted avian influenza A virus, H5N1 6.77 [53]\nFortunella margarita (Lour.) Swingle (fruit EO) β-eudesmol (28.3%), α-muurolene (10.3%), β-gurjunene (10.0%), γ-eudesmol (8.4%), and γ-muurolene (6.6%) MTT assay, reasserted avian influenza A virus, H5N1 38.89 [53]\nGaillardia megapotamica (Spreng.) Baker β-pinene (24.2%), (Z)-β-ocimene (16.5%), α-pinene (7.7%), limonene (7.5%), and β-caryophyllene (6.7%) Plaque reduction assay, DENV−2, JUNV and HSV-1 140.6, 49.8, and 99.1 [38]\nHeterothalamus alienus (Spreng.) Kuntze β-pinene (35.5%), spathulenol (10.7%), and germacrene D (6.8%) Plaque reduction assay DENV−2, JUNV and HSV-1 122.3, 44.2 and 148.4 [38]\nHeterotheca latifolia Buckley borneol (40.0%), camphor (24.3%), and limonene (5.1%) Plaque reduction assay (Vero cells), HSV-1 \u003e150 [37]\nHouttuynia cordata Thunb. decanal (3.4−8.9%), decanol (up to 7.0%), 2−undecanone (23.0−36.1%), decanoic acid (1.4−6.3%), dodecanal (up to 7.3%), and 2−tridecanone (2.6−5.6%) Influenza type A (H1N1) 48 [54]\nHyptis mutabilis (Rich.) Briq. fenchone (17.1%), 1,8-cineole (12.6%), β-caryophyllene (10.9%), bicyclogermacrene (8.7%), and germacrene D (6.2%) Plaque reduction assay (Vero cells), HSV-2 (Human Herpesvirus type 1) 79.01 [55]\nHyptis mutabilis (Rich.) Briq. germacrene D (15.1%), β-caryophyllene (13.3%), curzerene (13.3%), and bicyclogermacrene (13.2%) Plaque reduction assay (Vero cells) \u003e150 [37]\nHyssopus officinalis L. cis−pinocamphone (40.1%), trans−pinocamphone (13.3%), β-pinene (10.7%), and β-phellandrene (5.3%) c Plaque reduction assay (RC-37 cells), HSV-1 1 [56]\nHyssopus officinalis L. cis−pinocamphone (40.1%), trans−pinocamphone (13.3%), β-pinene (10.7%), and β-phellandrene (5.3%) c Plaque reduction assay (RC-37 cells), HSV-2 6 [57]\nIllicium verum Hook. f. (E)−anethole (90.5%) c Plaque reduction assay (RC-37 cells), HSV-1 40 [58]\nIllicium verum Hook. f. (E)−anethole (90.5%) c Plaque reduction assay (RC-37 cells), HSV-1 1 [59]\nIllicium verum Hook. f. (E)−anethole (90.5%) c Plaque reduction assay (RC-37 cells), HSV-2 30 [57]\nJungia polita Griseb. caryophyllene oxide (9.2%) and β-caryophyllene (8.1%) Plaque reduction assay DENV−2, JUNV and HSV-1 39.8, 134.2 and 136.4 [38]\nJuniperus communis L. α-pinene (46.7%), myrcene (15.0%), sabinene (13.2%), and limonene (7.0%) c Plaque reduction assay (Vero cells), HSV-1 \u003e10000 [48]\nLavandula angustifolia Mill. linalyl acetate (37.0−43.6%), linalool (19.7−39.1%), geraniol (up to 9.3%), β-caryophyllene (up to 5.1%), terpinene−4−ol (up to 14.9%), lavandulol (up to 1.5%), lavandulyl acetate (up to 5.5%), 1,8-cineole (up to 4.1%), and borneol (up to 6.4%) 85% in vitro inhibition of influenza type A (H1N1) [46]\nLavandula latifolia Medik. linalool (31.9%), 1,8-cineole (18.8%), and borneol (10.1%) g Plaque reduction assay (Vero cells), HSV-1 2200 [48]\nLepechinia salviifolia (Kunth) Epling camphor (10.3%), limonene (9.7%), p−mentha−1(7),8−diene (7.4%), α-pinene (6.9%), and γ-terpinene (6.7%) Plaque reduction assay (Vero cells), HSV-1, HSV-2 68.8, 81.9 [55]\nLepechinia vulcanicola J.R.I. Wood limonene (18.9%), germacrene D (10.4%), 1−octen−3−ol (8.8%), β-caryophyllene (8.7%), and α-pinene (8.2%) Plaque reduction assay (Vero cells), HSV-1, HSV-2 112, 68.9 [55]\nLeptospermum scoparium J.R. Forst. \u0026 G. Forst. calamene (16.0%), leptospermone (14.5%), δ−cadinene (6.1%), flavesone (4.5%), viridiflorene (4.4%), and isoleptospermone (3.9%) Plaque reduction assay (RC-37 cells), HSV-1, HSV-2 0.96, 0.58 [60]\nLippia alba (Mill.) N.E. Br. ex Britton \u0026 P. Wilson carvone (51.0%), Limonene (33%), and bicyclosesquiphellandrene (7.0%) Virus yield assay (Vero cells), yellow fever virus (YFV) 100 μg/mL (100% inhibition) [43]\nLippia alba (Mill.) N.E. Br. ex Britton \u0026 P. Wilson carvone (39.7%), limonene (30.6%), and bicyclosesquiphellandrene (8.9%) Plaque reduction assay (Vero cells), DENV−1, DENV−2, DENV−3, DENV−4, YFV 17 DD 10.1, 0.4, 32.6, 21.1, 4.9 [61]\nLippia alba (Mill.) N.E. Br. ex Britton \u0026 P. Wilson carvone (39.7%), limonene (30.6%), and bicyclosesquiphellandrene (8.9%) Plaque reduction assay (Vero cells), Yellow fever (YFV) 4.3 [62]\nLippia citriodora Kunth (syn. Aloysia citriodora Palau) geranial (18.9%), neral (15.6%), limonene (10.7%), and 1,8-cineole (5.0) Plaque reduction assay (Vero cells), DENV−1, DENV−2, DENV−3, DENV−4, YFV 17 DD 1.9, 2.9, 2.6, 33.7, 5.7 [61]\nLippia citriodora Kunth (syn. Aloysia citriodora Palau) geranial (18.9%), neral (15.6%), limonene (10.7%), and 1,8-cineole (5.0) Plaque reduction assay (Vero cells), Yellow fever (YFV) 19.4 [62]\nLippia graveolens Kunth carvacrol (56.8%), o−cymene (32.1%), and γ-terpinene (3.7%) h MTT assay (Mardin−Darby bovine kidney cells), HSV-1, ACVR−HSV-1 (acyclovir−resistant HSV-1), HRSV (human respiratory syncytial virus) 99.6, 55.9, 68.0 [63]\nLippia junelliana (Moldenke) Tronc. piperitenone oxide (= rotundifolone) (36.5%), limonene (23.1%), camphor (7.9%), and spathulenol (6.5%) Plaque reduction assay (Vero cells), HSV-1 \u003e150 [37]\nLippia origanoides carvacrol (44.0%), thymol (15.0%), and γ-terpinene (10.0%) Virus yield assay (Vero cells), yellow fever virus (YFV) 11.1 μg/mL (100% inhibition) [43]\nLippia turbinata Griseb. limonene (60.6%), piperitenone oxide (17.4%), and β-caryophyllene (6.4%) Plaque reduction assay (Vero cells), HSV-1 \u003e 150 [37]\nMatricaria recutita L. α-bisabolol oxide A (13.4–55.9%), α-bisabolol oxide B (8.4–25.1%), bisabolone oxide A (2.9–11.4%), cis−bicycloether (= (Z)−spiroether) (3.6–17.7%), and (E)-β-farnesene (1.9–10.4%) i Plaque reduction assay (RC-37 cells), HSV-1 0.3 [58]\nMatricaria recutita L. α-bisabolol oxide A (13.4–55.9%), α-bisabolol oxide B (8.4–25.1%), bisabolone oxide A (2.9−11.4%), cis−bicycloether (= (Z)−spiroether) (3.6–17.7%), and (E)-β-farnesene (1.9–10.4%) i Plaque reduction assay (RC-37 cells), HSV-2 1.5 [57]\nMelaleuca alternifolia Cheel terpinen-4-ol (36.71%), γ-terpinene (22.20%), and α-terpinene (10.10%) Plaque reduction assay, influenza A⁄PR ⁄ 8 virus subtype H1N1 60 [31]\nMelaleuca alternifolia Cheel terpinen-4-ol (30–48%), γ-terpinene (10–28%), α-terpinene (5–13%), 1,8-cineole (up to 15%), terpinolene (1.5−5%), p-cymene (0.5–12%), α-pinene (1–6%), and α-terpineol (1.5–8%) 100% inhibition of influenza type A (H1N1) virus at 0.01%; type A (H11N9) virus to tea tree oil vapor caused 100% inhibition [46]\nMelaleuca alternifolia Cheel terpinen-4-ol (47.5%), γ-terpinene (20.2%), and α-terpinene (8.6%) c Plaque reduction assay (Vero cells), HSV-1 2700 [48]\nMelaleuca alternifolia Cheel terpinen-4-ol (47.5%), γ-terpinene (20.2%), and α-terpinene (8.6%) c Plaque reduction assay (Vero cells), HSV-1 13.2 [64]\nMelaleuca alternifolia Cheel terpinen-4-ol (47.5%), γ-terpinene (20.2%), and α-terpinene (8.6%) c Plaque reduction assay (RC-37 cells), HSV-1 2 [52]\nMelaleuca alternifolia Cheel terpinen-4-ol (47.5%), γ-terpinene (20.2%), and α-terpinene (8.6%) c Plaque reduction assay (HeLa cells), HSV-2 2700 [47]\nMelaleuca alternifolia Cheel terpinen-4-ol (47.5%), γ-terpinene (20.2%), and α-terpinene (8.6%) c Plaque reduction assay (Vero cells), HSV-1 significant plaque reduction at 10 and 5% v/v [65]\nMelaleuca armillaris (Sol. ex Gaertn.) Sm. 1,8-cineole (33.9%), terpinen-4-ol (18.8%), and γ-terpinene (10.4%) Plaque reduction assay (Vero cells), HSV-1 99% plaque reduction (concentration not given) [66]\nMelaleuca ericifolia Sm. methyl eugenol (96.84%) Plaque reduction assay (Vero cells), HSV-1 91.5% plaque reduction (concentration not given) [66]\nMelaleuca leucadendra (L.) L. 1,8-cineole (64.3%), α-terpineol (11.0%), and valencene (3.91%) Plaque reduction assay (Vero cells), HSV-1 92% plaque reduction (concentration not given) [66]\nMelissa officinalis L. neral (17−32%), geranial (23–43%), linalool (up to 9.0%), citronellal (0.7–20.3%), geraniol (up to 23.2%), β-caryophyllene (up to 11.3%), and caryophyllene oxide (0.4−31.7%) influenza A virus (H9N2) Significant reduction at 5 μg/mL [46]\nMelissa officinalis L. β-cubebene (15.4%), β-caryophyllene (14.2%), α-cadinol (7.2%), geranial (6.6%), and neral (5.8%) Plaque reduction assay (HEp−2 cells), HSV-2 21 [67]\nMelissa officinalis L. geranial (20.1%), β-caryophyllene (17.3%), and neral (13.6%) Plaque reduction assay (RC-37 cells), HSV-1, HSV-2 4, 0.8 [68]\nMentha × piperita L. menthol (42.8%), menthone (14.6%), and isomenthone (5.9%) Plaque reduction assay (RC-37 cells), HSV-1, HSV-2 20, 8 [69]\nMentha × piperita L. menthol (43.8%), menthone (19.7%), menthyl acetate (6.5%), and 1,8-cineole (5.0%) c Plaque reduction assay (Vero cells), HSV-1 2200 [48]\nMentha suaveolens Ehrh. limonene (7.4%), isopulegol (12.0%), and piperitenone oxide (41.8%) Plaque reduction assay, cytopathogenic murine norovirus 0.87 [70]\nMentha suaveolens Ehrh. piperitenone oxide (86.9%) Plaque reduction assay (Vero cells), HSV-1 5.1 [64]\nMinthostachys mollis Griseb. cis−piperitone epoxide (29.9%), piperitenone oxide (25.6%), menthone (7.4%), germacrene D (5.8%), and pulegone (5.5%) Plaque reduction assay (Vero cells), HSV-1, HSV-2 70.7, 68.0 [55]\nOcimum basilicum var. album (L.) Benth. linalool (53.8%) and eugenol (12.6%) j Plaque reduction assay (Vero cells), HSV-1 \u003e10000 [48]\nOcimum campechianum Mill. methyl eugenol (53.9%), β-caryophyllene (13.0%), α-bulnesene (5.4%), germacrene D (3.4%), and α-humulene (3.3%) Plaque reduction assay (Vero cells), HSV-2 74.33 [55]\nOriganum elongatum Emb. (leaf EO) p-cymene (16.2%), γ-terpinene (13.5%), thymol (14.2%), and carvacrol (19.2%) Plaque reduction assay, cytopathogenic murine norovirus 0.37 [70]\nOriganum elongatum Emb. (inflorescence EO) p-cymene (16.1%), γ-terpinene (7.3%), and carvacrol (40.1%), Plaque reduction assay, cytopathogenic murine norovirus 0.75 [70]\nOriganum majorana L. terpinen-4-ol (28.9%), γ-terpinene (14.9%), trans−sabinene hydrate (9.5%), α-terpinene (8.7%), and sabinene (7.2%) c Plaque reduction assay (Vero cells), HSV-1 2800 [48]\nOriganum majorana L. terpinen-4-ol (28.9%), γ-terpinene (14.9%), trans−sabinene hydrate (9.5%), α-terpinene (8.7%), and sabinene (7.2%) c Plaque reduction assay (HeLa cells), HSV-2 520 [47]\nOriganum vulgare L. trans−sabinene hydrate (21.0%), thymol (11.0%), and carvacrol methyl ether (11.0%) Virus yield assay (Vero cells), yellow fever virus (YFV) 100 μg/mL (100% inhibition) [43]\nOsmunda regalis L. hexahydrofarnesyl acetone ( = phytone) (11.8%), 2,4−di−t−butylphenol (6.8%), phytol (6.5%), hexadecene (4.1%), and octadecene (4.4%) Plaque reduction assay, Coxsackie virus B4 type 2 2.24 [71]\nPectis odorata Griseb. limonene (50.2%), neral (27.2%), and geranial (23.6%) Plaque reduction assay DENV−2, JUNV and HSV-1 39.6, 36.6, and 71.5 [38]\nPelargonium graveolens L’Hér. ex Aiton citronellol (21.9–37.5%), citronellyl formate (9.8–20.6%), geraniol (6.0–16.5%), geranyl formate (1.5–6.5%), menthone (up to 13%), isomenthone (up to 9.9%), and linalool (0.8−14.9%) influenza type A (H1N1) 95% inhibition at 0.3% [46]\nPinus mugo Turra δ-3-carene (23.9%), α-pinene (17.9%), β-pinene (7.8%), and β-phellandrene (7.2%) k Plaque reduction assay (RC-37 cells), HSV-1 7 [58]\nRavensara aromatica Sonn. (syn. Cryptocarya agathophylla van der Werff) 1,8-cineole (52.6%), α-terpineol (12.4%), and sabinene (11.0%) l Plaque reduction assay (Vero cells), HSV-1 2800 [48]\nRosmarinus officinalis L. α-pinene (23.9%), verbenone (15.4%), camphor (11.0%), camphene (8.7%), p-cymene (7.5%), and 3−octanone (5.6%) Plaque reduction assay (Vero cells), HSV-1 60 [41]\nRosmarinus officinalis L. 1,8-cineole (45.9%), α-pinene (12.0%), camphor (10.9%), and β-pinene (6.3%) b Plaque reduction assay (Vero cells), HSV-1 2700 [48]\nSalvia fruticosa Mill. 1,8-cineole (47.5%), camphor (9.0%), β-thujone (7.6%), and α-thujone (4.3%) Plaque reduction assay (Vero cells), HSV-1 and HSV-2 1300 [72]\nSantalum album L. (Z)−α-santalol (45.2%), (Z)-β-santalol (25.4%), and (Z)−trans−α-bergamotol (7.8%) c Plaque reduction assay (Vero cells), HSV-1, HSV-2 22.7, 45.3 [73]\nSantalum album L. (Z)−α-santalol (45.2%), (Z)-β-santalol (25.4%), and (Z)−trans−α-bergamotol (7.8%) c Plaque reduction assay (RC-37 cells), HSV-1 2 [56]\nSantalum album L. (Z)−α-santalol (45.2%), (Z)-β-santalol (25.4%), and (Z)−trans−α-bergamotol (7.8%) c Plaque reduction assay (RC-37 cells), HSV-2 5 [57]\nSantolina insularis (Gennari ex Fiori) Arrigoni artemisia ketone (21.2%), allo−aromadendrene (12.7%), 1,8-cineole (9.0%), and camphene (8.5%) m Plaque reduction assay (Vero cells), HSV-1 and HSV-2 0.88, 0.7 [74]\nSatureja hortensis L. carvacrol (32.4%), γ-terpinene (32.0%), thymol (10.0%), and p-cymene (6.6%) Plaque reduction assay (Vero cells), HSV-1 80 [41]\nTessaria absinthioides (Hook. \u0026 Arn.) DC. caryophyllene oxide (12.2%), (E)-β-damascenone, γ-eudesmol (8.5%), α-gurjunene (5.8%), and terpinen-4-ol (5.4%) Plaque reduction assay (Vero cells), HSV-1 105 [37]\nThymus capitatus (L.) Hoffmanns. \u0026 Link (unripe fruit EO) carvacrol (68.6%), p-cymene (4.8%), γ-terpinene (3.0%), and β-caryophyllene (2.9%) Plaque reduction assay, cytopathogenic murine norovirus 0.49 [70]\nThymus capitatus (L.) Hoffmanns. \u0026 Link (ripe fruit EO) carvacrol (58.8%), p-cymene (5.6%), γ-terpinene (2.8%), and β-caryophyllene (2.6%) Plaque reduction assay, cytopathogenic murine norovirus 0.50 [70]\nThymus vulgaris L. thymol (31–50%), p-cymene (0.1–26.6%), and γ-terpinene (up to 22.8%) 100% inhibition of type A (H1N1) virus at 0.3% concentration [46]\nThymus vulgaris L. thymol (43.9%), carvacrol (14.4%), p-cymene (10.5%), β-caryophyllene (7.0%), and γ-terpinene (5.1%) c Plaque reduction assay (RC-37 cells), HSV-1 10 [56]\nThymus vulgaris L. thymol (43.9%), carvacrol (14.4%), p-cymene (10.5%), β-caryophyllene (7.0%), and γ-terpinene (5.1%) c Plaque reduction assay (RC-37 cells), HSV-1 11 [52]\nThymus vulgaris L. thymol (43.9%), carvacrol (14.4%), p-cymene (10.5%), β-caryophyllene (7.0%), and γ-terpinene (5.1%) c Plaque reduction assay (RC-37 cells), HSV-2 7 [57]\nThymus willdenowii Boiss. 1,8-cineole (34.62%), camphor (18.55%), α-pinene (9.46%), and camphene (5.38%) Plaque reduction assay, Coxsackie virus Inactive [75]\nTrachyspermum ammi (L.) Sprague thymol (35–60%), α-pinene, p-cymene, and limonene Plaque reduction assay, Japanese encephalitis virus 80% reduction at 500 μg/mL [76]\nZataria multiflora Boiss. thymol (47.3%), carvacrol (21.9%), p-cymene (8.6%), γ-terpinene (4.2%), and β-caryophyllene (3.0%) Real time PCR (H9N2 subtype of AIV) Reduced viral replication in trachea of broiler chickens [77]\nZataria multiflora Boiss. thymol (33.1%), carvacrol (25.9%), and p-cymene (11.3%) Plaque reduction assay (Vero cells), HSV-1 30 [41]\nZingiber officinale Roscoe α-zingiberene (32.1%), ar−curcumene (15.2%), β-sesquiphellandrene (10.9%), α-farnesene (7.2%), and α-phellandrene (4.4%) Plaque reduction assay, Caprine alphaherpesvirus type I not determined [78]\nZingiber officinale Roscoe α-zingiberene (26.4%), camphene (12.6%), β-sesquiphellandrene (9.2%), ar−curcumene (6.5%), β-phellandrene (6.2%), and β-bisabolene (5.1%) c Plaque reduction assay (RC-37 cells), HSV-1 2 [56]\nZingiber officinale Roscoe α-zingiberene (26.4%), camphene (12.6%), β-sesquiphellandrene (9.2%), ar−curcumene (6.5%), β-phellandrene (6.2%), and β-bisabolene (5.1%) c Plaque reduction assay (RC-37 cells), HSV-2 1 [57]\na Reported as cadinol, but see [79,80]. b Essential oil composition not reported; essential oil composition obtained from [81]. c Essential oil composition not reported; essential oil composition of commercial (dōTERRA International, Pleasant Grove, Utah, USA). d Essential oil composition not reported; essential oil composition obtained from [82]. e Essential oil composition not reported; essential oil composition obtained from [83]. f Essential oil composition not reported; essential oil composition obtained from [84]. g Essential oil composition not reported; essential oil composition obtained from [85]. h Essential oil composition not reported; essential oil composition obtained from [86]. i Essential oil composition not reported; essential oil composition obtained from [87]. j Essential oil composition not reported; essential oil composition obtained from [88]. k Essential oil composition not reported; essential oil composition obtained from [89]. l Essential oil composition not reported; essential oil composition obtained from [90]. m Essential oil composition not reported; essential oil composition obtained from [91].\nTable 2 Antiviral activities of essential oil components.\nEssential Oil Component Assay IC50 (μg/mL) Reference\n(E)−Anethole Plaque reduction assay (RC-37 cells), HSV-1 20 [59]\nCamphor Plaque reduction assay (Vero cells), HSV-1 2600 [72]\nCarvacrol MTT assay (Mardin−Darby bovine kidney (MDBK) cells, HSV-1 48.6 [63]\nβ-Caryophyllene Plaque reduction assay (RC-37 cells), HSV-1 0.25 [59]\nCaryophyllene oxide Plaque reduction assay (RC-37 cells), HSV-1 0.7 [59]\n1,8-Cineole Plaque reduction assay (Vero cells), HSV-1 1800 [72]\n1,8-Cineole Plaque reduction assay (RC-37 cells), HSV-1 1200 [52]\n(E)-Cinnamaldehyde Influenza type A (H1N1) virus 70% at a concentration of 0.53% after 3 h [95]\n(E)-Cinnamaldehyde H1N1 in-vivo by inhalation in a mouse model 89% inhibition [95]\nCitral (Geranial + Neral) Yellow fever (YFV), Vero cells 17.6 [62]\nCitral (Geranial + Neral) Plaque reduction assay (RC-37 cells), HSV-1 3.50 [52]\np-Cymene Influenza, HSV-1, HSV-2, ECHO 9, Cox B1, Polio 1, Adeno 6 \u003e500 [31]\np-Cymene Plaque reduction assay (RC-37 cells), HSV-1 16 [52]\np-Cymene Influenza type A (H1N1) virus Inactive [25]\nDodecanal Influenza type A (H1N1) virus 51 [54]\nβ-Eudesmol Plaque reduction assay (Vero cells), HSV-1 6 [59]\nEugenol Plaque reduction assay (RC-37 cells), HSV-1 35 [59]\nEugenol Plaque reduction assay (RC-37 cells), HSV-1 25.6 [96]\nFarnesol Plaque reduction assay (RC-37 cells), HSV-1 3.5 [59]\nGermacrone Influenza type A (H1N1) virus 1.22–1.55 [97]\nGermacrone Influenza type A (H3N2) virus 0.34 [97]\nGermacrone Influenza type B virus 1.38 [97]\nIsoborneol Plaque reduction assay (Vero cells), HSV-1 \u003c1000 [98]\nNerolidol (natural) Plaque reduction assay (RC-37 cells), HSV-1 4.2 [99]\nNerolidol (synthetic) Plaque reduction assay (RC-37 cells), HSV-1 1.5 [99]\nOctanal Influenza type A (H1N1) virus 15 [54]\nPatchouli alcohol Influenza type A (H1N1) 89% inhibition at 10 μg/mL [100]\nPatchouli alcohol Influenza type A (H2N2) 0.89 [101]\nPatchouli alcohol Influenza type A (H2N2), in-vivo test using a mouse model 70% survival rate at a dose of 5 mg/(kg day) [101]\nα-Pinene Plaque reduction assay (RC-37 cells), HSV-1 4.5 [52]\nPiperitenone oxide Plaque reduction assay (Vero cells) 1.4 [64]\nα-Terpinene Influenza type A (H1N1) virus Inactive [25]\nα-Terpinene Influenza, HSV-1, HSV-2, ECHO 9, Cox B1, Polio 1, Adeno 4 \u003e12 [31]\nα-Terpinene Plaque reduction assay (RC-37 cells), HSV-1 8.5 [52]\nγ-Terpinene Plaque reduction assay (RC-37 cells), HSV-1 7 [52]\nγ-Terpinene Influenza, HSV-1, HSV-2, ECHO 9, Cox B1, Polio 1, Adeno 5 \u003e120 [31]\nγ-Terpinene influenza type A (H1N1) virus inactive [25]\nTerpinen-4-ol Influenza, HSV-1, HSV-2, ECHO 9, Cox B1, Polio 1, Adeno 2 25 (influenza)\u003e50 (others) [31]\nTerpinen-4-ol Plaque reduction assay (Vero cells), HSV-1 60 [52]\nα-Terpineol Plaque reduction assay (RC-37 cells), HSV-1 22 [52]\nTerpinolene Influenza, HSV-1, HSV-2, ECHO 9, Cox B1, Polio 1, Adeno 3 12 (influenza)\u003e12 (others) [31]\nThujones (α \u0026 β) Plaque reduction assay (RC-37 cells), HSV-1 400 [72]\nThymol Influenza type A (H1N1) virus Active [25]\nThymol Plaque reduction assay (RC-37 cells), HSV-1 30 [52]\n2-Undecanone influenza type A (H1N1) virus 62 [54]\nTable 3 Docking scores, normalized for molecular weight (DSnorm, kJ/mol), of essential oil components with severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) molecular targets.\nCompound MainProtease Endoribo-Nuclease ADP RibosePhosphatase RNA-DependentRNA Polymerase Spike ProteinBinding Domain Angiotensin-Converting Enzyme a\n(E)-Anethole −84.9 −83.0 −97.5 −74.0 −65.2 −83.8\nallo-Aromadendrene −86.6 −86.9 −95.8 −74.9 −66.1 −85.3\nArtemiseole −89.2 −83.4 −96.6 −73.0 −67.8 −78.0\n(R)-Artemisia alcohol −84.3 −78.3 −88.2 −66.8 −61.1 −74.7\n(S)-Artemisia alcohol −86.1 −85.4 −98.5 −69.5 −67.1 −77.4\nArtemisia ketone −91.0 −85.7 −97.9 −71.9 −66.9 −77.3\nAscaridole −74.8 −68.2 −86.0 −65.2 −62.6 −64.4\nBenzyl benzoate −104.9 −96.5 −110.3 −82.5 −74.9 −96.4\n(Z)-trans-α-Bergamotol −98.0 −91.2 −105.9 −71.9 −63.6 −83.6\nBicyclogermacrene −85.9 −88.0 −92.5 −75.6 −68.2 −86.1\nBicyclosesquiphellandrene −79.4 −89.6 −86.0 −61.8 −62.5 −78.2\nα-Bisabolol oxide A −88.5 −87.6 −89.1 −71.5 −63.5 −89.7\nα-Bisabolol oxide B −96.6 −92.2 −101.0 −79.7 −75.2 −95.6\nBisabolone oxide A −93.7 −87.9 −98.2 −73.3 −71.0 −78.7\n(+)-Borneol −77.4 −91.8 −100.1 −74.1 −70.9 −73.3\n(−)-Borneol −71.4 −71.5 −78.4 −56.7 −50.1 −73.7\n(+)-iso-Borneol −75.6 −75.3 −75.9 −60.8 −53.2 −71.8\n(−)-iso-Borneol −73.8 −69.2 −75.6 −54.8 −49.3 −72.4\nα-Bulnesene −95.2 −72.4 −78.4 −57.0 −57.8 −101.7\nδ-Cadinene −91.6 −90.2 −112.6 −75.2 −60.0 −93.4\nτ-Cadinol −92.3 −82.8 −82.5 −69.9 −69.8 −87.8\n(R)-Calamene −92.3 −83.5 −97.4 −69.0 −65.6 −87.3\n(S)-Calamene −88.4 −86.8 −95.9 −70.2 −64.7 −87.5\n(+)-Camphene −85.6 −78.9 −83.2 −64.4 −57.9 −72.2\n(−)-Camphene −77.2 −74.1 −87.1 −66.0 −59.8 −67.1\n(+)-Camphor −75.2 −73.1 −77.9 −63.9 −53.8 −69.4\n(−)-Camphor −72.5 −70.0 −75.6 −64.3 −52.8 −70.8\n(+)-δ-3-Carene −87.9 −78.6 −87.0 −65.0 −72.4 −75.8\n(−)-δ-3-Carene −83.9 −88.0 −90.4 −66.8 −67.3 −73.4\nCarvacrol −84.5 −86.6 −94.8 −74.1 −71.0 −81.2\nCarvacrol methyl ether −85.5 −82.5 −103.1 −74.6 −65.8 −83.7\n(+)-cis−Carveol −87.0 −81.8 −97.7 −76.5 −69.7 −80.4\n(−)-cis−Carveol −85.6 −85.0 −95.6 −76.8 −74.3 −81.2\n(R)-Carvone −87.7 −82.4 −98.2 −74.7 −69.2 −83.4\n(S)-Carvone −86.2 −83.2 −98.9 −73.2 −66.3 −82.2\n(E)-Caryophyllene −81.2 −82.2 −93.9 −73.4 −59.2 −75.1\nCaryophyllene oxide −80.6 −86.7 −97.0 −74.1 −66.5 −83.3\nCedrol −82.3 −84.4 −80.1 −69.7 −58.3 −69.9\nepi-Cedrol −76.4 −88.4 −92.2 −68.5 −55.5 −75.9\nChamazulene −97.6 −96.4 −110.9 −76.9 −73.7 −95.6\n(−)-cis-Chrystanthyl acetate −83.2 −77.5 −87.1 −71.5 −60.2 −80.9\n(−)-trans−Chrysanthenyl acetate −77.0 −81.4 −85.3 −65.9 −68.9 −72.4\n1,8-Cineole −72.7 −67.6 −71.5 −58.1 −58.6 −61.0\n(E)-Cinnamaldehyde −93.1 −85.8 −100.0 −76.4 −73.1 −81.0\n(E)-Cinnamyl acetate −99.4 −88.0 −108.9 −76.9 −80.6 −89.5\n(R)-Citronellal −99.9 −91.6 −105.0 −75.1 −73.3 −88.0\n(S)-Citronellal −98.3 −88.9 −107.4 −72.1 −71.4 −86.2\n(R)-Citronellol −99.9 −90.2 −104.9 −75.7 −72.3 −84.9\n(S)-Citronellol −99.2 −92.2 −107.6 −74.2 −77.4 −85.1\n(R)-Citronellyl formate −105.5 −92.6 −109.9 −72.8 −76.2 −90.5\n(S)-Citronellyl formate −101.5 −96.4 −114.7 −81.9 −78.3 −91.0\nα-Copaene −84.1 −78.9 −85.9 −60.2 −59.6 −77.1\nCostunolide −94.5 −99.2 −110.2 −78.2 −74.9 −92.6\n(R)-Cryptone −86.6 −82.4 −93.5 −68.2 −70.4 −74.8\n(S)-Cryptone −81.5 −82.9 −94.9 −69.8 −70.6 −76.6\nβ-Cubebene −90.8 −92.0 −86.7 −76.0 −71.2 −89.8\nCuminaldehyde −86.2 −80.5 −103.3 −74.9 −67.5 −81.7\nar-Curcumene −105.3 −94.0 −108.6 −82.8 −75.8 −96.4\nCurcumol −83.0 −93.4 −91.2 −73.5 −69.6 −86.0\nCurdione −86.2 −98.1 −99.0 −77.3 −71.7 −92.0\nCurzerene −91.5 −86.0 −104.2 −76.8 −67.6 −90.5\nm-Cymene −83.6 −81.3 −92.8 −72.0 −67.6 −79.0\no-Cymene −83.2 −78.3 −87.7 −63.9 −63.3 −72.9\np-Cymene −79.7 −78.7 −91.0 −70.3 −63.9 −75.4\n(E)-β-Damascenone −85.2 −87.6 −110.2 −73.8 −73.8 −84.8\n(2E,4E)-Decadienal −105.7 −97.7 −112.5 −81.8 −78.7 −90.0\nDodecanal −102.8 −93.9 −101.9 −77.9 −73.3 −94.9\nEremanthin −97.7 −97.7 −98.0 −83.7 −81.3 −100.9\nβ-Eudesmol −97.6 −87.4 −106.5 −75.8 −64.5 −74.7\nγ-Eudesmol −93.6 −89.9 −94.7 −69.4 −66.1 −84.3\nEugenol −93.2 −91.7 −105.2 −80.0 −79.1 −88.4\nEugenol methyl ether −88.5 −85.3 −111.1 −71.7 −68.6 −89.3\nEugenyl acetate −96.3 −89.3 −115.1 −75.6 −70.6 −94.9\n(E,E)-α-Farnesene −115.0 −107.5 −112.8 −86.8 −85.3 −100.3\n(E)-β-Farnesene −115.4 −105.0 −116.3 −87.1 −82.9 −100.7\n(E,E)-Farnesol −112.4 −104.6 −121.4 −89.6 −80.8 −100.9\n(+)-Fenchone −80.0 −80.9 −87.1 −66.1 −60.8 −66.9\n(-)-Fenchone −83.3 −67.5 −86.2 −66.5 −60.9 −68.8\nFlavesone −82.3 −84.0 −95.7 −68.9 −64.4 −78.9\nGeranial −101.7 −90.8 −113.0 −76.1 −74.5 −92.0\nGeraniol −103.5 −98.5 −110.2 −77.4 −76.4 −93.8\nGeranyl formate −105.9 −93.9 −111.4 −80.8 −80.3 −96.2\nGermacrene D −92.1 −96.7 −110.5 −77.1 −73.0 −87.3\nGermacrone −85.1 −97.1 −94.9 −71.6 −67.1 −80.9\nGuiaol −94.1 −92.5 −113.4 −79.2 −79.4 −91.9\nα-Gurjunene −89.9 −83.2 −81.3 −71.5 −61.3 −79.8\nβ-Gurjunene −77.4 −64.1 −81.1 −64.1 −58.0 −75.1\nα-Himachalene −80.4 −89.7 −86.5 −63.7 −67.9 −74.3\nβ-Himachalene −85.5 −81.3 −88.6 −68.1 −62.9 −77.2\nHimachalol −77.2 −88.3 −100.8 −63.6 −63.7 −75.6\nα-Humulene −88.9 −90.9 −89.1 −74.9 −70.6 −86.7\nLeptospermone −85.5 −83.2 −92.9 −71.2 −64.1 −80.0\niso-Leptospermone −86.1 −82.7 −93.7 −69.1 −62.6 −83.5\n(R)-Limonene −82.2 −76.2 −92.0 −72.6 −67.3 −79.0\n(S)-Limonene −82.2 −73.8 −92.2 −72.4 −66.1 −77.5\n(R,S,R)-Limonene oxide −86.3 −77.7 −100.8 −76.7 −68.1 −85.1\n(S,R,R)-Limonene oxide −83.5 −87.4 −89.4 −66.7 −63.4 −76.4\n(S,R,S)-Limonene oxide −84.7 −80.7 −95.8 −74.9 −66.7 −83.8\n(R)-Linalool −96.0 −89.3 −101.4 −70.9 −79.0 −87.0\n(S)-Linalool −100.7 −87.5 −102.1 −71.4 −70.4 −87.8\n(R)-Linalyl acetate −101.4 −88.9 −105.1 −73.0 −74.3 −82.5\n(S)-Linalyl acetate −102.8 −90.8 −106.0 −68.5 −74.5 −82.3\np-Mentha-1(7),8-diene −82.3 −82.2 −94.3 −69.5 −65.9 −79.3\n(+)-Menthol −82.9 −86.2 −95.0 −71.8 −66.6 −77.7\n(-)-Menthol −82.3 −84.5 −95.1 −71.1 −69.2 −79.4\nMenthone −83.2 −77.8 −94.7 −69.3 −70.0 −74.4\niso-Menthone −81.0 −79.8 −97.6 −64.4 −63.5 −80.1\nα-Muurolene −86.9 −81.9 −96.9 −72.0 −66.0 −83.7\n(+)-γ-Muurolene −82.3 −82.9 −83.1 −72.2 −66.6 −84.4\n(-)-γ-Muurolene −88.4 −86.2 −106.7 −74.5 −68.5 −86.8\nMyrcene −98.7 −90.1 −102.2 −74.9 −71.4 −84.3\nNeral −102.6 −91.8 −110.5 −81.5 −72.4 −91.2\n(E)-Nerolidol −110.7 −101.4 −113.8 −83.5 −76.1 −100.6\n(E)-β-Ocimene −97.0 −90.2 −103.6 −76.3 −75.6 −86.7\n(Z)-β-Ocimene −98.3 −88.7 −103.2 −78.6 −73.9 −85.1\nOctanal −89.7 −83.8 −99.5 −71.3 −72.4 −80.5\n(R)-2-Octen-3-ol −88.1 −88.4 −96.6 −71.9 −70.7 −81.9\n(S)-1-Octen-3-ol −94.2 −90.7 −93.4 −77.1 −74.7 −80.0\n3-Octanone −88.9 −85.3 −94.7 −71.7 −72.9 −80.3\nPatchouli alcohol −63.5 −57.1 −66.7 −51.8 −43.0 −67.9\n(R)-Phellandral −87.6 −85.9 −102.5 −74.4 −66.2 −81.1\n(S)-Phellandral −87.7 −83.7 −101.6 −74.4 −66.5 −79.2\n(R)-α-Phellandrene −81.1 −82.9 −92.5 −70.1 −65.3 −76.4\n(S)-α-Phellandrene −81.6 −82.5 −92.3 −69.7 −65.6 −76.6\n(R)-β-Phellandrene −84.4 −83.7 −94.0 −69.8 −65.5 −75.2\n(S)-β-Phellandrene −82.9 −84.5 −94.0 −71.2 −67.5 −77.7\nPhytol −106.3 −94.2 −118.9 −74.9 −75.6 −93.3\nPhytone −106.4 −94.3 −116.9 −79.8 −72.3 −90.4\n(+)-α-Pinene −79.0 −70.7 −79.7 −59.4 −54.6 −63.7\n(-)-α-Pinene −77.3 −70.4 −72.9 −61.3 −54.7 −63.6\n(+)-β-Pinene −76.8 −71.8 −79.4 −63.7 −53.0 −65.2\n(-)-β-Pinene −78.8 −73.6 −73.9 −61.9 −56.1 −64.7\n(+)-Pinocamphone −74.9 −72.6 −79.4 −63.2 −62.4 −66.4\n(-)-Pinocamphone −73.2 −79.3 −81.8 −62.0 −61.4 −67.2\n(+)-iso-Pinocamphone −74.9 −75.0 −74.9 −66.6 −55.1 −66.5\n(-)-iso-Pinocamphone −77.1 −80.7 −77.5 −64.0 −55.6 −68.3\n(+)-cis-Pinocarveol −73.9 −78.1 −79.5 −67.7 −57.4 −70.2\n(-)-cis-Pinocarveol −74.1 −76.5 −78.8 −67.0 −58.6 −66.3\n(+)-trans-Pinocarveol −74.7 −80.5 −78.7 −65.8 −57.2 −70.6\n(-)-trans-Pinocarveol −77.6 −80.0 −82.6 −60.5 −55.5 −70.8\n(+)-Piperitone oxide −82.0 −81.5 −98.5 −66.2 −65.2 −77.8\n(-)-Piperitone oxide −81.6 −83.9 −94.9 −68.6 −60.8 −82.8\n(-)-iso-Pulegol −82.5 −85.1 −98.8 −75.2 −66.7 −79.3\n(R)-Pulegone −84.0 −83.1 −96.1 −66.4 −65.5 −78.3\n(S)-Pulegone −83.6 −78.6 −93.3 −67.2 −66.2 −78.9\nRotundifolone −83.1 −79.0 −96.6 −66.4 −62.1 −80.7\n(+)-Sabinene −86.4 −84.0 −92.2 −70.5 −68.6 −77.4\n(-)-Sabinene −87.8 −85.9 −94.7 −71.5 −69.6 −77.0\ncis-Sabinene hydrate −82.4 −81.1 −92.4 −68.0 −60.8 −78.2\n(Z)-α-Santalol −105.7 −95.3 −108.8 −84.7 −70.7 −95.8\n(E)-β-Santalol −104.8 −95.6 −106.2 −77.0 −70.9 −86.6\n(Z)-β-Santalol −104.4 −94.4 −106.2 −79.8 −73.2 −92.2\nβ-Sesquiphellandrene −103.8 −99.0 −115.7 −84.8 −75.3 −101.1\nSpathulenol −90.7 −88.0 −98.4 −77.8 −67.9 −90.4\n(Z)-Spiroether −111.8 −84.9 −103.1 −87.1 −79.3 −102.0\nγ-Terpinene −81.3 −79.3 −93.2 −71.2 −65.3 −76.6\n(R)-Terpinen-4-ol −80.4 −81.9 −89.5 −69.0 −64.9 −75.3\n(S)-Terpinen-4-ol −82.1 −81.8 −88.0 −70.4 −64.4 −76.4\n(R)-α-Terpineol −82.6 −88.3 −91.6 −65.6 −66.0 −72.6\n(S)-α-Terpineol −88.7 −86.8 −94.1 −71.6 −63.5 −82.0\nTerpinolene −80.7 −80.1 −94.7 −68.8 −63.9 −77.4\n(-)-α-Thujone −87.2 −89.3 −94.5 −66.9 −69.2 −78.1\n(+)-β-Thujone −86.9 −80.5 −94.2 −73.7 −69.7 −79.2\nThymohydroquinone dimethyl ether −89.5 −82.8 −104.6 −73.1 −67.0 −85.0\nThymol −84.4 −87.5 −94.6 −72.9 −70.8 −78.4\n2-Undecanone −101.3 −94.0 −108.3 −78.4 −72.8 −90.2\nValencene −84.7 −81.7 −92.6 −74.4 −68.3 −81.7\n(+)-Verbenone −84.7 −73.2 −82.5 −68.4 −54.8 −71.2\n(-)-Verbenone −83.8 −77.7 −77.4 −65.4 −57.8 −68.0\nViridiflorene −86.8 −90.2 −91.0 −76.3 −69.4 −88.8\nα-Zingiberene −106.4 −100.5 −115.4 −82.7 −71.4 −98.6\na Human angiotensin-converting enzyme 2 (hACE2).\nTable 4 Normalized docking scores ( DSnorm, kJ/mol) of essential oil components with bovine odorant binding protein (BtOBP), cruzain, torpedo acetylcholinesterase (TcAChE), Bacillus anthracis nicotinate mononucleotide adenylytransferase (BaNadD), Russell’s viper phospholipase A2 (DrPLA2), and Escherichia coli l-aspartate aminotransferase (EcAspTA).\nCompound BtOBP Cruzain TcAChE BaNadD DrPLA2 EcAspTA\n1GT3 1ME3 6G1U 3HFJ 1FV0 2Q7W\n(E)-Anethole −90.2 −73.3 −96.8 −112.9 −85.3 −88.1\nallo-Aromadendrene −85.0 −70.6 −92.8 −105.8 −87.8 −79.6\nArtemiseole −84.8 −74.2 −84.2 −90.6 −68.0 −71.7\n(R)-Artemisia alcohol −88.4 −68.3 −89.5 −94.8 −80.7 −81.5\n(S)-Artemisia alcohol −86.1 −74.0 −94.8 −101.4 −82.5 −81.4\nArtemisia ketone −93.1 −77.3 −91.5 −107.9 −87.8 −80.6\nAscaridole −79.7 −54.4 −72.1 −79.7 −75.0 −65.3\nBenzyl benzoate −105.0 −82.8 −115.8 −128.1 −97.3 −89.9\n(Z)-trans-α-Bergamotol −1 00.7 −73.6 −107.0 −94.2 −92.6 −85.8\nBicyclogermacrene −97.5 −82.4 −95.6 −105.5 −89.7 −89.0\nBicyclosesquiphellandrene −92.2 −52.5 −91.2 −110.7 −88.4 −75.7\nα-Bisabolol oxide A −94.7 −66.1 −102.8 −102.6 −77.1 −82.7\nα-Bisabolol oxide B −104.6 −90.4 −107.0 −121.9 −94.2 −89.8\nBisabolone oxide A −100.1 −71.9 −96.8 −84.7 −81.2 −86.7\n(+)-Borneol −72.5 −51.0 −72.0 −47.8 −61.4 −62.5\n(-)-Borneol −78.3 −53.1 −70.8 −49.0 −63.3 −56.2\n(+)-iso-Borneol −73.7 −55.6 −74.6 −31.0 −60.9 −59.7\n(-)-iso-Borneol −73.2 −55.3 −77.7 −52.6 −51.0 −57.4\nα-Bulnesene −93.4 −89.3 −109.3 −115.7 −94.4 −95.3\nδ-Cadinene −79.5 −86.8 −105.1 −116.8 −94.8 −82.3\nΤ-Cadinol −87.8 −71.8 −117.7 −121.7 −86.0 −87.0\n(R)-Calamene −80.3 −84.4 −116.5 −120.4 −91.3 −87.7\n(S)-Calamene −80.1 −82.5 −116.2 −121.8 −93.0 −88.3\n(+)-Camphene −79.0 −62.1 −77.0 −75.9 −69.3 −67.5\n(-)-Camphene −77.7 −62.8 −75.2 −77.4 −71.3 −70.6\n(+)-Camphor −76.0 −57.0 −75.0 −49.0 −53.5 −54.1\n(-)-Camphor −80.0 −54.1 −74.4 −52.9 −61.2 −56.4\n(+)-δ-3-Carene −80.4 −64.2 −80.6 −88.0 −71.8 −72.5\n(-)-δ-3-Carene −82.0 −68.9 −84.4 −90.2 −72.8 −72.9\nCarvacrol −82.4 −77.7 −94.8 −106.7 −81.6 −87.5\nCarvacrol methyl ether −85.6 −79.3 −96.6 −111.5 −84.2 −93.6\n(+)-cis-Carveol −89.1 −77.3 −96.9 −109.4 −81.3 −87.6\n(-)-cis-Carveol −89.0 −82.1 −95.5 −109.0 −83.2 −89.4\n(R)-Carvone −86.0 −80.7 −94.6 −109.9 −83.5 −91.5\n(S)-Carvone −88.0 −77.2 −94.1 −105.9 −82.8 −87.2\n(E)-Caryophyllene −87.3 −60.4 −88.1 −87.3 −87.4 −78.6\nCaryophyllene oxide −95.1 −73.1 −90.1 −97.0 −83.8 −77.8\nCedrol −87.7 −63.1 −96.4 −84.4 −86.3 −70.9\nepi-Cedrol −84.0 −59.7 −83.3 −86.7 −80.0 −76.2\nChamazulene −95.2 −89.2 −123.0 −132.1 −98.9 −101.6\n(-)-cis-Chrystanthyl acetate −85.8 −63.7 −89.8 −73.8 −76.5 −71.5\n(-)-trans-Chrysanthenyl acetate −80.9 −69.7 −82.4 −78.5 −76.5 −68.6\n1,8-Cineole −69.3 −51.1 −73.2 −54.4 −49.4 −47.3\n(E)-Cinnamaldehyde −87.7 −77.6 −98.2 −110.1 −85.7 −89.5\n(E)-Cinnamyl acetate −95.9 −88.2 −107.4 −132.5 −94.6 −103.1\n(R)-Citronellal −98.1 −90.5 −109.3 −120.7 −88.3 −105.7\n(S)-Citronellal −95.0 −89.7 −108.5 −123.3 −86.9 −104.1\n(R)-Citronellol −91.0 −90.0 −108.2 −122.4 −88.6 −107.7\n(S)-Citronellol −92.5 −91.9 −108.5 −122.0 −90.3 −100.3\n(R)-Citronellyl formate −98.0 −93.5 −118.7 −129.5 −87.5 −108.5\n(S)-Citronellyl formate −99.7 −95.1 −111.2 −135.6 −91.5 −94.8\nα-Copaene −88.9 −69.9 −84.6 −78.7 −81.7 −61.9\nCostunolide −106.8 −87.5 −116.7 −120.1 −100.3 −89.1\n(R)-Cryptone −74.9 −68.1 −92.2 −100.0 −78.5 −80.8\n(S)-Cryptone −79.0 −68.5 −91.6 −100.7 −82.7 −79.6\nβ-Cubebene −99.8 −67.2 −106.9 −112.2 −93.9 −94.8\nCuminaldehyde −84.9 −79.1 −95.3 −109.1 −90.1 −89.5\nar-Curcumene −98.1 −87.5 −116.0 −125.7 −94.1 −95.3\nCurcumol −90.1 −67.6 −100.4 −88.0 −87.6 −81.5\nCurdione −96.4 −75.1 −99.3 −116.3 −91.0 −78.7\nCurzerene −96.4 −80.3 −109.4 −89.7 −91.1 −86.4\nm-Cymene −78.9 −73.1 −96.1 −99.1 −76.6 −88.0\no-Cymene −77.0 −61.9 −89.8 −97.8 −76.2 −77.2\np-Cymene −82.8 −73.2 −91.3 −96.8 −80.9 −84.3\n(E)-β-Damascenone −90.1 −80.5 −100.7 −105.4 −88.9 −80.0\n(2E,4E)-Decadienal −96.4 −87.0 −110.4 −129.7 −95.8 −114.8\nDodecanal −95.8 −83.7 −110.3 −127.3 −89.2 −108.9\nEremanthin −80.1 −87.9 −121.3 −132.4 −98.7 −91.8\nβ-Eudesmol −95.2 −76.1 −98.6 −114.1 −85.3 −87.1\nγ-Eudesmol −94.9 −78.2 −106.1 −105.2 −89.7 −89.1\nEugenol −90.4 −82.4 −103.9 −119.3 −87.3 −98.8\nEugenol methyl ether −93.6 −78.1 −106.3 −116.8 −89.3 −94.4\nEugenyl acetate −94.9 −83.4 −109.2 −126.1 −100.1 −104.6\n(E,E)-α-Farnesene −115.5 −103.7 −129.8 −131.8 −101.2 −111.4\n(E)-β-Farnesene −112.1 −103.2 −122.7 −131.8 −105.3 −108.6\n(E,E)-Farnesol −116.8 −96.2 −133.0 −135.6 −100.5 −109.0\n(+)-Fenchone −78.4 −60.5 −79.5 −79.8 −62.4 −69.9\n(-)-Fenchone −80.3 −61.5 −81.0 −84.2 −65.5 −60.7\nFlavesone −87.1 −56.0 −88.6 −92.1 −85.2 −80.3\nGeranial −96.5 −94.9 −111.7 −119.3 −92.1 −101.5\nGeraniol −95.5 −93.6 −109.7 −118.0 −94.3 −107.3\nGeranyl formate −100.2 −89.7 −115.4 −128.3 −94.8 −114.1\nGermacrene D −102.4 −88.8 −109.9 −116.5 −93.7 −90.0\nGermacrone −92.4 −68.3 −94.5 −102.9 −88.3 −80.0\nGuiaol −100.8 −88.5 −113.3 −107.5 −92.6 −94.0\nα-Gurjunene −80.6 −61.6 −84.6 −100.0 −83.6 −78.1\nβ-Gurjunene −89.3 −38.8 −80.3 11.3 −77.6 −71.1\nα-Himachalene −89.2 −67.9 −83.9 −96.3 −87.6 −73.4\nβ-Himachalene −81.9 −65.4 −96.1 −110.8 −91.4 −76.8\nHimachalol −91.5 −64.1 −81.2 −24.7 −81.7 −66.3\nα-Humulene −94.0 −80.0 −89.9 −113.6 −89.2 −82.5\nLeptospermone −89.6 −64.0 −92.2 −102.7 −88.8 −80.7\niso-Leptospermone −92.8 −63.0 −90.1 −99.4 −86.2 −78.2\n(R)-Limonene −86.2 −75.7 −92.4 −99.6 −81.7 −86.8\n(S)-Limonene −84.9 −77.6 −93.4 −99.8 −83.3 −87.3\n(R,S,R)-Limonene oxide −87.1 −76.0 −93.2 −110.7 −84.9 −86.3\n(S,R,R)-Limonene oxide −84.6 −68.8 −85.0 −84.3 −76.2 −69.8\n(S,R,S)-Limonene oxide −91.2 −73.8 −97.4 −93.6 −85.1 −87.9\n(R)-Linalool −95.5 −89.9 −116.6 −112.4 −90.3 −89.9\n(S)-Linalool −93.0 −88.9 −110.1 −111.9 −91.0 −95.7\n(R)-Linalyl acetate −96.9 −87.1 −107.1 −112.5 −87.1 −95.2\n(S)-Linalyl acetate −100.0 −90.5 −110.2 −114.3 −86.6 −87.1\np-Mentha-1(7),8-diene −83.3 −74.4 −93.6 −100.0 −82.9 −84.9\n(+)-Menthol −86.1 −66.4 −98.6 −106.1 −79.2 −90.8\n(-)-Menthol −81.0 −68.9 −97.5 −106.3 −80.5 −89.7\nMenthone −82.4 −72.0 −92.6 −98.2 −82.8 −83.5\niso-Menthone −79.9 −64.8 −88.2 −102.4 −75.1 −82.0\nα-Muurolene −91.2 −79.9 −95.6 −113.7 −90.0 −82.8\n(+)-γ-Muurolene −85.2 −77.0 −98.7 −113.9 −93.2 −78.7\n(-)-γ-Muurolene −83.1 −83.4 −96.9 −106.3 −82.9 −80.5\nMyrcene −90.4 −88.8 −109.0 −112.7 −90.3 −101.1\nNeral −95.1 −94.1 −111.1 −122.8 −90.9 −105.4\n(E)-Nerolidol −111.5 −101.8 −131.9 −131.3 −99.6 −110.5\n(E)-β-Ocimene −91.8 −89.4 −104.6 −116.4 −89.0 −97.0\n(Z)-β-Ocimene −89.7 −90.6 −106.8 −112.1 −90.3 −94.4\nOctanal −85.8 −79.8 −97.6 −112.0 −85.7 −102.7\n(R)-2-Octen-3-ol −84.3 −81.5 −106.9 −107.1 −83.3 −101.1\n(S)-1-Octen-3-ol −84.5 −82.4 −108.4 −105.9 −85.0 −99.5\n3-Octanone −84.2 −82.5 −102.6 −111.6 −82.9 −101.8\nPatchouli alcohol −75.1 −41.4 −71.1 100.1 −10.1 −49.2\n(R)-Phellandral −92.3 −79.3 −97.4 −108.1 −88.9 −89.5\n(S)-Phellandral −92.9 −79.9 −96.1 −109.2 −88.9 −88.8\n(R)-α-Phellandrene −84.0 −69.7 −94.7 −100.8 −82.4 −83.8\n(S)-α-Phellandrene −84.3 −69.6 −93.5 −99.4 −82.6 −80.6\n(R)-β-Phellandrene −82.2 −69.9 −93.5 −102.0 −80.6 −84.1\n(S)-β-Phellandrene −83.8 −69.0 −93.2 −100.5 −80.2 −81.2\nPhytol −112.8 −93.8 −132.4 −134.7 −102.4 −112.9\nPhytone −117.8 −92.1 −124.5 −131.1 −99.7 −107.2\n(+)-α-Pinene −74.2 −58.0 −73.4 −62.4 −62.5 −54.4\n(-)-α-Pinene −72.8 −58.3 −70.4 −64.6 −61.7 −57.2\n(+)-β-Pinene −70.9 −57.8 −74.0 −64.1 −60.9 −55.5\n(-)-β-Pinene −73.5 −58.4 −73.1 −65.0 −63.7 −57.0\n(+)-Pinocamphone −76.5 −58.2 −73.6 −53.1 −55.4 −63.6\n(-)-Pinocamphone −76.6 −66.1 −76.5 −65.9 −72.3 −62.7\n(+)-iso-Pinocamphone −75.3 −59.0 −76.6 −54.0 −59.1 −58.1\n(-)-iso-Pinocamphone −76.2 −59.6 −76.7 −56.4 −65.8 −56.2\n(+)-cis-Pinocarveol −75.7 −58.2 −75.2 −51.7 −57.5 −58.1\n(-)-cis-Pinocarveol −75.7 −63.9 −73.5 −52.5 −66.3 −54.5\n(+)-trans-Pinocarveol −77.5 −60.6 −76.5 −71.1 −63.9 −61.4\n(-)-trans-Pinocarveol −72.4 −58.6 −77.2 −71.4 −56.3 −62.6\n(+)-Piperitone oxide −88.5 −70.5 −100.5 −104.2 −80.4 −78.0\n(-)-Piperitone oxide −86.0 −73.6 −99.6 −104.5 −80.7 −83.8\n(-)-iso-Pulegol −85.1 −72.0 −93.5 −106.7 −83.5 −93.8\n(R)-Pulegone −81.8 −69.9 −90.3 −103.9 −78.4 −74.4\n(S)-Pulegone −79.7 −69.6 −89.3 −99.9 −81.5 −76.4\nRotundifolone −86.1 −72.1 −96.1 −100.0 −82.4 −72.1\n(+)-Sabinene −87.9 −66.6 −84.5 −92.1 −80.5 −78.2\n(-)-Sabinene −79.7 −68.4 −91.4 −96.0 −80.8 −75.8\ncis-Sabinene hydrate −88.1 −70.2 −84.5 −91.1 −72.3 −68.1\n(Z)-α-Santalol −108.5 −85.6 −113.4 −106.8 −96.8 −90.7\n(E)-β-Santalol −105.0 −90.2 −110.6 −113.3 −94.3 −94.0\n(Z)-β-Santalol −108.0 −85.3 −110.4 −110.9 −96.5 −92.6\nβ-Sesquiphellandrene −103.9 −92.2 −116.6 −127.5 −99.4 −98.3\nSpathulenol −95.9 −94.8 −97.7 −102.8 −84.3 −102.2\n(Z)-Spiroether −112.8 −85.5 −124.3 −136.1 −101.5 −102.9\nγ-Terpinene −84.3 −74.9 −93.4 −98.7 −82.8 −85.9\n(R)-Terpinen-4-ol −87.3 −66.7 −81.5 −94.0 −80.2 −72.2\n(S)-Terpinen-4-ol −87.1 −67.2 −78.9 −92.3 −80.2 −71.7\n(R)-α-Terpineol −82.0 −68.0 −80.3 −82.2 −77.6 −71.3\n(S)-α-Terpineol −76.9 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Oils as Antiviral Agents, Potential of Essential Oils to Treat SARS-CoV-2 Infection: An In-Silico Investigation\n\nAbstract\nEssential oils have shown promise as antiviral agents against several pathogenic viruses. In this work we hypothesized that essential oil components may interact with key protein targets of the 2019 severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2). A molecular docking analysis was carried out using 171 essential oil components with SARS-CoV-2 main protease (SARS-CoV-2 Mpro), SARS-CoV-2 endoribonucleoase (SARS-CoV-2 Nsp15/NendoU), SARS-CoV-2 ADP-ribose-1″-phosphatase (SARS-CoV-2 ADRP), SARS-CoV-2 RNA-dependent RNA polymerase (SARS-CoV-2 RdRp), the binding domain of the SARS-CoV-2 spike protein (SARS-CoV-2 rS), and human angiotensin−converting enzyme (hACE2). The compound with the best normalized docking score to SARS-CoV-2 Mpro was the sesquiterpene hydrocarbon (E)-β-farnesene. The best docking ligands for SARS−CoV Nsp15/NendoU were (E,E)-α-farnesene, (E)-β-farnesene, and (E,E)−farnesol. (E,E)−Farnesol showed the most exothermic docking to SARS-CoV-2 ADRP. Unfortunately, the docking energies of (E,E)−α-farnesene, (E)-β-farnesene, and (E,E)−farnesol with SARS-CoV-2 targets were relatively weak compared to docking energies with other proteins and are, therefore, unlikely to interact with the virus targets. However, essential oil components may act synergistically, essential oils may potentiate other antiviral agents, or they may provide some relief of COVID-19 symptoms.\n\n1. Introduction\nThe 2019 severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) is a newly emerging respiratory illness. The epidemic started in December 2019 in Wuhan, China, and has rapidly spread throughout China and the world and is now a global pandemic. SARS-CoV-2 can be efficiently transmitted among humans and has shown a high degree of morbidity and mortality [1,2]. As of April 20, 2020, the worldwide number of infected individuals was 2,544,792, with as many as 175,694 deaths [3]. There are currently no approved vaccines available for the prevention of SARS-CoV-2 infection and only just recently, remdesivir has received “emergency use authorization” for treatment of COVID-19 in the United States; therefore, there is an urgent demand for potential chemotherapeutic agents to treat this disease.\nEssential oils have been screened against several pathogenic viruses (Table 1), including influenza and other respiratory viral infections. Influenza is an infectious respiratory disease caused by one of three types of influenza viruses, type A, type B, or type C [4]. The most significant in terms of human morbidity and mortality is influenza virus type A, which is found in several bird and mammal species [5]. Several different serotypes of influenza type A have caused global flu pandemics [6]: H1N1, which caused the Spanish flu in 1918 (40–50 million deaths worldwide) [7] and the swine flu in 2009 [8]; the Asian flu of 1957–1958 (ca. 1.5 million deaths worldwide) was caused by influenza A H2N2 [8]; serotype H3N2 caused the Hong Kong flu in 1968 [9]; and H5N1, which caused the bird flu in 2004 [10]. Influenza virus type B, however, is largely confined to human hosts [11].\nOne study evaluated the in vitro antiviral effect against influenza type A (H1N1) of commercial essential oils that included cinnamon (Cinnamomum zeylanicum), bergamot (Citrus bergamia), lemongrass (Cymbopogon flexuosus), thyme (Thymus vulgaris), and lavender (Lavandula angustifolia). The oils were tested in the liquid phase at a concentration of 0.3% and in the vapor phase. The oils of cinnamon, bergamot, thyme, and lemongrass displayed 100% inhibition of H1N1 in the liquid phase, while the inhibition for lavender essential oil was 85%. However, in the vapor phase, 100% inhibition was observed only for cinnamon leaf essential oil after 30 min of exposure. The bergamot, lemongrass, thyme, and lavender essential oils displayed inhibition rates of 95%, 90%, 70%, and 80%, respectively [12].\nCinnamomum zeylanicum leaf oil is characterized by eugenol (75–85%), followed by smaller amounts of linalool (1.6–8.5%), and benzyl benzoate (0.1–8.3%) [13,14,15]. Bergamot oil is rich in limonene (23–55%), linalool (2–37%), and linalyl acetate (12–41%), with lesser quantities of β-pinene (up to 10%) and γ-terpinene (up to 10%) [16,17,18,19,20]. Geranial (48–54%) and neral (29–33%) have been reported as the major components of C. flexuosus, but many chemotypes, cultivars, and variants have been reported for C. flexuosus [21,22].\nIn the literature, there have been at least 20 different chemotypes identified for thyme essential oil. The “typical” thyme essential oil presents a thymol content of 45% (range 31–50%), with significant concentrations of p-cymene (0.1–26.6%, average = 15.6%) and γ-terpinene (up to 22.8%, average = 9.3%). In addition, there are several other chemotypes of T. vulgaris rich in thymol and/or carvacrol [23]. Thymol has been identified as an anti-influenza agent against influenza type A and parainfluenza type 3 virus [24,25]. Lavandula angustifolia essential oil is rich in linalyl acetate (37.0–43.6%), linalool (19.7–39.1%), geraniol (up to 9.3%), β-caryophyllene (up to 5.1%), terpinen-4-ol (up to 14.9%), lavandulyl acetate (up to 5.5%), and borneol (up to 6.4%) [26,27,28,29].\nAnother essential oil with notable anti-influenza effects is tea tree, which is extracted from the leaves of Melaleuca alternifolia (Myrtaceae). Commercial tea tree oil is composed of terpinen-4-ol (30–48%), γ-terpinene (10–28%), α-terpinene (5–13%), 1,8-cineole (up to 15%), terpinolene (1.5–5%), p-cymene (0.5–12%), α-pinene (1–6%), and α-terpineol (1.5–8%) [30]. Tea tree oil showed 100% inhibition of influenza type A (H1N1) virus at 0.01% concentration and a median inhibitory concentration (IC50) of 6 μg/mL [31,32]. In addition, 30 min exposure of type A (H11N9) virus to tea tree oil vapor caused 100% inhibition [33]. The tea tree oil components, terpinen-4-ol, terpinolene, and α-terpineol, have shown anti-influenza virus activity against type A (H1N1), with IC50 values of 25, 12, and 250 μg/mL, respectively. α-Terpinene, γ-terpinene, and p-cymene were inactive, however [31].\nAvian influenza viruses (H5N1) exhibit both high and low virulence in numerous mammalian species, highlighting the connection between the route of inoculation and virus pathogenicity [34]. Since 2003, there have been over 600 documented cases of human infection with H5N1 viruses, with most cases among young, previously healthy individuals [35]. The essential oils extracted from Citrus reshni leaves and peel (unripe and ripe fruits) were tested against H5N1 virus by plaque reduction assay. The oils showed moderate inhibition of the H5N1 virus at a concentration of 2.5 μL/mL. Sabinene (40.5%), linalool (23.3%), and terpinen-4-ol (8.3%) were the main constituents in the leaf oil while limonene (82.4%, 91.6%) was the main compound in the fruit peel essential oils (unripe and ripe, respectively) [36].\nThe essential oil of leaves of Fortunella margarita is rich in the sesquiterpenoids β-eudesmol (28.3%), α-muurolene (10.3%), β-gurjunene (10.0%), γ-eudesmol (8.4%), and γ-muurolene (6.6%) while the essential oil extracted from the fruits showed monterpenoids as the main components, α-terpineol (55.5%), carvone (5.7%), and carveol (5.5%). Both samples were tested for antiviral activity against avian influenza (H5N1) virus, and the obtained results revealed that the fruit essential oil was more effective (80% virus inhibition by the MTT (3-(4,5-dimethylthiazol-2-yl)-2,5-diphenyltetrazolium bromide) assay using Madin−Darby canine kidney (MDCK) cells for virus propagation). The IC50 values obtained for the leaf and fruit essential oils were 38.89 and 6.77 μg/mL, respectively [53].\nDengue fever, a mosquito−borne disease, is caused by dengue virus (DENV) which includes four major serotypes (DENV-1, -2, -3, and -4). Some serotypes cause more severe diseases than others; severe dengue is associated with secondary infections by a different serotype. Dengue disease is a major public health problem in developing tropical countries and has being continuously spreading to new geographical areas [92]. The essential oils of two species of Lippia were assayed against four dengue serotypes (DENV-1, DENV-2, DENV-3, DENV-4) [61]. The IC50 values for Lippia alba oil, rich in carvone (39.7%), limonene (30.6%), and bicyclosesquiphellandrene (8.9%), were between 0.4 and 32.6 μg/mL. However, the Lippia citrodora essential oil, composed of geranial (18.9%), neral (15.6%), limonene (10.7%), and 1,8-cineole (5.0%), showed the best activity, with IC50 values varying from 1.9 to 33.7 μg/mL. No viral inhibitory effect was observed by addition of the essential oil after virus adsorption; the inhibitory effect of the essential oil seemed to cause direct virus inactivation before adsorption on the host cell.\nThe essential oils of seven aromatic plants from Córdoba, San Luis, and San Juan provinces (Argentina) were screened for cytotoxicity and in vitro inhibitory activity against dengue virus type 2 (DENV−2) [38]. The oils of Jungia polita and Buddleja cordobensis were composed of caryophyllene oxide (9.18%, 32.1%) and β-caryophyllene (8.13%, 16.5%) as the major compounds. However, these oils displayed different IC50 values (86.4 and 39.8 μg/mL, respectively). The other samples were composed mostly of monoterpenes and displayed lower activity, except Pectis odorata oil, which presented limonene (50.2%), neral (27.2%), and geranial (23.6%) as the major compounds and an IC50 value of 39.6 μg/mL. In addition, the essential oils of Artemisia mendozana, rich in camphor (22.4%), artemisole (11.7%), and artemisia alcohol (10.8%); Gailardia megapotamica composed of β-pinene (35.5%), spathulenol (10.7%), and germacrene D (6.8%); and Heterothalamus alienus characterized by β-pinene (35.5%), spathulenol (10.7%), and germacrene D (6.8%), showed an average IC50 value of 130.63 μg/mL.\nYellow fever (YF), caused by yellow fever virus (YFV), has historically been considered one of the most dangerous infectious diseases. YFV is transmitted to humans via mosquitoes of the Haemogogus, Sabethes, and Aedes genera. Annually, there are approximately 80,000–200,000 YFV cases worldwide, with a case fatality rate (CFR) ranging from 20–60% [93,94]. Essential oils of Lippia species and their main compounds have been tested against yellow fever virus (YFV) in Vero cells. The oil of Lippia origanoides showed carvacrol (44.0%), thymol (15.0%), and γ-terpinene (10.0%) as the main compounds and displayed 100% inhibition at a concentration of 11.1 μg/mL [43]. However, in the same study, the oil of L. alba displayed 100% inhibition at a concentration of 100.0 μg/mL. The major compounds were carvone (51.0%), limonene (33.0%), and bicyclosesquiphellandrene (7.0%). The essential oil of L. alba with a similar chemical composition, carvone (39.7%), limonene (30.6%), and bicyclosesquiphellandrene (8.9%), displayed an IC50 value of 4.3 μg/mL against YFV when tested in Vero cells using the MTT assay [62]. The essential oil of L. citriodora, dominated by geranial (18.9%), neral (15.6%), and limonene (10.7%), did not display a statistical difference in comparison to citral, with IC50 values of 19.4 and 17.6 μg/mL, respectively [62].\nIn addition to essential oils, several individual essential oil components have been screened for antiviral activity (Table 2).\nBecause of the activities of several essential oils and essential oil components against human pathogenic viruses, we hypothesized that essential oil components may be potentially useful as antiviral agents against SARS-CoV-2. In this work, we carried out a molecular docking analysis of the major components of essential oils that exhibit antiviral activity (Table 1 and Table 2) with known SARS-CoV-2 protein targets.\n\n2. Results and Discussion\nSeveral proteins have been identified for severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2), which may serve as potential targets for chemotherapeutic intervention in coronavirus disease 2019 (COVID-19). These protein targets include SARS-CoV-2 main protease (SARS-CoV-2 Mpro), SARS-CoV-2 endoribonucleoase (SARS-CoV-2 Nsp15/NendoU), SARS-CoV-2 ADP−ribose−1″−phosphatase (SARS-CoV-2 ADRP), SARS-CoV-2 RNA-dependent RNA polymerase (SARS-CoV-2 RdRp), the binding domain of the SARS-CoV-2 spike protein (SARS-CoV-2 rS), and human angiotensin−converting enzyme (hACE2). There have already been several molecular docking studies on these macromolecular targets. Several groups have carried out molecular docking of natural product libraries with SARS-CoV-2 Mpro [102,103,104,105]. Additionally, commercially available drugs have also been examined using in silico methods [106,107].\nA molecular docking study was carried out with 171 essential oil components with SARS-CoV-2 Mpro (PDB: 5R7Z, 5R80, 5R81, 5R82, 5R83, 5R84, 6LU7, 6M03, and 6Y84), SARS-CoV-2 Nsp15/NendoU (PDB: 6VWW, 6W01, and 6W02), SARS-CoV-2 rS (PDB: 6M0J, 6M17, 6VX1, and 6VW1), and SARS-CoV-2 RdRp (PDB: 6M71). The best docking scores are summarized in Table 3.\nThe main protease, SARS-CoV-2 Mpro, is a cysteine protease that is essential for processing the polyproteins that are translated from the coronavirus RNA [108]. The substrate binding site of the enzyme is a cleft flanked by Gln189, Met49, Pro168, Glu166 and His41; the active site is Cys145 and His41. The compound with the best normalized docking score to SARS-CoV-2 Mpro was the sesquiterpene hydrocarbon (E)-β-farnesene (DSnorm = −115.4 kJ/mol). Other essential oil components showing good docking scores with SARS-CoV-2 Mpro were (E,E)-α-farnesene (DSnorm = −115.0 kJ/mol), (E,E)-farnesol (DSnorm = −112.4 kJ/mol), and (E)-nerolidol (DSnorm = −110.7 kJ/mol). The sesquiterpene hydrocarbons (E,E)-α-farnesene and (E)-β-farnesene occupy the substrate binding site, flanked by Gln189, Arg188, Met165, His41, and Asp 187 (Figure 1). The lowest-energy docked poses of both (E,E)-farnesol and (E)-nerolidol showed hydrogen bonding of the alcohol moiety to Gln192 and Thr190 and, in the case of (E)-nerolidol, also with GLN189 and ARG188 (Figure 2).\nNon-structural protein 15 (Nsp15) of SARS-CoV-2 is an endoribonuclease that preferentially cleaves RNA at uridylate. Furthermore, it has been shown that SARS-CoV Nsp15/NendoU is required for successful viral infection [109]. The best docking ligands for SARS-CoV Nsp15/NendoU are (E,E)-α-farnesene (DSnorm = −107.5 kJ/mol), (E)-β-farnesene (DSnorm = −105.0 kJ/mol), (E,E)-farnesol (DSnorm = −104.6 kJ/mol), and (E)-nerolidol (DSnorm = −101.6 kJ/mol). All of these sesquiterpenoids preferentially docked into a binding site formed by amino acid residues Gln347, Ile328, Val276, Ser274, Thr275, Ser329, Asn74, Asn75, Glu327, and Lys71 (Figure 3). In addition to van der Waals interactions, (E,E)-farnesol showed hydrogen-bonding interactions with Ser329 and Glu327, while (E)-nerolidol hydrogen bonded with Asn75 and Lys71 (Figure 3). Unfortunately, the docking scores for these ligands as well as the scores of the other essential oil components with this protein are too low for it to be considered a viable target (see Table 3).\nADP ribose phosphatase (ADRP) serves to convert ADP-ribose 1″-monophosphate (Appr-1″-p) to ADP-ribose (Appr), which serves to regulate virus replication [110]. This enzyme may be dispensable in SARS-CoV-2, however [111]. Nevertheless, (E,E)-farnesol showed the most exothermic docking to SARS-CoV-2 ADRP with DSnorm = −121.4 kJ/mol. The binding site in SARS-CoV-2 ADRP is surrounded by Phe132, Asn40, Ile131, Ala38, and Ala39, with hydrogen-bonded interactions between the ligand alcohol and Asn40 (Figure 4). Additional essential oil components with good docking scores with SARS-CoV-2 ADRP include the sesquiterpene hydrocarbons (E)-β-farnesene (DSnorm = −116.3 kJ/mol), (E,E)-α-farnesene (DSnorm = −114.2 kJ/mol), β-sesquiphellandrene (DSnorm = −115.7 kJ/mol), and α-zingiberene (DSnorm = −115.4 kJ/mol); the diterpenoids phytol (DSnorm = −118.9 kJ/mol) and phytone (DSnorm = −116.9 kJ/mol); and the phenylpropanoid eugenyl acetate (DSnorm = −115.4 kJ/mol). Not surprisingly, β-sesquiphellandrene and α-zingiberene adopted the same docking orientation in the binding site of the enzyme (Figure 5A). Similarly, phytol and phytone occupy the same location in the binding site (Figure 5B).\nRNA-dependent RNA polymerase catalyzes RNA replication from an RNA template and is an essential enzyme in RNA viruses. Because these enzymes are crucial in viral replication, they are viable targets in antiviral chemotherapy [112]. Molecular docking of essential oil components with SARS-CoV-2 RdRp showed only weak docking with this enzyme target (Table 3). The ligand with the best docking score was (E,E)-farnesol, with DSnorm = −89.6 kJ/mol.\nThe SARS-CoV-2 spike protein serves to attach to angiotensin-converting enzyme 2 (ACE2) of the human cell to be invaded. The interface between SARS-CoV-2 rS and human ACE2 would be a promising target to prevent binding of SARS-CoV-2 rS to human ACE2 [113,114]. The best docking ligands with human ACE2, i.e., normalized docking scores \u003c -100 kJ/mol (α-bulnesene, eremanthin, (E,E)-α-farnesene, (E)-β-farnesene, (E,E)-farnesol, (E)-nerolidol, β-sesquiphellandrene, and (Z)-spiroether), all show docking preference to a cavity removed from the interaction interface between the SARS-CoV-2 spike protein and ACE2 (Figure 6). This cavity is a pocket surrounded by residues Pro565, Leu95, Val209, Asn210, Leu91, Lys94, Glu208, and Glu564. Because of the remote location of docking with ACE2, it is predicted that interaction of essential oil components with ACE2 will not prevent protein–protein interaction between the SARS-CoV-2 spike protein and human ACE2.\nOn the other hand, the lowest energy poses of essential oil components showing the strongest docking (\u003c−80 kJ/mol; (E)-cinnamyl acetate, eremanthin, (E,E)-α-farnesene, (E)-β-farnesene, (E,E)-farnesol, and geranyl formate) with the binding domain of the SARS-CoV-2 spike protein do lie at the interface between the SARS-CoV-2 spike protein and human ACE2 (Figure 6). This docking site is a hydrophobic pocket formed by Tyr505, Tyr495, Asn501, Arg403, Tyr453, and Gly502. Unfortunately, the docking energies at this site are too weak and are unlikely, therefore, to disrupt binding between SARS-CoV-2 rS and human ACE2.\nIn order to compare docking scores of the essential oil components with other proteins, docking was also carried out with six randomly selected non-virus proteins: Bovine odorant binding protein (BtOBP, PDB: 1GT3), cruzain (PDB: 1ME3), torpedo acetylcholinesterase (TcAChE, PDB: 6G1U), Bacillus anthracis nicotinate mononucleotide adenylytransferase (BaNadD, PDB: 3HFJ), Russell’s viper phospholipase A2 (DrPLA2, PDB: 1FV0), and Escherichia coli l-aspartate aminotransferase (EcAspTA, PDB: 2Q7W). Docking scores for these proteins are summarized in Table 4.\nThe docking results of the essential oil components with the six randomly selected proteins indicate the best docking ligands to SARS-CoV-2 targets (i.e., (E,E)-α-farnesene, (E)-β-farnesene, and (E,E)-farnesol) have better docking energies with other proteins. These three sesquiterpenes have docking energies of −129.8, −122.7, and −133.0 kJ/mol with TcAChE, respectively, and −131.8, −131.8, and −135.6 kJ/mol, respectively, with BaNadD. Indeed, most of the essential oil ligands have better docking properties with one or more of the random proteins compared to the SARS-CoV-2 proteins.\nBased on the docking energies of essential oil components with key protein targets of SARS-CoV-2, the individual essential oil components cannot be considered viable chemotherapeutic agents for interaction with the SARS-CoV-2 target proteins. However, essential oils are complex mixtures of compounds and several essential oil components may act synergistically to inhibit the virus. Astani and co-workers have shown, for example, that the antiviral activity (HSV-1) of Eucalyptus oil is much greater than the major component 1,8-cineole, and that tea tree oil has a greater antiviral activity than its components terpinen-4-ol, γ-terpinene, and α-terpinene [52].\nSynergistic effects have also been observed between essential oils and synthetic antiviral agents. Civitelli and co-workers observed an antiviral synergism between Mentha suaveolens essential oil and acyclovir on HSV-1 [64]. Likewise, Melissa officinalis essential oil potentiated the activity of oseltamivir against avian influenza virus H9N2 [115]. Furthermore, essential oils are lipophilic and therefore may also serve to disintegrate viral membranes [116].\nOutside of antiviral activity, there may be some relief of symptoms of COVID-19 provided by essential oils. For example, linalool [117,118], β-caryophyllene [119,120], and 1,8-cineole [121,122] have both anti-inflammatory and antinociceptive activity; menthol [123,124], camphor [125,126], and thymol [127] have antitussive activities.\n\n3. Materials and Methods\n\n3.1. Bibliographic Search Criteria\nThe bibliographic research was performed using the databases Google Scholar, Pubmed, Science Direct, Medline, and Scopus. The keywords applied were “antiviral activity” and “essential oils”, “antiviral activity” and “volatile compounds”, and “essential oils” and “respiratory diseases”.\n\n3.2. Ligand Selection\nThe major components (\u003e5%) of essential oils and pure essential oil components that have been screened against human pathogenic viruses were selected. In the case where enantiomers are known to be natural products, both structures were selected. A total of 171 essential oil components were used in the virtual screening.\n\n3.3. Molecular Docking\nEach ligand structure was prepared using Spartan ’18 v. 1.4.4 (Wavefunction, Inc., Irvine, CA, USA). The lowest-energy conformations of the ligands were determined and used as starting structures in the molecular docking. This is particularly important to include all potential conformations in medium-sized rings where interconversion between conformations may be hindered (e.g., bicyclogermacrene, costunolide, curdione, germacrene D, germacrone, and α-humulene). A total of six protein targets of SARS-CoV-2 from the Protein Data Bank (PDB), represented by a total of 17 structures, were used in the molecular docking, including SARS-CoV-2 main protease (PDB: 5R7Z, 5R80, 5R81, 5R82, 5R83, 5R84, 6LU7, 6M03, and 6Y84), SARS-CoV-2 endoribonuclease (PDB: 6VWW), SARS-CoV-2 ADP ribose phosphatase (PDB: 6W01 and 6W02), SARS-CoV-2 RNA-dependent RNA polymerase (PDB: 6M71), SARS-CoV-2 spike protein binding domain (PDB: 6M0J, 6VX1, 6VW1, and 6M17), and the human angiotensin-converting enzyme (PDB: 6M0J, 6VX1, 6VW1, and 6M17). Molecular docking was carried out using Molegro Virtual Docker v. 6.0.1 (Aarhus, Denmark) as previously reported [128,129]. Briefly, a 15-Å radius sphere centered on the binding sites of each protein structure in order to permit each ligand to search. In the case of the spike protein and human ACE2, the docking sphere was located at the interface between the spike protein and ACE2. In one case, ACE2 was removed and docking was carried out with the spike protein, and in the other case, the spike protein was removed and docking was carried out with ACE2. Standard protonation states of each protein, based on neutral pH, were used, and charges were assigned based on standard templates as part of the Molegro Virtual Docker program. Each protein was used as a rigid model without protein relaxation. Flexible-ligand models were used in the docking optimizations. Different orientations of the ligands were searched and ranked based on their “rerank” energy scores. A minimum of 100 runs for each ligand was carried out. In analyzing the docking scores, we accounted for the recognized bias due to molecular weight [130,131,132] using the scheme: DSnorm = 7.2 × Edock/MW⅓, where DSnorm is the normalized docking score, Edock is the MolDock re-rank score, MW is the molecular weight, and 7.2 is a scaling constant to ensure the average DSnorm values are comparable to those of Edock [128]. The best docking results are summarized in Table 1.\n\n4. Conclusions\nA molecular docking analysis was carried out using 171 essential oil components with the SARS-CoV-2 main protease (SARS-CoV-2 Mpro), SARS-CoV-2 endoribonucleoase (SARS-CoV-2 Nsp15/NendoU), SARS-CoV-2 ADP-ribose-1″-phosphatase (SARS-CoV-2 ADRP), SARS-CoV-2 RNA-dependent RNA polymerase (SARS-CoV-2 RdRp), the binding domain of the SARS-CoV-2 spike protein (SARS-CoV-2 rS), and human angiotensin-converting enzyme (hACE2). The best docking ligands for the SARS-CoV target proteins were (E,E)-α-farnesene, (E)-β-farnesene, and (E,E)-farnesol. The docking energies were relatively weak, however, and are unlikely to interact with the virus targets. However, essential oil components may act synergistically, essential oils may potentiate other antiviral agents, or they may provide some relief of COVID-19 symptoms.\n\nAcknowledgments\nW.N.S. participated in this work as part of the activities of the Aromatic Plant Research Center 237 (APRC, https://aromaticplant.org/).\n\nAuthor Contributions\nConceptualization, J.K.R.d.S., K.G.B., and W.N.S.; methodology, J.K.R.d.S., K.G.B., and W.N.S.; formal analysis, W.N.S.; investigation, J.K.R.d.S., P.L.B.F., K.G.B., and W.N.S.; data curation, W.N.S.; writing—original draft preparation, J.K.R.d.S. and W.N.S.; writing—review and editing, J.K.R.d.S., P.L.B.F., K.G.B., and W.N.S.; project administration, W.N.S.; All authors have read and agreed to the published version of the manuscript.\n\nFunding\nThis research received no external funding.\n\nConflicts of Interest\nThe authors declare no conflict of interest. Abbreviations\nAdeno Adenovirus\nAIV Avian influenza virus\nBaNadD Bacillus anthracis nicotinate mononucleotide adenylytransferase\nBtOBP Bovine odorant binding protein\nCOVID-19 Coronavirus disease 2019\nCox B1 Coxsackie B1 virus\nDENV-1 Dengue virus serotype 1\nDENV-2 Dengue virus serotype 2\nDENV-3 Dengue virus serotype 3\nDENV-4 Dengue virus serotype 4\nDrPLA2 Russell’s viper phospholipase A2\nDSnorm Normalized docking score\nEcAspTA Esherichia coli L-aspartate aminotransferase\nECHO 9 Echovirus 9\nhACE2 Human angiotensin-converting enzyme\nHeLa Human cervical tumor cells\nHEp-2 Human epithelial type 2 cells\nHRSV Human respiratory syncytial virus\nHSV-1 Herpes simplex virus 1\nHSV-2 Herpes simplex virus 2\nIC50 Median inhibitory concentration\nJUNV Junin virus\nMDCK Madin-Darby canine kidney cells\nMTT 3-(4,5-dimethylthiazol-2-yl)-2,5-diphenyltetrazolium bromide\nPCR Polymerase chain reaction\nPDB Protein data bank\nPolio 1 Poliomyelitis virus 1\nRC-37 African green monkey kidney cells\nSARS-CoV-2 2019 severe acute respiratory syndrome coronavirus 2\nTcAChE Torpedo acetylcholinesterase\nVero African green monkey kidney cells\nYFV Yellow fever virus\n\nFigure 1 Lowest-energy docked poses of (E)-β-farnesene and (E,E)-α-farnesene with the SARS-CoV-2 main protease (PDB: 6LU7). (A) Ribbon structure of the enzyme and (E)-β-farnesene. (B) Solid structure of the enzyme showing (E)-β-farnesene in the binding cleft. (C) Amino acid residues in proximity to the docked (E)-β-farnesene. (D) Lowest-energy docked pose of (E,E)-α-farnesene in the enzyme binding site.\nFigure 2 Lowest-energy docked poses of (E,E)-farnesol and (E)-nerolidol with the SARS-CoV-2 main protease (PDB: 6Y84). (A) Ribbon structure of the enzyme and (E,E)-farnesol (magenta) and (E)-nerolidol (orange). (B) Solid structure of the enzyme showing (E,E)-farnesol (magenta) and (E)-nerolidol (orange) in the binding cleft. (C) Important interactions of amino acid residues with (E,E)-farnesol. (D) Important interactions of amino acid residues with (E)-nerolidol. Hydrogen bonds are indicated with blue dashed lines.\nFigure 3 Lowest-energy docked poses of (E,E)-α-farnesene, (E)-β-farnesene, (E,E)-farnesol, and (E)-nerolidol with SARS-CoV-2 endoribonuclease (PDB: 6VWW). (A) Ribbon structure of the enzyme and (E,E)-α-farnesene (green), (E)-β-farnesene (aqua), (E,E)-farnesol (magenta), and (E)-nerolidol (orange). (B) Solid structure of the enzyme showing (E,E)-α-farnesene (green), (E)-β-farnesene (aqua), (E,E)-farnesol (magenta), and (E)-nerolidol (orange) in the binding cleft. (C) Lowest-energy docked pose of (E,E)-α-farnesene in the binding site. (D) Lowest-energy docked pose of (E)-β-farnesene in the binding site. (E) Lowest-energy docked pose of (E,E)-farnesol in the binding site. (F) Lowest-energy docked pose of (E)-nerolidol in the binding site. Hydrogen bonds are indicated with blue dashed lines.\nFigure 4 Lowest-energy docked pose of (E,E)-farnesol with SARS-CoV-2 ADP ribose phosphatase (PDB: 6W02). (A) Ribbon structure of the enzyme and the docked ligand. (B) Solid structure of the enzyme showing (E,E)-farnesol in the binding cleft. (C) Amino acid residues in proximity to the docked (E,E)-farnesol (hydrogen bonds are indicated with blue dashed lines).\nFigure 5 Lowest-energy docked poses of β-sesquiphellandrene, α-zingiberene, phytol, and phytone with SARS-CoV-2 ADP ribose phosphatase (PDB: 6W02). (A) Ribbon structure of the enzyme with β-sesquiphellandrene (brown) and α-zingiberene (yellow). (B) Ribbon structure of the enzyme with phytol (green) and phytone (red).\nFigure 6 Lowest-energy docked ligands with the binding domain of SARS-CoV-2 spike protein and human angiotensin-converting enzyme 2 (ACE2) (PDB: 6M17).\nTable 1 Essential oils showing antiviral activity.\nEssential Oil Major Components Assay IC50 (μg/mL) Reference\nAloysia gratissima (Gillies \u0026 Hook.) Tronc. caryophyllene oxide (15.8%), guaiol (17.4%) a, chrysanthenyl acetate (5.6%), and limonene oxide (5.3%) Plaque reduction assay (Vero cells), HSV-1 65.0 [37]\nAloysia triphylla Royle α-thujone (22.9%), cis−carveol (17.5%), carvone (13.2%), and limonene (12.7%) Plaque reduction assay (Vero cells), HSV-1 \u003e250 [38]\nArtemisia arborescens L. camphor (35.7%), β-thujone (24.0%), and chamazulene (7.7%) Plaque reduction assay (Vero cells), HSV-1 25% inhibition at 100 μg/mL [39]\nArtemisia arborescens L. Artemisia arborescens L. β-thujone (45.0%), camphor (6.8%), and chamazulene (22.7%) c Plaque reduction assay (Vero cells), HSV-1, HSV-2 2.4, 4.1 [40]\nArtemisia douglasiana Besser α-thujone (68.3%) and β-thujone (7.5%) Plaque reduction assay (Vero cells), HSV-1 83 [37]\nArtemisia kermanensis Podlech (syn. Seriphidium kermanense (Podlech) K. Bremer \u0026 Humphries α-thujone (13.8%), camphor (10.2%), and β-thujone (6.2%) Plaque reduction assay (Vero cells), HSV-1 40 [41]\nArtemisia mendozana DC. camphor (22.4%), artemiseole (11.7%), artemisia alcohol (10.8%), and borneol (7.2%) Plaque reduction assay, DENV−2, JUNV and HSV-1 129.3, 178.6, and 153.7 [38]\nArtemisia princeps Pamp. borneol (12.1%), α-thujone (8.7%), τ−cadinol, (6.7%), and 1,8-cineole (6.2%) Plaque reduction assay, murine norovirus−1 64% inhibition at 0.01% [42]\nPlaque reduction assay, feline calicivirus−F9 48% inhibition at 0.1%\nArtemisia vulgaris L. α-thujone (38.1%), β-thujone (10.6%), and 1,8-cineole (8.8%) Virus yield assay (Vero cells), yellow fever virus (YFV) 100 μg/mL (100% inhibition) [43]\nAyapana triplinervis (Vahl) R.M. King \u0026 H. Rob. thymohydroquinone dimethyl ether Plaque reduction assay (A549 cells), Zika virus 38.0 [44]\nBuddleja cordobensis Griseb. caryophyllene oxide (32.1%), β-caryophyllene (16.5%), and α-copaene (8.5%) Plaque reduction assay, DENV−2, JUNV and HSV-1 86.4, 39.0, and 54.1 [38]\nCedrus libani A. Rich. himachalol (22.5%), β-himachalene (21.9%), and α-himachalene (10.5%) Cytopathic effect (CPE) on Vero cells, HSV-1 440 [45]\nCinnamomum zeylanicum Blume (syn. Cinnamomum verum J. Presl) eugenol (75–85%), linalool (1.6−8.5%), (E)−cinnamaldehyde (0.6−1.5%), (E)−cinnamyl acetate (0.7–2.6%), β-caryophyllene (0.5–6.7%), eugenyl acetate (0.1–2.9%), and benzyl benzoate (0.1–8.3%) Influenza type A (H1N1) [46]\nCinnamomum zeylanicum Blume (syn. Cinnamomum verum J. Presl) (E)−cinnamaldehyde (63.9%), eugenol (7.0%), and (E)−cinnamyl acetate (5.1%) c Plaque reduction assay (HeLa cells), HSV-2 82 [47]\nCitrus × bergamia Risso \u0026 Poit. limonene (23–55%), linalool (2–37%), linalyl acetate (12–41%), β-pinene (up to 10%), and γ-terpinene (up to 10%) Influenza virus type A H1N1 100% inhibition at 0.3% [46]\nCitrus limonum Risso limonene (54.6%), γ-terpinene (19.1%), and β-pinene (14.5%) d Plaque reduction assay (Vero cells), HSV-1 2500 [48]\nCitrus reshni Hort ex Tan. (leaf EO) sabinene (40.5%), linalool (23.3%), and terpinen-4-ol (8.3%) Plaque reduction assay, influenza A virus H5N1 19.4% inhibition at 0.1 μL/mL [36]\nCitrus reshni Hort ex Tan. (unripe fruit peel EO) limonene (82.4%) and linalool (7.2%) Plaque reduction assay, influenza A virus H5N1 61.5% inhibition at 1.5 μL/mL [36]\nCitrus reshni Hort ex Tan. (ripe fruit peel EO) limonene (91.6%) Plaque reduction assay, influenza A virus H5N1 50% inhibition at 1.5 μL/mL [36]\nCupressus sempervirens L. α-pinene (51.9%) and δ-3-carene (24.9%) c Plaque reduction assay (Vero cells), HSV-1 6600 [48]\nCymbopogon citratus (DC.) Stapf geranial (40.2%), neral (30.6%), and geraniol (6.7%) c Plaque reduction assay (Vero cells), HSV-1 91 [48]\nCymbopogon flexuosus (Nees) Will. Watson geranial (48–54%) and neral (29–33%) Influenza virus type A (H1N1) [46]\nCynanchum stauntonii (Decne.) Schltr. ex H. Lév. (2E,4E)-decadienal (23.0%), γ-nonalactone (4.2%), 5-pentyl-2(3H)−furanone (3.8%), and 3-isopropyl-1-pentanol (3.5%) Influenza type A (H1N1) 64 [46]\nDysphania ambrosioides (L.) Mosyakin \u0026 Clemants cis-ascaridole (60.7%) and m-cymene (22.2%) Plaque reduction assay, Coxsackie virus B4 21.75 [49]\nEucalyptus astringens (Maiden) Maiden 1,8-cineole (42.0%), α-pinene (22.0%), and trans−pinocarveol (7.0%) Vero cells, Coxsakie virus B3 13.0 [50]\nEucalyptus bicostata Maiden, Blakely \u0026 Simmonds 1,8-cineole (68.0%), globulol (5.4%), and trans−pinocarveol (4.6%) Vero cells, Coxsakie virus B3 13.6 [50]\nEucalyptus caesia Benth. 1,8-cineole (40.2%), p-cymene (14.1%), γ-terpinene (12.4%), α-pinene (7.7%), and terpinen-4-ol (5.6%) Plaque reduction assay (Vero cells), HSV-1 70 [41]\nEucalyptus camaldulensis Dehnh. α-terpinene (26.3%), α-terpineol (9.1%), and camphene (8.5%) e Plaque reduction assay, Rotavirus Wa strain 50% inhibition at 10% EO concentration [51]\nEucalyptus camaldulensis Dehnh. α-terpinene (26.3%), α-terpineol (9.1%), and camphene (8.5%) e Plaque reduction assay, Coxsackie virus B4 53.3% at 10% EO concentration [51]\nEucalyptus camaldulensis Dehnh. α-terpinene (26.3%), α-terpineol (9.1%), and camphene (8.5%) e Plaque reduction assay, HSV-1 90% at 10% EO concentration [51]\nEucalyptus camaldulensis Dehnh. α-terpinene (26.3%), α-terpineol (9.1%), and camphene (8.5%) e Plaque reduction assay, adenovirus type 7 0% at 10% EO concentration [51]\nEucalyptus cinereal F. Muell. ex Benth. 1,8-cineole (70.4%), α-pinene (4.5%), and limonene (3.7%) Vero cells, Coxsakie virus B3 13.0 [50]\nEucalyptus globulus Labill. 1,8-cineole (63.8%) and α-pinene (14.0%) f Plaque reduction assay (Vero cells), HSV-1 1700 [48]\nEucalyptus globulus Labill. 1,8-cineole (63.8%) and α-pinene (14.0%) f Plaque reduction assay (RC-37 cells), HSV-1 55.0 [52]\nEucalyptus lehmannii (Schauer) Benth. 1,8-cineole (59.6%), α-pinene (17.6%), and α-terpineol (8.7%) Vero cells, Coxsakie virus B3 11.5 [50]\nEucalyptus leucoxylon F. Muell. 1,8-cineole (59.2%), α-pinene (7.8%), and α-terpineol (4.3%) Vero cells, Coxsakie virus B3 8.1 [50]\nEucalyptus maidenii F. Muell. 1,8-cineole (57.8%), p-cymene (7.4%), and α-pinene (7.3%) Vero cells, Coxsakie virus B3 14.5 [50]\nEucalyptus odorata Behr cryptone (20.9%), p-cymene (16.7%), phellandral (6.6%), and cuminal (6.6%) Vero cells, Coxsakie virus B3 19.2 [50]\nEucalyptus sideroxylon A. Cunn. ex Woolls 1,8-cineole (69.2%), α-pinene (6.9%), and α-terpineol (5.4%) Vero cells, Coxsakie virus B3 12.3 [50]\nEupatorium patens D. Don ex Hook. \u0026 Arn. germacrene D (36.2%), β-caryophyllene (14.1%), and bicyclogermacrene (7.0%) Plaque reduction assay (Vero cells), HSV-1 125 [37]\nFortunella margarita (Lour.) Swingle (leaf EO) α-terpineol (55.5%), carvone (5.7%), carveol (5.5%), γ-muurolene (5.5%), and citronellal (5.0%) MTT assay, reasserted avian influenza A virus, H5N1 6.77 [53]\nFortunella margarita (Lour.) Swingle (fruit EO) β-eudesmol (28.3%), α-muurolene (10.3%), β-gurjunene (10.0%), γ-eudesmol (8.4%), and γ-muurolene (6.6%) MTT assay, reasserted avian influenza A virus, H5N1 38.89 [53]\nGaillardia megapotamica (Spreng.) Baker β-pinene (24.2%), (Z)-β-ocimene (16.5%), α-pinene (7.7%), limonene (7.5%), and β-caryophyllene (6.7%) Plaque reduction assay, DENV−2, JUNV and HSV-1 140.6, 49.8, and 99.1 [38]\nHeterothalamus alienus (Spreng.) Kuntze β-pinene (35.5%), spathulenol (10.7%), and germacrene D (6.8%) Plaque reduction assay DENV−2, JUNV and HSV-1 122.3, 44.2 and 148.4 [38]\nHeterotheca latifolia Buckley borneol (40.0%), camphor (24.3%), and limonene (5.1%) Plaque reduction assay (Vero cells), HSV-1 \u003e150 [37]\nHouttuynia cordata Thunb. decanal (3.4−8.9%), decanol (up to 7.0%), 2−undecanone (23.0−36.1%), decanoic acid (1.4−6.3%), dodecanal (up to 7.3%), and 2−tridecanone (2.6−5.6%) Influenza type A (H1N1) 48 [54]\nHyptis mutabilis (Rich.) Briq. fenchone (17.1%), 1,8-cineole (12.6%), β-caryophyllene (10.9%), bicyclogermacrene (8.7%), and germacrene D (6.2%) Plaque reduction assay (Vero cells), HSV-2 (Human Herpesvirus type 1) 79.01 [55]\nHyptis mutabilis (Rich.) Briq. germacrene D (15.1%), β-caryophyllene (13.3%), curzerene (13.3%), and bicyclogermacrene (13.2%) Plaque reduction assay (Vero cells) \u003e150 [37]\nHyssopus officinalis L. cis−pinocamphone (40.1%), trans−pinocamphone (13.3%), β-pinene (10.7%), and β-phellandrene (5.3%) c Plaque reduction assay (RC-37 cells), HSV-1 1 [56]\nHyssopus officinalis L. cis−pinocamphone (40.1%), trans−pinocamphone (13.3%), β-pinene (10.7%), and β-phellandrene (5.3%) c Plaque reduction assay (RC-37 cells), HSV-2 6 [57]\nIllicium verum Hook. f. (E)−anethole (90.5%) c Plaque reduction assay (RC-37 cells), HSV-1 40 [58]\nIllicium verum Hook. f. (E)−anethole (90.5%) c Plaque reduction assay (RC-37 cells), HSV-1 1 [59]\nIllicium verum Hook. f. (E)−anethole (90.5%) c Plaque reduction assay (RC-37 cells), HSV-2 30 [57]\nJungia polita Griseb. caryophyllene oxide (9.2%) and β-caryophyllene (8.1%) Plaque reduction assay DENV−2, JUNV and HSV-1 39.8, 134.2 and 136.4 [38]\nJuniperus communis L. α-pinene (46.7%), myrcene (15.0%), sabinene (13.2%), and limonene (7.0%) c Plaque reduction assay (Vero cells), HSV-1 \u003e10000 [48]\nLavandula angustifolia Mill. linalyl acetate (37.0−43.6%), linalool (19.7−39.1%), geraniol (up to 9.3%), β-caryophyllene (up to 5.1%), terpinene−4−ol (up to 14.9%), lavandulol (up to 1.5%), lavandulyl acetate (up to 5.5%), 1,8-cineole (up to 4.1%), and borneol (up to 6.4%) 85% in vitro inhibition of influenza type A (H1N1) [46]\nLavandula latifolia Medik. linalool (31.9%), 1,8-cineole (18.8%), and borneol (10.1%) g Plaque reduction assay (Vero cells), HSV-1 2200 [48]\nLepechinia salviifolia (Kunth) Epling camphor (10.3%), limonene (9.7%), p−mentha−1(7),8−diene (7.4%), α-pinene (6.9%), and γ-terpinene (6.7%) Plaque reduction assay (Vero cells), HSV-1, HSV-2 68.8, 81.9 [55]\nLepechinia vulcanicola J.R.I. Wood limonene (18.9%), germacrene D (10.4%), 1−octen−3−ol (8.8%), β-caryophyllene (8.7%), and α-pinene (8.2%) Plaque reduction assay (Vero cells), HSV-1, HSV-2 112, 68.9 [55]\nLeptospermum scoparium J.R. Forst. \u0026 G. Forst. calamene (16.0%), leptospermone (14.5%), δ−cadinene (6.1%), flavesone (4.5%), viridiflorene (4.4%), and isoleptospermone (3.9%) Plaque reduction assay (RC-37 cells), HSV-1, HSV-2 0.96, 0.58 [60]\nLippia alba (Mill.) N.E. Br. ex Britton \u0026 P. Wilson carvone (51.0%), Limonene (33%), and bicyclosesquiphellandrene (7.0%) Virus yield assay (Vero cells), yellow fever virus (YFV) 100 μg/mL (100% inhibition) [43]\nLippia alba (Mill.) N.E. Br. ex Britton \u0026 P. Wilson carvone (39.7%), limonene (30.6%), and bicyclosesquiphellandrene (8.9%) Plaque reduction assay (Vero cells), DENV−1, DENV−2, DENV−3, DENV−4, YFV 17 DD 10.1, 0.4, 32.6, 21.1, 4.9 [61]\nLippia alba (Mill.) N.E. Br. ex Britton \u0026 P. Wilson carvone (39.7%), limonene (30.6%), and bicyclosesquiphellandrene (8.9%) Plaque reduction assay (Vero cells), Yellow fever (YFV) 4.3 [62]\nLippia citriodora Kunth (syn. Aloysia citriodora Palau) geranial (18.9%), neral (15.6%), limonene (10.7%), and 1,8-cineole (5.0) Plaque reduction assay (Vero cells), DENV−1, DENV−2, DENV−3, DENV−4, YFV 17 DD 1.9, 2.9, 2.6, 33.7, 5.7 [61]\nLippia citriodora Kunth (syn. Aloysia citriodora Palau) geranial (18.9%), neral (15.6%), limonene (10.7%), and 1,8-cineole (5.0) Plaque reduction assay (Vero cells), Yellow fever (YFV) 19.4 [62]\nLippia graveolens Kunth carvacrol (56.8%), o−cymene (32.1%), and γ-terpinene (3.7%) h MTT assay (Mardin−Darby bovine kidney cells), HSV-1, ACVR−HSV-1 (acyclovir−resistant HSV-1), HRSV (human respiratory syncytial virus) 99.6, 55.9, 68.0 [63]\nLippia junelliana (Moldenke) Tronc. piperitenone oxide (= rotundifolone) (36.5%), limonene (23.1%), camphor (7.9%), and spathulenol (6.5%) Plaque reduction assay (Vero cells), HSV-1 \u003e150 [37]\nLippia origanoides carvacrol (44.0%), thymol (15.0%), and γ-terpinene (10.0%) Virus yield assay (Vero cells), yellow fever virus (YFV) 11.1 μg/mL (100% inhibition) [43]\nLippia turbinata Griseb. limonene (60.6%), piperitenone oxide (17.4%), and β-caryophyllene (6.4%) Plaque reduction assay (Vero cells), HSV-1 \u003e 150 [37]\nMatricaria recutita L. α-bisabolol oxide A (13.4–55.9%), α-bisabolol oxide B (8.4–25.1%), bisabolone oxide A (2.9–11.4%), cis−bicycloether (= (Z)−spiroether) (3.6–17.7%), and (E)-β-farnesene (1.9–10.4%) i Plaque reduction assay (RC-37 cells), HSV-1 0.3 [58]\nMatricaria recutita L. α-bisabolol oxide A (13.4–55.9%), α-bisabolol oxide B (8.4–25.1%), bisabolone oxide A (2.9−11.4%), cis−bicycloether (= (Z)−spiroether) (3.6–17.7%), and (E)-β-farnesene (1.9–10.4%) i Plaque reduction assay (RC-37 cells), HSV-2 1.5 [57]\nMelaleuca alternifolia Cheel terpinen-4-ol (36.71%), γ-terpinene (22.20%), and α-terpinene (10.10%) Plaque reduction assay, influenza A⁄PR ⁄ 8 virus subtype H1N1 60 [31]\nMelaleuca alternifolia Cheel terpinen-4-ol (30–48%), γ-terpinene (10–28%), α-terpinene (5–13%), 1,8-cineole (up to 15%), terpinolene (1.5−5%), p-cymene (0.5–12%), α-pinene (1–6%), and α-terpineol (1.5–8%) 100% inhibition of influenza type A (H1N1) virus at 0.01%; type A (H11N9) virus to tea tree oil vapor caused 100% inhibition [46]\nMelaleuca alternifolia Cheel terpinen-4-ol (47.5%), γ-terpinene (20.2%), and α-terpinene (8.6%) c Plaque reduction assay (Vero cells), HSV-1 2700 [48]\nMelaleuca alternifolia Cheel terpinen-4-ol (47.5%), γ-terpinene (20.2%), and α-terpinene (8.6%) c Plaque reduction assay (Vero cells), HSV-1 13.2 [64]\nMelaleuca alternifolia Cheel terpinen-4-ol (47.5%), γ-terpinene (20.2%), and α-terpinene (8.6%) c Plaque reduction assay (RC-37 cells), HSV-1 2 [52]\nMelaleuca alternifolia Cheel terpinen-4-ol (47.5%), γ-terpinene (20.2%), and α-terpinene (8.6%) c Plaque reduction assay (HeLa cells), HSV-2 2700 [47]\nMelaleuca alternifolia Cheel terpinen-4-ol (47.5%), γ-terpinene (20.2%), and α-terpinene (8.6%) c Plaque reduction assay (Vero cells), HSV-1 significant plaque reduction at 10 and 5% v/v [65]\nMelaleuca armillaris (Sol. ex Gaertn.) Sm. 1,8-cineole (33.9%), terpinen-4-ol (18.8%), and γ-terpinene (10.4%) Plaque reduction assay (Vero cells), HSV-1 99% plaque reduction (concentration not given) [66]\nMelaleuca ericifolia Sm. methyl eugenol (96.84%) Plaque reduction assay (Vero cells), HSV-1 91.5% plaque reduction (concentration not given) [66]\nMelaleuca leucadendra (L.) L. 1,8-cineole (64.3%), α-terpineol (11.0%), and valencene (3.91%) Plaque reduction assay (Vero cells), HSV-1 92% plaque reduction (concentration not given) [66]\nMelissa officinalis L. neral (17−32%), geranial (23–43%), linalool (up to 9.0%), citronellal (0.7–20.3%), geraniol (up to 23.2%), β-caryophyllene (up to 11.3%), and caryophyllene oxide (0.4−31.7%) influenza A virus (H9N2) Significant reduction at 5 μg/mL [46]\nMelissa officinalis L. β-cubebene (15.4%), β-caryophyllene (14.2%), α-cadinol (7.2%), geranial (6.6%), and neral (5.8%) Plaque reduction assay (HEp−2 cells), HSV-2 21 [67]\nMelissa officinalis L. geranial (20.1%), β-caryophyllene (17.3%), and neral (13.6%) Plaque reduction assay (RC-37 cells), HSV-1, HSV-2 4, 0.8 [68]\nMentha × piperita L. menthol (42.8%), menthone (14.6%), and isomenthone (5.9%) Plaque reduction assay (RC-37 cells), HSV-1, HSV-2 20, 8 [69]\nMentha × piperita L. menthol (43.8%), menthone (19.7%), menthyl acetate (6.5%), and 1,8-cineole (5.0%) c Plaque reduction assay (Vero cells), HSV-1 2200 [48]\nMentha suaveolens Ehrh. limonene (7.4%), isopulegol (12.0%), and piperitenone oxide (41.8%) Plaque reduction assay, cytopathogenic murine norovirus 0.87 [70]\nMentha suaveolens Ehrh. piperitenone oxide (86.9%) Plaque reduction assay (Vero cells), HSV-1 5.1 [64]\nMinthostachys mollis Griseb. cis−piperitone epoxide (29.9%), piperitenone oxide (25.6%), menthone (7.4%), germacrene D (5.8%), and pulegone (5.5%) Plaque reduction assay (Vero cells), HSV-1, HSV-2 70.7, 68.0 [55]\nOcimum basilicum var. album (L.) Benth. linalool (53.8%) and eugenol (12.6%) j Plaque reduction assay (Vero cells), HSV-1 \u003e10000 [48]\nOcimum campechianum Mill. methyl eugenol (53.9%), β-caryophyllene (13.0%), α-bulnesene (5.4%), germacrene D (3.4%), and α-humulene (3.3%) Plaque reduction assay (Vero cells), HSV-2 74.33 [55]\nOriganum elongatum Emb. (leaf EO) p-cymene (16.2%), γ-terpinene (13.5%), thymol (14.2%), and carvacrol (19.2%) Plaque reduction assay, cytopathogenic murine norovirus 0.37 [70]\nOriganum elongatum Emb. (inflorescence EO) p-cymene (16.1%), γ-terpinene (7.3%), and carvacrol (40.1%), Plaque reduction assay, cytopathogenic murine norovirus 0.75 [70]\nOriganum majorana L. terpinen-4-ol (28.9%), γ-terpinene (14.9%), trans−sabinene hydrate (9.5%), α-terpinene (8.7%), and sabinene (7.2%) c Plaque reduction assay (Vero cells), HSV-1 2800 [48]\nOriganum majorana L. terpinen-4-ol (28.9%), γ-terpinene (14.9%), trans−sabinene hydrate (9.5%), α-terpinene (8.7%), and sabinene (7.2%) c Plaque reduction assay (HeLa cells), HSV-2 520 [47]\nOriganum vulgare L. trans−sabinene hydrate (21.0%), thymol (11.0%), and carvacrol methyl ether (11.0%) Virus yield assay (Vero cells), yellow fever virus (YFV) 100 μg/mL (100% inhibition) [43]\nOsmunda regalis L. hexahydrofarnesyl acetone ( = phytone) (11.8%), 2,4−di−t−butylphenol (6.8%), phytol (6.5%), hexadecene (4.1%), and octadecene (4.4%) Plaque reduction assay, Coxsackie virus B4 type 2 2.24 [71]\nPectis odorata Griseb. limonene (50.2%), neral (27.2%), and geranial (23.6%) Plaque reduction assay DENV−2, JUNV and HSV-1 39.6, 36.6, and 71.5 [38]\nPelargonium graveolens L’Hér. ex Aiton citronellol (21.9–37.5%), citronellyl formate (9.8–20.6%), geraniol (6.0–16.5%), geranyl formate (1.5–6.5%), menthone (up to 13%), isomenthone (up to 9.9%), and linalool (0.8−14.9%) influenza type A (H1N1) 95% inhibition at 0.3% [46]\nPinus mugo Turra δ-3-carene (23.9%), α-pinene (17.9%), β-pinene (7.8%), and β-phellandrene (7.2%) k Plaque reduction assay (RC-37 cells), HSV-1 7 [58]\nRavensara aromatica Sonn. (syn. Cryptocarya agathophylla van der Werff) 1,8-cineole (52.6%), α-terpineol (12.4%), and sabinene (11.0%) l Plaque reduction assay (Vero cells), HSV-1 2800 [48]\nRosmarinus officinalis L. α-pinene (23.9%), verbenone (15.4%), camphor (11.0%), camphene (8.7%), p-cymene (7.5%), and 3−octanone (5.6%) Plaque reduction assay (Vero cells), HSV-1 60 [41]\nRosmarinus officinalis L. 1,8-cineole (45.9%), α-pinene (12.0%), camphor (10.9%), and β-pinene (6.3%) b Plaque reduction assay (Vero cells), HSV-1 2700 [48]\nSalvia fruticosa Mill. 1,8-cineole (47.5%), camphor (9.0%), β-thujone (7.6%), and α-thujone (4.3%) Plaque reduction assay (Vero cells), HSV-1 and HSV-2 1300 [72]\nSantalum album L. (Z)−α-santalol (45.2%), (Z)-β-santalol (25.4%), and (Z)−trans−α-bergamotol (7.8%) c Plaque reduction assay (Vero cells), HSV-1, HSV-2 22.7, 45.3 [73]\nSantalum album L. (Z)−α-santalol (45.2%), (Z)-β-santalol (25.4%), and (Z)−trans−α-bergamotol (7.8%) c Plaque reduction assay (RC-37 cells), HSV-1 2 [56]\nSantalum album L. (Z)−α-santalol (45.2%), (Z)-β-santalol (25.4%), and (Z)−trans−α-bergamotol (7.8%) c Plaque reduction assay (RC-37 cells), HSV-2 5 [57]\nSantolina insularis (Gennari ex Fiori) Arrigoni artemisia ketone (21.2%), allo−aromadendrene (12.7%), 1,8-cineole (9.0%), and camphene (8.5%) m Plaque reduction assay (Vero cells), HSV-1 and HSV-2 0.88, 0.7 [74]\nSatureja hortensis L. carvacrol (32.4%), γ-terpinene (32.0%), thymol (10.0%), and p-cymene (6.6%) Plaque reduction assay (Vero cells), HSV-1 80 [41]\nTessaria absinthioides (Hook. \u0026 Arn.) DC. caryophyllene oxide (12.2%), (E)-β-damascenone, γ-eudesmol (8.5%), α-gurjunene (5.8%), and terpinen-4-ol (5.4%) Plaque reduction assay (Vero cells), HSV-1 105 [37]\nThymus capitatus (L.) Hoffmanns. \u0026 Link (unripe fruit EO) carvacrol (68.6%), p-cymene (4.8%), γ-terpinene (3.0%), and β-caryophyllene (2.9%) Plaque reduction assay, cytopathogenic murine norovirus 0.49 [70]\nThymus capitatus (L.) Hoffmanns. \u0026 Link (ripe fruit EO) carvacrol (58.8%), p-cymene (5.6%), γ-terpinene (2.8%), and β-caryophyllene (2.6%) Plaque reduction assay, cytopathogenic murine norovirus 0.50 [70]\nThymus vulgaris L. thymol (31–50%), p-cymene (0.1–26.6%), and γ-terpinene (up to 22.8%) 100% inhibition of type A (H1N1) virus at 0.3% concentration [46]\nThymus vulgaris L. thymol (43.9%), carvacrol (14.4%), p-cymene (10.5%), β-caryophyllene (7.0%), and γ-terpinene (5.1%) c Plaque reduction assay (RC-37 cells), HSV-1 10 [56]\nThymus vulgaris L. thymol (43.9%), carvacrol (14.4%), p-cymene (10.5%), β-caryophyllene (7.0%), and γ-terpinene (5.1%) c Plaque reduction assay (RC-37 cells), HSV-1 11 [52]\nThymus vulgaris L. thymol (43.9%), carvacrol (14.4%), p-cymene (10.5%), β-caryophyllene (7.0%), and γ-terpinene (5.1%) c Plaque reduction assay (RC-37 cells), HSV-2 7 [57]\nThymus willdenowii Boiss. 1,8-cineole (34.62%), camphor (18.55%), α-pinene (9.46%), and camphene (5.38%) Plaque reduction assay, Coxsackie virus Inactive [75]\nTrachyspermum ammi (L.) Sprague thymol (35–60%), α-pinene, p-cymene, and limonene Plaque reduction assay, Japanese encephalitis virus 80% reduction at 500 μg/mL [76]\nZataria multiflora Boiss. thymol (47.3%), carvacrol (21.9%), p-cymene (8.6%), γ-terpinene (4.2%), and β-caryophyllene (3.0%) Real time PCR (H9N2 subtype of AIV) Reduced viral replication in trachea of broiler chickens [77]\nZataria multiflora Boiss. thymol (33.1%), carvacrol (25.9%), and p-cymene (11.3%) Plaque reduction assay (Vero cells), HSV-1 30 [41]\nZingiber officinale Roscoe α-zingiberene (32.1%), ar−curcumene (15.2%), β-sesquiphellandrene (10.9%), α-farnesene (7.2%), and α-phellandrene (4.4%) Plaque reduction assay, Caprine alphaherpesvirus type I not determined [78]\nZingiber officinale Roscoe α-zingiberene (26.4%), camphene (12.6%), β-sesquiphellandrene (9.2%), ar−curcumene (6.5%), β-phellandrene (6.2%), and β-bisabolene (5.1%) c Plaque reduction assay (RC-37 cells), HSV-1 2 [56]\nZingiber officinale Roscoe α-zingiberene (26.4%), camphene (12.6%), β-sesquiphellandrene (9.2%), ar−curcumene (6.5%), β-phellandrene (6.2%), and β-bisabolene (5.1%) c Plaque reduction assay (RC-37 cells), HSV-2 1 [57]\na Reported as cadinol, but see [79,80]. b Essential oil composition not reported; essential oil composition obtained from [81]. c Essential oil composition not reported; essential oil composition of commercial (dōTERRA International, Pleasant Grove, Utah, USA). d Essential oil composition not reported; essential oil composition obtained from [82]. e Essential oil composition not reported; essential oil composition obtained from [83]. f Essential oil composition not reported; essential oil composition obtained from [84]. g Essential oil composition not reported; essential oil composition obtained from [85]. h Essential oil composition not reported; essential oil composition obtained from [86]. i Essential oil composition not reported; essential oil composition obtained from [87]. j Essential oil composition not reported; essential oil composition obtained from [88]. k Essential oil composition not reported; essential oil composition obtained from [89]. l Essential oil composition not reported; essential oil composition obtained from [90]. m Essential oil composition not reported; essential oil composition obtained from [91].\nTable 2 Antiviral activities of essential oil components.\nEssential Oil Component Assay IC50 (μg/mL) Reference\n(E)−Anethole Plaque reduction assay (RC-37 cells), HSV-1 20 [59]\nCamphor Plaque reduction assay (Vero cells), HSV-1 2600 [72]\nCarvacrol MTT assay (Mardin−Darby bovine kidney (MDBK) cells, HSV-1 48.6 [63]\nβ-Caryophyllene Plaque reduction assay (RC-37 cells), HSV-1 0.25 [59]\nCaryophyllene oxide Plaque reduction assay (RC-37 cells), HSV-1 0.7 [59]\n1,8-Cineole Plaque reduction assay (Vero cells), HSV-1 1800 [72]\n1,8-Cineole Plaque reduction assay (RC-37 cells), HSV-1 1200 [52]\n(E)-Cinnamaldehyde Influenza type A (H1N1) virus 70% at a concentration of 0.53% after 3 h [95]\n(E)-Cinnamaldehyde H1N1 in-vivo by inhalation in a mouse model 89% inhibition [95]\nCitral (Geranial + Neral) Yellow fever (YFV), Vero cells 17.6 [62]\nCitral (Geranial + Neral) Plaque reduction assay (RC-37 cells), HSV-1 3.50 [52]\np-Cymene Influenza, HSV-1, HSV-2, ECHO 9, Cox B1, Polio 1, Adeno 6 \u003e500 [31]\np-Cymene Plaque reduction assay (RC-37 cells), HSV-1 16 [52]\np-Cymene Influenza type A (H1N1) virus Inactive [25]\nDodecanal Influenza type A (H1N1) virus 51 [54]\nβ-Eudesmol Plaque reduction assay (Vero cells), HSV-1 6 [59]\nEugenol Plaque reduction assay (RC-37 cells), HSV-1 35 [59]\nEugenol Plaque reduction assay (RC-37 cells), HSV-1 25.6 [96]\nFarnesol Plaque reduction assay (RC-37 cells), HSV-1 3.5 [59]\nGermacrone Influenza type A (H1N1) virus 1.22–1.55 [97]\nGermacrone Influenza type A (H3N2) virus 0.34 [97]\nGermacrone Influenza type B virus 1.38 [97]\nIsoborneol Plaque reduction assay (Vero cells), HSV-1 \u003c1000 [98]\nNerolidol (natural) Plaque reduction assay (RC-37 cells), HSV-1 4.2 [99]\nNerolidol (synthetic) Plaque reduction assay (RC-37 cells), HSV-1 1.5 [99]\nOctanal Influenza type A (H1N1) virus 15 [54]\nPatchouli alcohol Influenza type A (H1N1) 89% inhibition at 10 μg/mL [100]\nPatchouli alcohol Influenza type A (H2N2) 0.89 [101]\nPatchouli alcohol Influenza type A (H2N2), in-vivo test using a mouse model 70% survival rate at a dose of 5 mg/(kg day) [101]\nα-Pinene Plaque reduction assay (RC-37 cells), HSV-1 4.5 [52]\nPiperitenone oxide Plaque reduction assay (Vero cells) 1.4 [64]\nα-Terpinene Influenza type A (H1N1) virus Inactive [25]\nα-Terpinene Influenza, HSV-1, HSV-2, ECHO 9, Cox B1, Polio 1, Adeno 4 \u003e12 [31]\nα-Terpinene Plaque reduction assay (RC-37 cells), HSV-1 8.5 [52]\nγ-Terpinene Plaque reduction assay (RC-37 cells), HSV-1 7 [52]\nγ-Terpinene Influenza, HSV-1, HSV-2, ECHO 9, Cox B1, Polio 1, Adeno 5 \u003e120 [31]\nγ-Terpinene influenza type A (H1N1) virus inactive [25]\nTerpinen-4-ol Influenza, HSV-1, HSV-2, ECHO 9, Cox B1, Polio 1, Adeno 2 25 (influenza)\u003e50 (others) [31]\nTerpinen-4-ol Plaque reduction assay (Vero cells), HSV-1 60 [52]\nα-Terpineol Plaque reduction assay (RC-37 cells), HSV-1 22 [52]\nTerpinolene Influenza, HSV-1, HSV-2, ECHO 9, Cox B1, Polio 1, Adeno 3 12 (influenza)\u003e12 (others) [31]\nThujones (α \u0026 β) Plaque reduction assay (RC-37 cells), HSV-1 400 [72]\nThymol Influenza type A (H1N1) virus Active [25]\nThymol Plaque reduction assay (RC-37 cells), HSV-1 30 [52]\n2-Undecanone influenza type A (H1N1) virus 62 [54]\nTable 3 Docking scores, normalized for molecular weight (DSnorm, kJ/mol), of essential oil components with severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) molecular targets.\nCompound MainProtease Endoribo-Nuclease ADP RibosePhosphatase RNA-DependentRNA Polymerase Spike ProteinBinding Domain Angiotensin-Converting Enzyme a\n(E)-Anethole −84.9 −83.0 −97.5 −74.0 −65.2 −83.8\nallo-Aromadendrene −86.6 −86.9 −95.8 −74.9 −66.1 −85.3\nArtemiseole −89.2 −83.4 −96.6 −73.0 −67.8 −78.0\n(R)-Artemisia alcohol −84.3 −78.3 −88.2 −66.8 −61.1 −74.7\n(S)-Artemisia alcohol −86.1 −85.4 −98.5 −69.5 −67.1 −77.4\nArtemisia ketone −91.0 −85.7 −97.9 −71.9 −66.9 −77.3\nAscaridole −74.8 −68.2 −86.0 −65.2 −62.6 −64.4\nBenzyl benzoate −104.9 −96.5 −110.3 −82.5 −74.9 −96.4\n(Z)-trans-α-Bergamotol −98.0 −91.2 −105.9 −71.9 −63.6 −83.6\nBicyclogermacrene −85.9 −88.0 −92.5 −75.6 −68.2 −86.1\nBicyclosesquiphellandrene −79.4 −89.6 −86.0 −61.8 −62.5 −78.2\nα-Bisabolol oxide A −88.5 −87.6 −89.1 −71.5 −63.5 −89.7\nα-Bisabolol oxide B −96.6 −92.2 −101.0 −79.7 −75.2 −95.6\nBisabolone oxide A −93.7 −87.9 −98.2 −73.3 −71.0 −78.7\n(+)-Borneol −77.4 −91.8 −100.1 −74.1 −70.9 −73.3\n(−)-Borneol −71.4 −71.5 −78.4 −56.7 −50.1 −73.7\n(+)-iso-Borneol −75.6 −75.3 −75.9 −60.8 −53.2 −71.8\n(−)-iso-Borneol −73.8 −69.2 −75.6 −54.8 −49.3 −72.4\nα-Bulnesene −95.2 −72.4 −78.4 −57.0 −57.8 −101.7\nδ-Cadinene −91.6 −90.2 −112.6 −75.2 −60.0 −93.4\nτ-Cadinol −92.3 −82.8 −82.5 −69.9 −69.8 −87.8\n(R)-Calamene −92.3 −83.5 −97.4 −69.0 −65.6 −87.3\n(S)-Calamene −88.4 −86.8 −95.9 −70.2 −64.7 −87.5\n(+)-Camphene −85.6 −78.9 −83.2 −64.4 −57.9 −72.2\n(−)-Camphene −77.2 −74.1 −87.1 −66.0 −59.8 −67.1\n(+)-Camphor −75.2 −73.1 −77.9 −63.9 −53.8 −69.4\n(−)-Camphor −72.5 −70.0 −75.6 −64.3 −52.8 −70.8\n(+)-δ-3-Carene −87.9 −78.6 −87.0 −65.0 −72.4 −75.8\n(−)-δ-3-Carene −83.9 −88.0 −90.4 −66.8 −67.3 −73.4\nCarvacrol −84.5 −86.6 −94.8 −74.1 −71.0 −81.2\nCarvacrol methyl ether −85.5 −82.5 −103.1 −74.6 −65.8 −83.7\n(+)-cis−Carveol −87.0 −81.8 −97.7 −76.5 −69.7 −80.4\n(−)-cis−Carveol −85.6 −85.0 −95.6 −76.8 −74.3 −81.2\n(R)-Carvone −87.7 −82.4 −98.2 −74.7 −69.2 −83.4\n(S)-Carvone −86.2 −83.2 −98.9 −73.2 −66.3 −82.2\n(E)-Caryophyllene −81.2 −82.2 −93.9 −73.4 −59.2 −75.1\nCaryophyllene oxide −80.6 −86.7 −97.0 −74.1 −66.5 −83.3\nCedrol −82.3 −84.4 −80.1 −69.7 −58.3 −69.9\nepi-Cedrol −76.4 −88.4 −92.2 −68.5 −55.5 −75.9\nChamazulene −97.6 −96.4 −110.9 −76.9 −73.7 −95.6\n(−)-cis-Chrystanthyl acetate −83.2 −77.5 −87.1 −71.5 −60.2 −80.9\n(−)-trans−Chrysanthenyl acetate −77.0 −81.4 −85.3 −65.9 −68.9 −72.4\n1,8-Cineole −72.7 −67.6 −71.5 −58.1 −58.6 −61.0\n(E)-Cinnamaldehyde −93.1 −85.8 −100.0 −76.4 −73.1 −81.0\n(E)-Cinnamyl acetate −99.4 −88.0 −108.9 −76.9 −80.6 −89.5\n(R)-Citronellal −99.9 −91.6 −105.0 −75.1 −73.3 −88.0\n(S)-Citronellal −98.3 −88.9 −107.4 −72.1 −71.4 −86.2\n(R)-Citronellol −99.9 −90.2 −104.9 −75.7 −72.3 −84.9\n(S)-Citronellol −99.2 −92.2 −107.6 −74.2 −77.4 −85.1\n(R)-Citronellyl formate −105.5 −92.6 −109.9 −72.8 −76.2 −90.5\n(S)-Citronellyl formate −101.5 −96.4 −114.7 −81.9 −78.3 −91.0\nα-Copaene −84.1 −78.9 −85.9 −60.2 −59.6 −77.1\nCostunolide −94.5 −99.2 −110.2 −78.2 −74.9 −92.6\n(R)-Cryptone −86.6 −82.4 −93.5 −68.2 −70.4 −74.8\n(S)-Cryptone −81.5 −82.9 −94.9 −69.8 −70.6 −76.6\nβ-Cubebene −90.8 −92.0 −86.7 −76.0 −71.2 −89.8\nCuminaldehyde −86.2 −80.5 −103.3 −74.9 −67.5 −81.7\nar-Curcumene −105.3 −94.0 −108.6 −82.8 −75.8 −96.4\nCurcumol −83.0 −93.4 −91.2 −73.5 −69.6 −86.0\nCurdione −86.2 −98.1 −99.0 −77.3 −71.7 −92.0\nCurzerene −91.5 −86.0 −104.2 −76.8 −67.6 −90.5\nm-Cymene −83.6 −81.3 −92.8 −72.0 −67.6 −79.0\no-Cymene −83.2 −78.3 −87.7 −63.9 −63.3 −72.9\np-Cymene −79.7 −78.7 −91.0 −70.3 −63.9 −75.4\n(E)-β-Damascenone −85.2 −87.6 −110.2 −73.8 −73.8 −84.8\n(2E,4E)-Decadienal −105.7 −97.7 −112.5 −81.8 −78.7 −90.0\nDodecanal −102.8 −93.9 −101.9 −77.9 −73.3 −94.9\nEremanthin −97.7 −97.7 −98.0 −83.7 −81.3 −100.9\nβ-Eudesmol −97.6 −87.4 −106.5 −75.8 −64.5 −74.7\nγ-Eudesmol −93.6 −89.9 −94.7 −69.4 −66.1 −84.3\nEugenol −93.2 −91.7 −105.2 −80.0 −79.1 −88.4\nEugenol methyl ether −88.5 −85.3 −111.1 −71.7 −68.6 −89.3\nEugenyl acetate −96.3 −89.3 −115.1 −75.6 −70.6 −94.9\n(E,E)-α-Farnesene −115.0 −107.5 −112.8 −86.8 −85.3 −100.3\n(E)-β-Farnesene −115.4 −105.0 −116.3 −87.1 −82.9 −100.7\n(E,E)-Farnesol −112.4 −104.6 −121.4 −89.6 −80.8 −100.9\n(+)-Fenchone −80.0 −80.9 −87.1 −66.1 −60.8 −66.9\n(-)-Fenchone −83.3 −67.5 −86.2 −66.5 −60.9 −68.8\nFlavesone −82.3 −84.0 −95.7 −68.9 −64.4 −78.9\nGeranial −101.7 −90.8 −113.0 −76.1 −74.5 −92.0\nGeraniol −103.5 −98.5 −110.2 −77.4 −76.4 −93.8\nGeranyl formate −105.9 −93.9 −111.4 −80.8 −80.3 −96.2\nGermacrene D −92.1 −96.7 −110.5 −77.1 −73.0 −87.3\nGermacrone −85.1 −97.1 −94.9 −71.6 −67.1 −80.9\nGuiaol −94.1 −92.5 −113.4 −79.2 −79.4 −91.9\nα-Gurjunene −89.9 −83.2 −81.3 −71.5 −61.3 −79.8\nβ-Gurjunene −77.4 −64.1 −81.1 −64.1 −58.0 −75.1\nα-Himachalene −80.4 −89.7 −86.5 −63.7 −67.9 −74.3\nβ-Himachalene −85.5 −81.3 −88.6 −68.1 −62.9 −77.2\nHimachalol −77.2 −88.3 −100.8 −63.6 −63.7 −75.6\nα-Humulene −88.9 −90.9 −89.1 −74.9 −70.6 −86.7\nLeptospermone −85.5 −83.2 −92.9 −71.2 −64.1 −80.0\niso-Leptospermone −86.1 −82.7 −93.7 −69.1 −62.6 −83.5\n(R)-Limonene −82.2 −76.2 −92.0 −72.6 −67.3 −79.0\n(S)-Limonene −82.2 −73.8 −92.2 −72.4 −66.1 −77.5\n(R,S,R)-Limonene oxide −86.3 −77.7 −100.8 −76.7 −68.1 −85.1\n(S,R,R)-Limonene oxide −83.5 −87.4 −89.4 −66.7 −63.4 −76.4\n(S,R,S)-Limonene oxide −84.7 −80.7 −95.8 −74.9 −66.7 −83.8\n(R)-Linalool −96.0 −89.3 −101.4 −70.9 −79.0 −87.0\n(S)-Linalool −100.7 −87.5 −102.1 −71.4 −70.4 −87.8\n(R)-Linalyl acetate −101.4 −88.9 −105.1 −73.0 −74.3 −82.5\n(S)-Linalyl acetate −102.8 −90.8 −106.0 −68.5 −74.5 −82.3\np-Mentha-1(7),8-diene −82.3 −82.2 −94.3 −69.5 −65.9 −79.3\n(+)-Menthol −82.9 −86.2 −95.0 −71.8 −66.6 −77.7\n(-)-Menthol −82.3 −84.5 −95.1 −71.1 −69.2 −79.4\nMenthone −83.2 −77.8 −94.7 −69.3 −70.0 −74.4\niso-Menthone −81.0 −79.8 −97.6 −64.4 −63.5 −80.1\nα-Muurolene −86.9 −81.9 −96.9 −72.0 −66.0 −83.7\n(+)-γ-Muurolene −82.3 −82.9 −83.1 −72.2 −66.6 −84.4\n(-)-γ-Muurolene −88.4 −86.2 −106.7 −74.5 −68.5 −86.8\nMyrcene −98.7 −90.1 −102.2 −74.9 −71.4 −84.3\nNeral −102.6 −91.8 −110.5 −81.5 −72.4 −91.2\n(E)-Nerolidol −110.7 −101.4 −113.8 −83.5 −76.1 −100.6\n(E)-β-Ocimene −97.0 −90.2 −103.6 −76.3 −75.6 −86.7\n(Z)-β-Ocimene −98.3 −88.7 −103.2 −78.6 −73.9 −85.1\nOctanal −89.7 −83.8 −99.5 −71.3 −72.4 −80.5\n(R)-2-Octen-3-ol −88.1 −88.4 −96.6 −71.9 −70.7 −81.9\n(S)-1-Octen-3-ol −94.2 −90.7 −93.4 −77.1 −74.7 −80.0\n3-Octanone −88.9 −85.3 −94.7 −71.7 −72.9 −80.3\nPatchouli alcohol −63.5 −57.1 −66.7 −51.8 −43.0 −67.9\n(R)-Phellandral −87.6 −85.9 −102.5 −74.4 −66.2 −81.1\n(S)-Phellandral −87.7 −83.7 −101.6 −74.4 −66.5 −79.2\n(R)-α-Phellandrene −81.1 −82.9 −92.5 −70.1 −65.3 −76.4\n(S)-α-Phellandrene −81.6 −82.5 −92.3 −69.7 −65.6 −76.6\n(R)-β-Phellandrene −84.4 −83.7 −94.0 −69.8 −65.5 −75.2\n(S)-β-Phellandrene −82.9 −84.5 −94.0 −71.2 −67.5 −77.7\nPhytol −106.3 −94.2 −118.9 −74.9 −75.6 −93.3\nPhytone −106.4 −94.3 −116.9 −79.8 −72.3 −90.4\n(+)-α-Pinene −79.0 −70.7 −79.7 −59.4 −54.6 −63.7\n(-)-α-Pinene −77.3 −70.4 −72.9 −61.3 −54.7 −63.6\n(+)-β-Pinene −76.8 −71.8 −79.4 −63.7 −53.0 −65.2\n(-)-β-Pinene −78.8 −73.6 −73.9 −61.9 −56.1 −64.7\n(+)-Pinocamphone −74.9 −72.6 −79.4 −63.2 −62.4 −66.4\n(-)-Pinocamphone −73.2 −79.3 −81.8 −62.0 −61.4 −67.2\n(+)-iso-Pinocamphone −74.9 −75.0 −74.9 −66.6 −55.1 −66.5\n(-)-iso-Pinocamphone −77.1 −80.7 −77.5 −64.0 −55.6 −68.3\n(+)-cis-Pinocarveol −73.9 −78.1 −79.5 −67.7 −57.4 −70.2\n(-)-cis-Pinocarveol −74.1 −76.5 −78.8 −67.0 −58.6 −66.3\n(+)-trans-Pinocarveol −74.7 −80.5 −78.7 −65.8 −57.2 −70.6\n(-)-trans-Pinocarveol −77.6 −80.0 −82.6 −60.5 −55.5 −70.8\n(+)-Piperitone oxide −82.0 −81.5 −98.5 −66.2 −65.2 −77.8\n(-)-Piperitone oxide −81.6 −83.9 −94.9 −68.6 −60.8 −82.8\n(-)-iso-Pulegol −82.5 −85.1 −98.8 −75.2 −66.7 −79.3\n(R)-Pulegone −84.0 −83.1 −96.1 −66.4 −65.5 −78.3\n(S)-Pulegone −83.6 −78.6 −93.3 −67.2 −66.2 −78.9\nRotundifolone −83.1 −79.0 −96.6 −66.4 −62.1 −80.7\n(+)-Sabinene −86.4 −84.0 −92.2 −70.5 −68.6 −77.4\n(-)-Sabinene −87.8 −85.9 −94.7 −71.5 −69.6 −77.0\ncis-Sabinene hydrate −82.4 −81.1 −92.4 −68.0 −60.8 −78.2\n(Z)-α-Santalol −105.7 −95.3 −108.8 −84.7 −70.7 −95.8\n(E)-β-Santalol −104.8 −95.6 −106.2 −77.0 −70.9 −86.6\n(Z)-β-Santalol −104.4 −94.4 −106.2 −79.8 −73.2 −92.2\nβ-Sesquiphellandrene −103.8 −99.0 −115.7 −84.8 −75.3 −101.1\nSpathulenol −90.7 −88.0 −98.4 −77.8 −67.9 −90.4\n(Z)-Spiroether −111.8 −84.9 −103.1 −87.1 −79.3 −102.0\nγ-Terpinene −81.3 −79.3 −93.2 −71.2 −65.3 −76.6\n(R)-Terpinen-4-ol −80.4 −81.9 −89.5 −69.0 −64.9 −75.3\n(S)-Terpinen-4-ol −82.1 −81.8 −88.0 −70.4 −64.4 −76.4\n(R)-α-Terpineol −82.6 −88.3 −91.6 −65.6 −66.0 −72.6\n(S)-α-Terpineol −88.7 −86.8 −94.1 −71.6 −63.5 −82.0\nTerpinolene −80.7 −80.1 −94.7 −68.8 −63.9 −77.4\n(-)-α-Thujone −87.2 −89.3 −94.5 −66.9 −69.2 −78.1\n(+)-β-Thujone −86.9 −80.5 −94.2 −73.7 −69.7 −79.2\nThymohydroquinone dimethyl ether −89.5 −82.8 −104.6 −73.1 −67.0 −85.0\nThymol −84.4 −87.5 −94.6 −72.9 −70.8 −78.4\n2-Undecanone −101.3 −94.0 −108.3 −78.4 −72.8 −90.2\nValencene −84.7 −81.7 −92.6 −74.4 −68.3 −81.7\n(+)-Verbenone −84.7 −73.2 −82.5 −68.4 −54.8 −71.2\n(-)-Verbenone −83.8 −77.7 −77.4 −65.4 −57.8 −68.0\nViridiflorene −86.8 −90.2 −91.0 −76.3 −69.4 −88.8\nα-Zingiberene −106.4 −100.5 −115.4 −82.7 −71.4 −98.6\na Human angiotensin-converting enzyme 2 (hACE2).\nTable 4 Normalized docking scores ( DSnorm, kJ/mol) of essential oil components with bovine odorant binding protein (BtOBP), cruzain, torpedo acetylcholinesterase (TcAChE), Bacillus anthracis nicotinate mononucleotide adenylytransferase (BaNadD), Russell’s viper phospholipase A2 (DrPLA2), and Escherichia coli l-aspartate aminotransferase (EcAspTA).\nCompound BtOBP Cruzain TcAChE BaNadD DrPLA2 EcAspTA\n1GT3 1ME3 6G1U 3HFJ 1FV0 2Q7W\n(E)-Anethole −90.2 −73.3 −96.8 −112.9 −85.3 −88.1\nallo-Aromadendrene −85.0 −70.6 −92.8 −105.8 −87.8 −79.6\nArtemiseole −84.8 −74.2 −84.2 −90.6 −68.0 −71.7\n(R)-Artemisia alcohol −88.4 −68.3 −89.5 −94.8 −80.7 −81.5\n(S)-Artemisia alcohol −86.1 −74.0 −94.8 −101.4 −82.5 −81.4\nArtemisia ketone −93.1 −77.3 −91.5 −107.9 −87.8 −80.6\nAscaridole −79.7 −54.4 −72.1 −79.7 −75.0 −65.3\nBenzyl benzoate −105.0 −82.8 −115.8 −128.1 −97.3 −89.9\n(Z)-trans-α-Bergamotol −1 00.7 −73.6 −107.0 −94.2 −92.6 −85.8\nBicyclogermacrene −97.5 −82.4 −95.6 −105.5 −89.7 −89.0\nBicyclosesquiphellandrene −92.2 −52.5 −91.2 −110.7 −88.4 −75.7\nα-Bisabolol oxide A −94.7 −66.1 −102.8 −102.6 −77.1 −82.7\nα-Bisabolol oxide B −104.6 −90.4 −107.0 −121.9 −94.2 −89.8\nBisabolone oxide A −100.1 −71.9 −96.8 −84.7 −81.2 −86.7\n(+)-Borneol −72.5 −51.0 −72.0 −47.8 −61.4 −62.5\n(-)-Borneol −78.3 −53.1 −70.8 −49.0 −63.3 −56.2\n(+)-iso-Borneol −73.7 −55.6 −74.6 −31.0 −60.9 −59.7\n(-)-iso-Borneol −73.2 −55.3 −77.7 −52.6 −51.0 −57.4\nα-Bulnesene −93.4 −89.3 −109.3 −115.7 −94.4 −95.3\nδ-Cadinene −79.5 −86.8 −105.1 −116.8 −94.8 −82.3\nΤ-Cadinol −87.8 −71.8 −117.7 −121.7 −86.0 −87.0\n(R)-Calamene −80.3 −84.4 −116.5 −120.4 −91.3 −87.7\n(S)-Calamene −80.1 −82.5 −116.2 −121.8 −93.0 −88.3\n(+)-Camphene −79.0 −62.1 −77.0 −75.9 −69.3 −67.5\n(-)-Camphene −77.7 −62.8 −75.2 −77.4 −71.3 −70.6\n(+)-Camphor −76.0 −57.0 −75.0 −49.0 −53.5 −54.1\n(-)-Camphor −80.0 −54.1 −74.4 −52.9 −61.2 −56.4\n(+)-δ-3-Carene −80.4 −64.2 −80.6 −88.0 −71.8 −72.5\n(-)-δ-3-Carene −82.0 −68.9 −84.4 −90.2 −72.8 −72.9\nCarvacrol −82.4 −77.7 −94.8 −106.7 −81.6 −87.5\nCarvacrol methyl ether −85.6 −79.3 −96.6 −111.5 −84.2 −93.6\n(+)-cis-Carveol −89.1 −77.3 −96.9 −109.4 −81.3 −87.6\n(-)-cis-Carveol −89.0 −82.1 −95.5 −109.0 −83.2 −89.4\n(R)-Carvone −86.0 −80.7 −94.6 −109.9 −83.5 −91.5\n(S)-Carvone −88.0 −77.2 −94.1 −105.9 −82.8 −87.2\n(E)-Caryophyllene −87.3 −60.4 −88.1 −87.3 −87.4 −78.6\nCaryophyllene oxide −95.1 −73.1 −90.1 −97.0 −83.8 −77.8\nCedrol −87.7 −63.1 −96.4 −84.4 −86.3 −70.9\nepi-Cedrol −84.0 −59.7 −83.3 −86.7 −80.0 −76.2\nChamazulene −95.2 −89.2 −123.0 −132.1 −98.9 −101.6\n(-)-cis-Chrystanthyl acetate −85.8 −63.7 −89.8 −73.8 −76.5 −71.5\n(-)-trans-Chrysanthenyl acetate −80.9 −69.7 −82.4 −78.5 −76.5 −68.6\n1,8-Cineole −69.3 −51.1 −73.2 −54.4 −49.4 −47.3\n(E)-Cinnamaldehyde −87.7 −77.6 −98.2 −110.1 −85.7 −89.5\n(E)-Cinnamyl acetate −95.9 −88.2 −107.4 −132.5 −94.6 −103.1\n(R)-Citronellal −98.1 −90.5 −109.3 −120.7 −88.3 −105.7\n(S)-Citronellal −95.0 −89.7 −108.5 −123.3 −86.9 −104.1\n(R)-Citronellol −91.0 −90.0 −108.2 −122.4 −88.6 −107.7\n(S)-Citronellol −92.5 −91.9 −108.5 −122.0 −90.3 −100.3\n(R)-Citronellyl formate −98.0 −93.5 −118.7 −129.5 −87.5 −108.5\n(S)-Citronellyl formate −99.7 −95.1 −111.2 −135.6 −91.5 −94.8\nα-Copaene −88.9 −69.9 −84.6 −78.7 −81.7 −61.9\nCostunolide −106.8 −87.5 −116.7 −120.1 −100.3 −89.1\n(R)-Cryptone −74.9 −68.1 −92.2 −100.0 −78.5 −80.8\n(S)-Cryptone −79.0 −68.5 −91.6 −100.7 −82.7 −79.6\nβ-Cubebene −99.8 −67.2 −106.9 −112.2 −93.9 −94.8\nCuminaldehyde −84.9 −79.1 −95.3 −109.1 −90.1 −89.5\nar-Curcumene −98.1 −87.5 −116.0 −125.7 −94.1 −95.3\nCurcumol −90.1 −67.6 −100.4 −88.0 −87.6 −81.5\nCurdione −96.4 −75.1 −99.3 −116.3 −91.0 −78.7\nCurzerene −96.4 −80.3 −109.4 −89.7 −91.1 −86.4\nm-Cymene −78.9 −73.1 −96.1 −99.1 −76.6 −88.0\no-Cymene −77.0 −61.9 −89.8 −97.8 −76.2 −77.2\np-Cymene −82.8 −73.2 −91.3 −96.8 −80.9 −84.3\n(E)-β-Damascenone −90.1 −80.5 −100.7 −105.4 −88.9 −80.0\n(2E,4E)-Decadienal −96.4 −87.0 −110.4 −129.7 −95.8 −114.8\nDodecanal −95.8 −83.7 −110.3 −127.3 −89.2 −108.9\nEremanthin −80.1 −87.9 −121.3 −132.4 −98.7 −91.8\nβ-Eudesmol −95.2 −76.1 −98.6 −114.1 −85.3 −87.1\nγ-Eudesmol −94.9 −78.2 −106.1 −105.2 −89.7 −89.1\nEugenol −90.4 −82.4 −103.9 −119.3 −87.3 −98.8\nEugenol methyl ether −93.6 −78.1 −106.3 −116.8 −89.3 −94.4\nEugenyl acetate −94.9 −83.4 −109.2 −126.1 −100.1 −104.6\n(E,E)-α-Farnesene −115.5 −103.7 −129.8 −131.8 −101.2 −111.4\n(E)-β-Farnesene −112.1 −103.2 −122.7 −131.8 −105.3 −108.6\n(E,E)-Farnesol −116.8 −96.2 −133.0 −135.6 −100.5 −109.0\n(+)-Fenchone −78.4 −60.5 −79.5 −79.8 −62.4 −69.9\n(-)-Fenchone −80.3 −61.5 −81.0 −84.2 −65.5 −60.7\nFlavesone −87.1 −56.0 −88.6 −92.1 −85.2 −80.3\nGeranial −96.5 −94.9 −111.7 −119.3 −92.1 −101.5\nGeraniol −95.5 −93.6 −109.7 −118.0 −94.3 −107.3\nGeranyl formate −100.2 −89.7 −115.4 −128.3 −94.8 −114.1\nGermacrene D −102.4 −88.8 −109.9 −116.5 −93.7 −90.0\nGermacrone −92.4 −68.3 −94.5 −102.9 −88.3 −80.0\nGuiaol −100.8 −88.5 −113.3 −107.5 −92.6 −94.0\nα-Gurjunene −80.6 −61.6 −84.6 −100.0 −83.6 −78.1\nβ-Gurjunene −89.3 −38.8 −80.3 11.3 −77.6 −71.1\nα-Himachalene −89.2 −67.9 −83.9 −96.3 −87.6 −73.4\nβ-Himachalene −81.9 −65.4 −96.1 −110.8 −91.4 −76.8\nHimachalol −91.5 −64.1 −81.2 −24.7 −81.7 −66.3\nα-Humulene −94.0 −80.0 −89.9 −113.6 −89.2 −82.5\nLeptospermone −89.6 −64.0 −92.2 −102.7 −88.8 −80.7\niso-Leptospermone −92.8 −63.0 −90.1 −99.4 −86.2 −78.2\n(R)-Limonene −86.2 −75.7 −92.4 −99.6 −81.7 −86.8\n(S)-Limonene −84.9 −77.6 −93.4 −99.8 −83.3 −87.3\n(R,S,R)-Limonene oxide −87.1 −76.0 −93.2 −110.7 −84.9 −86.3\n(S,R,R)-Limonene oxide −84.6 −68.8 −85.0 −84.3 −76.2 −69.8\n(S,R,S)-Limonene oxide −91.2 −73.8 −97.4 −93.6 −85.1 −87.9\n(R)-Linalool −95.5 −89.9 −116.6 −112.4 −90.3 −89.9\n(S)-Linalool −93.0 −88.9 −110.1 −111.9 −91.0 −95.7\n(R)-Linalyl acetate −96.9 −87.1 −107.1 −112.5 −87.1 −95.2\n(S)-Linalyl acetate −100.0 −90.5 −110.2 −114.3 −86.6 −87.1\np-Mentha-1(7),8-diene −83.3 −74.4 −93.6 −100.0 −82.9 −84.9\n(+)-Menthol −86.1 −66.4 −98.6 −106.1 −79.2 −90.8\n(-)-Menthol −81.0 −68.9 −97.5 −106.3 −80.5 −89.7\nMenthone −82.4 −72.0 −92.6 −98.2 −82.8 −83.5\niso-Menthone −79.9 −64.8 −88.2 −102.4 −75.1 −82.0\nα-Muurolene −91.2 −79.9 −95.6 −113.7 −90.0 −82.8\n(+)-γ-Muurolene −85.2 −77.0 −98.7 −113.9 −93.2 −78.7\n(-)-γ-Muurolene −83.1 −83.4 −96.9 −106.3 −82.9 −80.5\nMyrcene −90.4 −88.8 −109.0 −112.7 −90.3 −101.1\nNeral −95.1 −94.1 −111.1 −122.8 −90.9 −105.4\n(E)-Nerolidol −111.5 −101.8 −131.9 −131.3 −99.6 −110.5\n(E)-β-Ocimene −91.8 −89.4 −104.6 −116.4 −89.0 −97.0\n(Z)-β-Ocimene −89.7 −90.6 −106.8 −112.1 −90.3 −94.4\nOctanal −85.8 −79.8 −97.6 −112.0 −85.7 −102.7\n(R)-2-Octen-3-ol −84.3 −81.5 −106.9 −107.1 −83.3 −101.1\n(S)-1-Octen-3-ol −84.5 −82.4 −108.4 −105.9 −85.0 −99.5\n3-Octanone −84.2 −82.5 −102.6 −111.6 −82.9 −101.8\nPatchouli alcohol −75.1 −41.4 −71.1 100.1 −10.1 −49.2\n(R)-Phellandral −92.3 −79.3 −97.4 −108.1 −88.9 −89.5\n(S)-Phellandral −92.9 −79.9 −96.1 −109.2 −88.9 −88.8\n(R)-α-Phellandrene −84.0 −69.7 −94.7 −100.8 −82.4 −83.8\n(S)-α-Phellandrene −84.3 −69.6 −93.5 −99.4 −82.6 −80.6\n(R)-β-Phellandrene −82.2 −69.9 −93.5 −102.0 −80.6 −84.1\n(S)-β-Phellandrene −83.8 −69.0 −93.2 −100.5 −80.2 −81.2\nPhytol −112.8 −93.8 −132.4 −134.7 −102.4 −112.9\nPhytone −117.8 −92.1 −124.5 −131.1 −99.7 −107.2\n(+)-α-Pinene −74.2 −58.0 −73.4 −62.4 −62.5 −54.4\n(-)-α-Pinene −72.8 −58.3 −70.4 −64.6 −61.7 −57.2\n(+)-β-Pinene −70.9 −57.8 −74.0 −64.1 −60.9 −55.5\n(-)-β-Pinene −73.5 −58.4 −73.1 −65.0 −63.7 −57.0\n(+)-Pinocamphone −76.5 −58.2 −73.6 −53.1 −55.4 −63.6\n(-)-Pinocamphone −76.6 −66.1 −76.5 −65.9 −72.3 −62.7\n(+)-iso-Pinocamphone −75.3 −59.0 −76.6 −54.0 −59.1 −58.1\n(-)-iso-Pinocamphone −76.2 −59.6 −76.7 −56.4 −65.8 −56.2\n(+)-cis-Pinocarveol −75.7 −58.2 −75.2 −51.7 −57.5 −58.1\n(-)-cis-Pinocarveol −75.7 −63.9 −73.5 −52.5 −66.3 −54.5\n(+)-trans-Pinocarveol −77.5 −60.6 −76.5 −71.1 −63.9 −61.4\n(-)-trans-Pinocarveol −72.4 −58.6 −77.2 −71.4 −56.3 −62.6\n(+)-Piperitone oxide −88.5 −70.5 −100.5 −104.2 −80.4 −78.0\n(-)-Piperitone oxide −86.0 −73.6 −99.6 −104.5 −80.7 −83.8\n(-)-iso-Pulegol −85.1 −72.0 −93.5 −106.7 −83.5 −93.8\n(R)-Pulegone −81.8 −69.9 −90.3 −103.9 −78.4 −74.4\n(S)-Pulegone −79.7 −69.6 −89.3 −99.9 −81.5 −76.4\nRotundifolone −86.1 −72.1 −96.1 −100.0 −82.4 −72.1\n(+)-Sabinene −87.9 −66.6 −84.5 −92.1 −80.5 −78.2\n(-)-Sabinene −79.7 −68.4 −91.4 −96.0 −80.8 −75.8\ncis-Sabinene hydrate −88.1 −70.2 −84.5 −91.1 −72.3 −68.1\n(Z)-α-Santalol −108.5 −85.6 −113.4 −106.8 −96.8 −90.7\n(E)-β-Santalol −105.0 −90.2 −110.6 −113.3 −94.3 −94.0\n(Z)-β-Santalol −108.0 −85.3 −110.4 −110.9 −96.5 −92.6\nβ-Sesquiphellandrene −103.9 −92.2 −116.6 −127.5 −99.4 −98.3\nSpathulenol −95.9 −94.8 −97.7 −102.8 −84.3 −102.2\n(Z)-Spiroether −112.8 −85.5 −124.3 −136.1 −101.5 −102.9\nγ-Terpinene −84.3 −74.9 −93.4 −98.7 −82.8 −85.9\n(R)-Terpinen-4-ol −87.3 −66.7 −81.5 −94.0 −80.2 −72.2\n(S)-Terpinen-4-ol −87.1 −67.2 −78.9 −92.3 −80.2 −71.7\n(R)-α-Terpineol −82.0 −68.0 −80.3 −82.2 −77.6 −71.3\n(S)-α-Terpineol −76.9 −75.5 −103.6 −101.7 −86.6 −84.9\nTerpinolene −83.1 −69.8 −89.0 −101.8 −84.8 −72.9\n(-)-α-Thujone −81.4 −66.2 −84.9 −93.4 −72.6 −74.1\n(+)-β-Thujone −87.6 −66.4 −89.9 −102.9 −71.7 −86.9\nThymohydroquinone dimethyl ether −86.3 −75.8 −103.7 −116.0 −85.3 −95.5\nThymol −84.4 −70.8 −96.4 −107.1 −79.7 −91.8\n2-Undecanone −94.5 −90.2 −110.0 −129.7 −91.9 −107.6\nValencene −96.7 −75.1 −103.3 −114.7 −87.8 −76.6\n(+)-Verbenone −74.3 −64.5 −79.3 −71.6 −63.9 −72.3\n(-)-Verbenone −73.5 −63.1 −78.0 −65.3 −64.8 −59.3\nViridiflorene −81.9 −68.6 −102.1 −106.9 −73.1 −81.9\nα-Zingiberene −108.3 −90.9 −113.8 −123.4 −97.7 −99.9 "}

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Oils as Antiviral Agents, Potential of Essential Oils to Treat SARS-CoV-2 Infection: An In-Silico Investigation\n\nAbstract\nEssential oils have shown promise as antiviral agents against several pathogenic viruses. In this work we hypothesized that essential oil components may interact with key protein targets of the 2019 severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2). A molecular docking analysis was carried out using 171 essential oil components with SARS-CoV-2 main protease (SARS-CoV-2 Mpro), SARS-CoV-2 endoribonucleoase (SARS-CoV-2 Nsp15/NendoU), SARS-CoV-2 ADP-ribose-1″-phosphatase (SARS-CoV-2 ADRP), SARS-CoV-2 RNA-dependent RNA polymerase (SARS-CoV-2 RdRp), the binding domain of the SARS-CoV-2 spike protein (SARS-CoV-2 rS), and human angiotensin−converting enzyme (hACE2). The compound with the best normalized docking score to SARS-CoV-2 Mpro was the sesquiterpene hydrocarbon (E)-β-farnesene. The best docking ligands for SARS−CoV Nsp15/NendoU were (E,E)-α-farnesene, (E)-β-farnesene, and (E,E)−farnesol. (E,E)−Farnesol showed the most exothermic docking to SARS-CoV-2 ADRP. Unfortunately, the docking energies of (E,E)−α-farnesene, (E)-β-farnesene, and (E,E)−farnesol with SARS-CoV-2 targets were relatively weak compared to docking energies with other proteins and are, therefore, unlikely to interact with the virus targets. However, essential oil components may act synergistically, essential oils may potentiate other antiviral agents, or they may provide some relief of COVID-19 symptoms.\n\n1. Introduction\nThe 2019 severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) is a newly emerging respiratory illness. The epidemic started in December 2019 in Wuhan, China, and has rapidly spread throughout China and the world and is now a global pandemic. SARS-CoV-2 can be efficiently transmitted among humans and has shown a high degree of morbidity and mortality [1,2]. As of April 20, 2020, the worldwide number of infected individuals was 2,544,792, with as many as 175,694 deaths [3]. There are currently no approved vaccines available for the prevention of SARS-CoV-2 infection and only just recently, remdesivir has received “emergency use authorization” for treatment of COVID-19 in the United States; therefore, there is an urgent demand for potential chemotherapeutic agents to treat this disease.\nEssential oils have been screened against several pathogenic viruses (Table 1), including influenza and other respiratory viral infections. Influenza is an infectious respiratory disease caused by one of three types of influenza viruses, type A, type B, or type C [4]. The most significant in terms of human morbidity and mortality is influenza virus type A, which is found in several bird and mammal species [5]. Several different serotypes of influenza type A have caused global flu pandemics [6]: H1N1, which caused the Spanish flu in 1918 (40–50 million deaths worldwide) [7] and the swine flu in 2009 [8]; the Asian flu of 1957–1958 (ca. 1.5 million deaths worldwide) was caused by influenza A H2N2 [8]; serotype H3N2 caused the Hong Kong flu in 1968 [9]; and H5N1, which caused the bird flu in 2004 [10]. Influenza virus type B, however, is largely confined to human hosts [11].\nOne study evaluated the in vitro antiviral effect against influenza type A (H1N1) of commercial essential oils that included cinnamon (Cinnamomum zeylanicum), bergamot (Citrus bergamia), lemongrass (Cymbopogon flexuosus), thyme (Thymus vulgaris), and lavender (Lavandula angustifolia). The oils were tested in the liquid phase at a concentration of 0.3% and in the vapor phase. The oils of cinnamon, bergamot, thyme, and lemongrass displayed 100% inhibition of H1N1 in the liquid phase, while the inhibition for lavender essential oil was 85%. However, in the vapor phase, 100% inhibition was observed only for cinnamon leaf essential oil after 30 min of exposure. The bergamot, lemongrass, thyme, and lavender essential oils displayed inhibition rates of 95%, 90%, 70%, and 80%, respectively [12].\nCinnamomum zeylanicum leaf oil is characterized by eugenol (75–85%), followed by smaller amounts of linalool (1.6–8.5%), and benzyl benzoate (0.1–8.3%) [13,14,15]. Bergamot oil is rich in limonene (23–55%), linalool (2–37%), and linalyl acetate (12–41%), with lesser quantities of β-pinene (up to 10%) and γ-terpinene (up to 10%) [16,17,18,19,20]. Geranial (48–54%) and neral (29–33%) have been reported as the major components of C. flexuosus, but many chemotypes, cultivars, and variants have been reported for C. flexuosus [21,22].\nIn the literature, there have been at least 20 different chemotypes identified for thyme essential oil. The “typical” thyme essential oil presents a thymol content of 45% (range 31–50%), with significant concentrations of p-cymene (0.1–26.6%, average = 15.6%) and γ-terpinene (up to 22.8%, average = 9.3%). In addition, there are several other chemotypes of T. vulgaris rich in thymol and/or carvacrol [23]. Thymol has been identified as an anti-influenza agent against influenza type A and parainfluenza type 3 virus [24,25]. Lavandula angustifolia essential oil is rich in linalyl acetate (37.0–43.6%), linalool (19.7–39.1%), geraniol (up to 9.3%), β-caryophyllene (up to 5.1%), terpinen-4-ol (up to 14.9%), lavandulyl acetate (up to 5.5%), and borneol (up to 6.4%) [26,27,28,29].\nAnother essential oil with notable anti-influenza effects is tea tree, which is extracted from the leaves of Melaleuca alternifolia (Myrtaceae). Commercial tea tree oil is composed of terpinen-4-ol (30–48%), γ-terpinene (10–28%), α-terpinene (5–13%), 1,8-cineole (up to 15%), terpinolene (1.5–5%), p-cymene (0.5–12%), α-pinene (1–6%), and α-terpineol (1.5–8%) [30]. Tea tree oil showed 100% inhibition of influenza type A (H1N1) virus at 0.01% concentration and a median inhibitory concentration (IC50) of 6 μg/mL [31,32]. In addition, 30 min exposure of type A (H11N9) virus to tea tree oil vapor caused 100% inhibition [33]. The tea tree oil components, terpinen-4-ol, terpinolene, and α-terpineol, have shown anti-influenza virus activity against type A (H1N1), with IC50 values of 25, 12, and 250 μg/mL, respectively. α-Terpinene, γ-terpinene, and p-cymene were inactive, however [31].\nAvian influenza viruses (H5N1) exhibit both high and low virulence in numerous mammalian species, highlighting the connection between the route of inoculation and virus pathogenicity [34]. Since 2003, there have been over 600 documented cases of human infection with H5N1 viruses, with most cases among young, previously healthy individuals [35]. The essential oils extracted from Citrus reshni leaves and peel (unripe and ripe fruits) were tested against H5N1 virus by plaque reduction assay. The oils showed moderate inhibition of the H5N1 virus at a concentration of 2.5 μL/mL. Sabinene (40.5%), linalool (23.3%), and terpinen-4-ol (8.3%) were the main constituents in the leaf oil while limonene (82.4%, 91.6%) was the main compound in the fruit peel essential oils (unripe and ripe, respectively) [36].\nThe essential oil of leaves of Fortunella margarita is rich in the sesquiterpenoids β-eudesmol (28.3%), α-muurolene (10.3%), β-gurjunene (10.0%), γ-eudesmol (8.4%), and γ-muurolene (6.6%) while the essential oil extracted from the fruits showed monterpenoids as the main components, α-terpineol (55.5%), carvone (5.7%), and carveol (5.5%). Both samples were tested for antiviral activity against avian influenza (H5N1) virus, and the obtained results revealed that the fruit essential oil was more effective (80% virus inhibition by the MTT (3-(4,5-dimethylthiazol-2-yl)-2,5-diphenyltetrazolium bromide) assay using Madin−Darby canine kidney (MDCK) cells for virus propagation). The IC50 values obtained for the leaf and fruit essential oils were 38.89 and 6.77 μg/mL, respectively [53].\nDengue fever, a mosquito−borne disease, is caused by dengue virus (DENV) which includes four major serotypes (DENV-1, -2, -3, and -4). Some serotypes cause more severe diseases than others; severe dengue is associated with secondary infections by a different serotype. Dengue disease is a major public health problem in developing tropical countries and has being continuously spreading to new geographical areas [92]. The essential oils of two species of Lippia were assayed against four dengue serotypes (DENV-1, DENV-2, DENV-3, DENV-4) [61]. The IC50 values for Lippia alba oil, rich in carvone (39.7%), limonene (30.6%), and bicyclosesquiphellandrene (8.9%), were between 0.4 and 32.6 μg/mL. However, the Lippia citrodora essential oil, composed of geranial (18.9%), neral (15.6%), limonene (10.7%), and 1,8-cineole (5.0%), showed the best activity, with IC50 values varying from 1.9 to 33.7 μg/mL. No viral inhibitory effect was observed by addition of the essential oil after virus adsorption; the inhibitory effect of the essential oil seemed to cause direct virus inactivation before adsorption on the host cell.\nThe essential oils of seven aromatic plants from Córdoba, San Luis, and San Juan provinces (Argentina) were screened for cytotoxicity and in vitro inhibitory activity against dengue virus type 2 (DENV−2) [38]. The oils of Jungia polita and Buddleja cordobensis were composed of caryophyllene oxide (9.18%, 32.1%) and β-caryophyllene (8.13%, 16.5%) as the major compounds. However, these oils displayed different IC50 values (86.4 and 39.8 μg/mL, respectively). The other samples were composed mostly of monoterpenes and displayed lower activity, except Pectis odorata oil, which presented limonene (50.2%), neral (27.2%), and geranial (23.6%) as the major compounds and an IC50 value of 39.6 μg/mL. In addition, the essential oils of Artemisia mendozana, rich in camphor (22.4%), artemisole (11.7%), and artemisia alcohol (10.8%); Gailardia megapotamica composed of β-pinene (35.5%), spathulenol (10.7%), and germacrene D (6.8%); and Heterothalamus alienus characterized by β-pinene (35.5%), spathulenol (10.7%), and germacrene D (6.8%), showed an average IC50 value of 130.63 μg/mL.\nYellow fever (YF), caused by yellow fever virus (YFV), has historically been considered one of the most dangerous infectious diseases. YFV is transmitted to humans via mosquitoes of the Haemogogus, Sabethes, and Aedes genera. Annually, there are approximately 80,000–200,000 YFV cases worldwide, with a case fatality rate (CFR) ranging from 20–60% [93,94]. Essential oils of Lippia species and their main compounds have been tested against yellow fever virus (YFV) in Vero cells. The oil of Lippia origanoides showed carvacrol (44.0%), thymol (15.0%), and γ-terpinene (10.0%) as the main compounds and displayed 100% inhibition at a concentration of 11.1 μg/mL [43]. However, in the same study, the oil of L. alba displayed 100% inhibition at a concentration of 100.0 μg/mL. The major compounds were carvone (51.0%), limonene (33.0%), and bicyclosesquiphellandrene (7.0%). The essential oil of L. alba with a similar chemical composition, carvone (39.7%), limonene (30.6%), and bicyclosesquiphellandrene (8.9%), displayed an IC50 value of 4.3 μg/mL against YFV when tested in Vero cells using the MTT assay [62]. The essential oil of L. citriodora, dominated by geranial (18.9%), neral (15.6%), and limonene (10.7%), did not display a statistical difference in comparison to citral, with IC50 values of 19.4 and 17.6 μg/mL, respectively [62].\nIn addition to essential oils, several individual essential oil components have been screened for antiviral activity (Table 2).\nBecause of the activities of several essential oils and essential oil components against human pathogenic viruses, we hypothesized that essential oil components may be potentially useful as antiviral agents against SARS-CoV-2. In this work, we carried out a molecular docking analysis of the major components of essential oils that exhibit antiviral activity (Table 1 and Table 2) with known SARS-CoV-2 protein targets.\n\n2. Results and Discussion\nSeveral proteins have been identified for severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2), which may serve as potential targets for chemotherapeutic intervention in coronavirus disease 2019 (COVID-19). These protein targets include SARS-CoV-2 main protease (SARS-CoV-2 Mpro), SARS-CoV-2 endoribonucleoase (SARS-CoV-2 Nsp15/NendoU), SARS-CoV-2 ADP−ribose−1″−phosphatase (SARS-CoV-2 ADRP), SARS-CoV-2 RNA-dependent RNA polymerase (SARS-CoV-2 RdRp), the binding domain of the SARS-CoV-2 spike protein (SARS-CoV-2 rS), and human angiotensin−converting enzyme (hACE2). There have already been several molecular docking studies on these macromolecular targets. Several groups have carried out molecular docking of natural product libraries with SARS-CoV-2 Mpro [102,103,104,105]. Additionally, commercially available drugs have also been examined using in silico methods [106,107].\nA molecular docking study was carried out with 171 essential oil components with SARS-CoV-2 Mpro (PDB: 5R7Z, 5R80, 5R81, 5R82, 5R83, 5R84, 6LU7, 6M03, and 6Y84), SARS-CoV-2 Nsp15/NendoU (PDB: 6VWW, 6W01, and 6W02), SARS-CoV-2 rS (PDB: 6M0J, 6M17, 6VX1, and 6VW1), and SARS-CoV-2 RdRp (PDB: 6M71). The best docking scores are summarized in Table 3.\nThe main protease, SARS-CoV-2 Mpro, is a cysteine protease that is essential for processing the polyproteins that are translated from the coronavirus RNA [108]. The substrate binding site of the enzyme is a cleft flanked by Gln189, Met49, Pro168, Glu166 and His41; the active site is Cys145 and His41. The compound with the best normalized docking score to SARS-CoV-2 Mpro was the sesquiterpene hydrocarbon (E)-β-farnesene (DSnorm = −115.4 kJ/mol). Other essential oil components showing good docking scores with SARS-CoV-2 Mpro were (E,E)-α-farnesene (DSnorm = −115.0 kJ/mol), (E,E)-farnesol (DSnorm = −112.4 kJ/mol), and (E)-nerolidol (DSnorm = −110.7 kJ/mol). The sesquiterpene hydrocarbons (E,E)-α-farnesene and (E)-β-farnesene occupy the substrate binding site, flanked by Gln189, Arg188, Met165, His41, and Asp 187 (Figure 1). The lowest-energy docked poses of both (E,E)-farnesol and (E)-nerolidol showed hydrogen bonding of the alcohol moiety to Gln192 and Thr190 and, in the case of (E)-nerolidol, also with GLN189 and ARG188 (Figure 2).\nNon-structural protein 15 (Nsp15) of SARS-CoV-2 is an endoribonuclease that preferentially cleaves RNA at uridylate. Furthermore, it has been shown that SARS-CoV Nsp15/NendoU is required for successful viral infection [109]. The best docking ligands for SARS-CoV Nsp15/NendoU are (E,E)-α-farnesene (DSnorm = −107.5 kJ/mol), (E)-β-farnesene (DSnorm = −105.0 kJ/mol), (E,E)-farnesol (DSnorm = −104.6 kJ/mol), and (E)-nerolidol (DSnorm = −101.6 kJ/mol). All of these sesquiterpenoids preferentially docked into a binding site formed by amino acid residues Gln347, Ile328, Val276, Ser274, Thr275, Ser329, Asn74, Asn75, Glu327, and Lys71 (Figure 3). In addition to van der Waals interactions, (E,E)-farnesol showed hydrogen-bonding interactions with Ser329 and Glu327, while (E)-nerolidol hydrogen bonded with Asn75 and Lys71 (Figure 3). Unfortunately, the docking scores for these ligands as well as the scores of the other essential oil components with this protein are too low for it to be considered a viable target (see Table 3).\nADP ribose phosphatase (ADRP) serves to convert ADP-ribose 1″-monophosphate (Appr-1″-p) to ADP-ribose (Appr), which serves to regulate virus replication [110]. This enzyme may be dispensable in SARS-CoV-2, however [111]. Nevertheless, (E,E)-farnesol showed the most exothermic docking to SARS-CoV-2 ADRP with DSnorm = −121.4 kJ/mol. The binding site in SARS-CoV-2 ADRP is surrounded by Phe132, Asn40, Ile131, Ala38, and Ala39, with hydrogen-bonded interactions between the ligand alcohol and Asn40 (Figure 4). Additional essential oil components with good docking scores with SARS-CoV-2 ADRP include the sesquiterpene hydrocarbons (E)-β-farnesene (DSnorm = −116.3 kJ/mol), (E,E)-α-farnesene (DSnorm = −114.2 kJ/mol), β-sesquiphellandrene (DSnorm = −115.7 kJ/mol), and α-zingiberene (DSnorm = −115.4 kJ/mol); the diterpenoids phytol (DSnorm = −118.9 kJ/mol) and phytone (DSnorm = −116.9 kJ/mol); and the phenylpropanoid eugenyl acetate (DSnorm = −115.4 kJ/mol). Not surprisingly, β-sesquiphellandrene and α-zingiberene adopted the same docking orientation in the binding site of the enzyme (Figure 5A). Similarly, phytol and phytone occupy the same location in the binding site (Figure 5B).\nRNA-dependent RNA polymerase catalyzes RNA replication from an RNA template and is an essential enzyme in RNA viruses. Because these enzymes are crucial in viral replication, they are viable targets in antiviral chemotherapy [112]. Molecular docking of essential oil components with SARS-CoV-2 RdRp showed only weak docking with this enzyme target (Table 3). The ligand with the best docking score was (E,E)-farnesol, with DSnorm = −89.6 kJ/mol.\nThe SARS-CoV-2 spike protein serves to attach to angiotensin-converting enzyme 2 (ACE2) of the human cell to be invaded. The interface between SARS-CoV-2 rS and human ACE2 would be a promising target to prevent binding of SARS-CoV-2 rS to human ACE2 [113,114]. The best docking ligands with human ACE2, i.e., normalized docking scores \u003c -100 kJ/mol (α-bulnesene, eremanthin, (E,E)-α-farnesene, (E)-β-farnesene, (E,E)-farnesol, (E)-nerolidol, β-sesquiphellandrene, and (Z)-spiroether), all show docking preference to a cavity removed from the interaction interface between the SARS-CoV-2 spike protein and ACE2 (Figure 6). This cavity is a pocket surrounded by residues Pro565, Leu95, Val209, Asn210, Leu91, Lys94, Glu208, and Glu564. Because of the remote location of docking with ACE2, it is predicted that interaction of essential oil components with ACE2 will not prevent protein–protein interaction between the SARS-CoV-2 spike protein and human ACE2.\nOn the other hand, the lowest energy poses of essential oil components showing the strongest docking (\u003c−80 kJ/mol; (E)-cinnamyl acetate, eremanthin, (E,E)-α-farnesene, (E)-β-farnesene, (E,E)-farnesol, and geranyl formate) with the binding domain of the SARS-CoV-2 spike protein do lie at the interface between the SARS-CoV-2 spike protein and human ACE2 (Figure 6). This docking site is a hydrophobic pocket formed by Tyr505, Tyr495, Asn501, Arg403, Tyr453, and Gly502. Unfortunately, the docking energies at this site are too weak and are unlikely, therefore, to disrupt binding between SARS-CoV-2 rS and human ACE2.\nIn order to compare docking scores of the essential oil components with other proteins, docking was also carried out with six randomly selected non-virus proteins: Bovine odorant binding protein (BtOBP, PDB: 1GT3), cruzain (PDB: 1ME3), torpedo acetylcholinesterase (TcAChE, PDB: 6G1U), Bacillus anthracis nicotinate mononucleotide adenylytransferase (BaNadD, PDB: 3HFJ), Russell’s viper phospholipase A2 (DrPLA2, PDB: 1FV0), and Escherichia coli l-aspartate aminotransferase (EcAspTA, PDB: 2Q7W). Docking scores for these proteins are summarized in Table 4.\nThe docking results of the essential oil components with the six randomly selected proteins indicate the best docking ligands to SARS-CoV-2 targets (i.e., (E,E)-α-farnesene, (E)-β-farnesene, and (E,E)-farnesol) have better docking energies with other proteins. These three sesquiterpenes have docking energies of −129.8, −122.7, and −133.0 kJ/mol with TcAChE, respectively, and −131.8, −131.8, and −135.6 kJ/mol, respectively, with BaNadD. Indeed, most of the essential oil ligands have better docking properties with one or more of the random proteins compared to the SARS-CoV-2 proteins.\nBased on the docking energies of essential oil components with key protein targets of SARS-CoV-2, the individual essential oil components cannot be considered viable chemotherapeutic agents for interaction with the SARS-CoV-2 target proteins. However, essential oils are complex mixtures of compounds and several essential oil components may act synergistically to inhibit the virus. Astani and co-workers have shown, for example, that the antiviral activity (HSV-1) of Eucalyptus oil is much greater than the major component 1,8-cineole, and that tea tree oil has a greater antiviral activity than its components terpinen-4-ol, γ-terpinene, and α-terpinene [52].\nSynergistic effects have also been observed between essential oils and synthetic antiviral agents. Civitelli and co-workers observed an antiviral synergism between Mentha suaveolens essential oil and acyclovir on HSV-1 [64]. Likewise, Melissa officinalis essential oil potentiated the activity of oseltamivir against avian influenza virus H9N2 [115]. Furthermore, essential oils are lipophilic and therefore may also serve to disintegrate viral membranes [116].\nOutside of antiviral activity, there may be some relief of symptoms of COVID-19 provided by essential oils. For example, linalool [117,118], β-caryophyllene [119,120], and 1,8-cineole [121,122] have both anti-inflammatory and antinociceptive activity; menthol [123,124], camphor [125,126], and thymol [127] have antitussive activities.\n\n3. Materials and Methods\n\n3.1. Bibliographic Search Criteria\nThe bibliographic research was performed using the databases Google Scholar, Pubmed, Science Direct, Medline, and Scopus. The keywords applied were “antiviral activity” and “essential oils”, “antiviral activity” and “volatile compounds”, and “essential oils” and “respiratory diseases”.\n\n3.2. Ligand Selection\nThe major components (\u003e5%) of essential oils and pure essential oil components that have been screened against human pathogenic viruses were selected. In the case where enantiomers are known to be natural products, both structures were selected. A total of 171 essential oil components were used in the virtual screening.\n\n3.3. Molecular Docking\nEach ligand structure was prepared using Spartan ’18 v. 1.4.4 (Wavefunction, Inc., Irvine, CA, USA). The lowest-energy conformations of the ligands were determined and used as starting structures in the molecular docking. This is particularly important to include all potential conformations in medium-sized rings where interconversion between conformations may be hindered (e.g., bicyclogermacrene, costunolide, curdione, germacrene D, germacrone, and α-humulene). A total of six protein targets of SARS-CoV-2 from the Protein Data Bank (PDB), represented by a total of 17 structures, were used in the molecular docking, including SARS-CoV-2 main protease (PDB: 5R7Z, 5R80, 5R81, 5R82, 5R83, 5R84, 6LU7, 6M03, and 6Y84), SARS-CoV-2 endoribonuclease (PDB: 6VWW), SARS-CoV-2 ADP ribose phosphatase (PDB: 6W01 and 6W02), SARS-CoV-2 RNA-dependent RNA polymerase (PDB: 6M71), SARS-CoV-2 spike protein binding domain (PDB: 6M0J, 6VX1, 6VW1, and 6M17), and the human angiotensin-converting enzyme (PDB: 6M0J, 6VX1, 6VW1, and 6M17). Molecular docking was carried out using Molegro Virtual Docker v. 6.0.1 (Aarhus, Denmark) as previously reported [128,129]. Briefly, a 15-Å radius sphere centered on the binding sites of each protein structure in order to permit each ligand to search. In the case of the spike protein and human ACE2, the docking sphere was located at the interface between the spike protein and ACE2. In one case, ACE2 was removed and docking was carried out with the spike protein, and in the other case, the spike protein was removed and docking was carried out with ACE2. Standard protonation states of each protein, based on neutral pH, were used, and charges were assigned based on standard templates as part of the Molegro Virtual Docker program. Each protein was used as a rigid model without protein relaxation. Flexible-ligand models were used in the docking optimizations. Different orientations of the ligands were searched and ranked based on their “rerank” energy scores. A minimum of 100 runs for each ligand was carried out. In analyzing the docking scores, we accounted for the recognized bias due to molecular weight [130,131,132] using the scheme: DSnorm = 7.2 × Edock/MW⅓, where DSnorm is the normalized docking score, Edock is the MolDock re-rank score, MW is the molecular weight, and 7.2 is a scaling constant to ensure the average DSnorm values are comparable to those of Edock [128]. The best docking results are summarized in Table 1.\n\n4. Conclusions\nA molecular docking analysis was carried out using 171 essential oil components with the SARS-CoV-2 main protease (SARS-CoV-2 Mpro), SARS-CoV-2 endoribonucleoase (SARS-CoV-2 Nsp15/NendoU), SARS-CoV-2 ADP-ribose-1″-phosphatase (SARS-CoV-2 ADRP), SARS-CoV-2 RNA-dependent RNA polymerase (SARS-CoV-2 RdRp), the binding domain of the SARS-CoV-2 spike protein (SARS-CoV-2 rS), and human angiotensin-converting enzyme (hACE2). The best docking ligands for the SARS-CoV target proteins were (E,E)-α-farnesene, (E)-β-farnesene, and (E,E)-farnesol. The docking energies were relatively weak, however, and are unlikely to interact with the virus targets. However, essential oil components may act synergistically, essential oils may potentiate other antiviral agents, or they may provide some relief of COVID-19 symptoms.\n\nAcknowledgments\nW.N.S. participated in this work as part of the activities of the Aromatic Plant Research Center 237 (APRC, https://aromaticplant.org/).\n\nAuthor Contributions\nConceptualization, J.K.R.d.S., K.G.B., and W.N.S.; methodology, J.K.R.d.S., K.G.B., and W.N.S.; formal analysis, W.N.S.; investigation, J.K.R.d.S., P.L.B.F., K.G.B., and W.N.S.; data curation, W.N.S.; writing—original draft preparation, J.K.R.d.S. and W.N.S.; writing—review and editing, J.K.R.d.S., P.L.B.F., K.G.B., and W.N.S.; project administration, W.N.S.; All authors have read and agreed to the published version of the manuscript.\n\nFunding\nThis research received no external funding.\n\nConflicts of Interest\nThe authors declare no conflict of interest. Abbreviations\nAdeno Adenovirus\nAIV Avian influenza virus\nBaNadD Bacillus anthracis nicotinate mononucleotide adenylytransferase\nBtOBP Bovine odorant binding protein\nCOVID-19 Coronavirus disease 2019\nCox B1 Coxsackie B1 virus\nDENV-1 Dengue virus serotype 1\nDENV-2 Dengue virus serotype 2\nDENV-3 Dengue virus serotype 3\nDENV-4 Dengue virus serotype 4\nDrPLA2 Russell’s viper phospholipase A2\nDSnorm Normalized docking score\nEcAspTA Esherichia coli L-aspartate aminotransferase\nECHO 9 Echovirus 9\nhACE2 Human angiotensin-converting enzyme\nHeLa Human cervical tumor cells\nHEp-2 Human epithelial type 2 cells\nHRSV Human respiratory syncytial virus\nHSV-1 Herpes simplex virus 1\nHSV-2 Herpes simplex virus 2\nIC50 Median inhibitory concentration\nJUNV Junin virus\nMDCK Madin-Darby canine kidney cells\nMTT 3-(4,5-dimethylthiazol-2-yl)-2,5-diphenyltetrazolium bromide\nPCR Polymerase chain reaction\nPDB Protein data bank\nPolio 1 Poliomyelitis virus 1\nRC-37 African green monkey kidney cells\nSARS-CoV-2 2019 severe acute respiratory syndrome coronavirus 2\nTcAChE Torpedo acetylcholinesterase\nVero African green monkey kidney cells\nYFV Yellow fever virus\n\nFigure 1 Lowest-energy docked poses of (E)-β-farnesene and (E,E)-α-farnesene with the SARS-CoV-2 main protease (PDB: 6LU7). (A) Ribbon structure of the enzyme and (E)-β-farnesene. (B) Solid structure of the enzyme showing (E)-β-farnesene in the binding cleft. (C) Amino acid residues in proximity to the docked (E)-β-farnesene. (D) Lowest-energy docked pose of (E,E)-α-farnesene in the enzyme binding site.\nFigure 2 Lowest-energy docked poses of (E,E)-farnesol and (E)-nerolidol with the SARS-CoV-2 main protease (PDB: 6Y84). (A) Ribbon structure of the enzyme and (E,E)-farnesol (magenta) and (E)-nerolidol (orange). (B) Solid structure of the enzyme showing (E,E)-farnesol (magenta) and (E)-nerolidol (orange) in the binding cleft. (C) Important interactions of amino acid residues with (E,E)-farnesol. (D) Important interactions of amino acid residues with (E)-nerolidol. Hydrogen bonds are indicated with blue dashed lines.\nFigure 3 Lowest-energy docked poses of (E,E)-α-farnesene, (E)-β-farnesene, (E,E)-farnesol, and (E)-nerolidol with SARS-CoV-2 endoribonuclease (PDB: 6VWW). (A) Ribbon structure of the enzyme and (E,E)-α-farnesene (green), (E)-β-farnesene (aqua), (E,E)-farnesol (magenta), and (E)-nerolidol (orange). (B) Solid structure of the enzyme showing (E,E)-α-farnesene (green), (E)-β-farnesene (aqua), (E,E)-farnesol (magenta), and (E)-nerolidol (orange) in the binding cleft. (C) Lowest-energy docked pose of (E,E)-α-farnesene in the binding site. (D) Lowest-energy docked pose of (E)-β-farnesene in the binding site. (E) Lowest-energy docked pose of (E,E)-farnesol in the binding site. (F) Lowest-energy docked pose of (E)-nerolidol in the binding site. Hydrogen bonds are indicated with blue dashed lines.\nFigure 4 Lowest-energy docked pose of (E,E)-farnesol with SARS-CoV-2 ADP ribose phosphatase (PDB: 6W02). (A) Ribbon structure of the enzyme and the docked ligand. (B) Solid structure of the enzyme showing (E,E)-farnesol in the binding cleft. (C) Amino acid residues in proximity to the docked (E,E)-farnesol (hydrogen bonds are indicated with blue dashed lines).\nFigure 5 Lowest-energy docked poses of β-sesquiphellandrene, α-zingiberene, phytol, and phytone with SARS-CoV-2 ADP ribose phosphatase (PDB: 6W02). (A) Ribbon structure of the enzyme with β-sesquiphellandrene (brown) and α-zingiberene (yellow). (B) Ribbon structure of the enzyme with phytol (green) and phytone (red).\nFigure 6 Lowest-energy docked ligands with the binding domain of SARS-CoV-2 spike protein and human angiotensin-converting enzyme 2 (ACE2) (PDB: 6M17).\nTable 1 Essential oils showing antiviral activity.\nEssential Oil Major Components Assay IC50 (μg/mL) Reference\nAloysia gratissima (Gillies \u0026 Hook.) Tronc. caryophyllene oxide (15.8%), guaiol (17.4%) a, chrysanthenyl acetate (5.6%), and limonene oxide (5.3%) Plaque reduction assay (Vero cells), HSV-1 65.0 [37]\nAloysia triphylla Royle α-thujone (22.9%), cis−carveol (17.5%), carvone (13.2%), and limonene (12.7%) Plaque reduction assay (Vero cells), HSV-1 \u003e250 [38]\nArtemisia arborescens L. camphor (35.7%), β-thujone (24.0%), and chamazulene (7.7%) Plaque reduction assay (Vero cells), HSV-1 25% inhibition at 100 μg/mL [39]\nArtemisia arborescens L. Artemisia arborescens L. β-thujone (45.0%), camphor (6.8%), and chamazulene (22.7%) c Plaque reduction assay (Vero cells), HSV-1, HSV-2 2.4, 4.1 [40]\nArtemisia douglasiana Besser α-thujone (68.3%) and β-thujone (7.5%) Plaque reduction assay (Vero cells), HSV-1 83 [37]\nArtemisia kermanensis Podlech (syn. Seriphidium kermanense (Podlech) K. Bremer \u0026 Humphries α-thujone (13.8%), camphor (10.2%), and β-thujone (6.2%) Plaque reduction assay (Vero cells), HSV-1 40 [41]\nArtemisia mendozana DC. camphor (22.4%), artemiseole (11.7%), artemisia alcohol (10.8%), and borneol (7.2%) Plaque reduction assay, DENV−2, JUNV and HSV-1 129.3, 178.6, and 153.7 [38]\nArtemisia princeps Pamp. borneol (12.1%), α-thujone (8.7%), τ−cadinol, (6.7%), and 1,8-cineole (6.2%) Plaque reduction assay, murine norovirus−1 64% inhibition at 0.01% [42]\nPlaque reduction assay, feline calicivirus−F9 48% inhibition at 0.1%\nArtemisia vulgaris L. α-thujone (38.1%), β-thujone (10.6%), and 1,8-cineole (8.8%) Virus yield assay (Vero cells), yellow fever virus (YFV) 100 μg/mL (100% inhibition) [43]\nAyapana triplinervis (Vahl) R.M. King \u0026 H. Rob. thymohydroquinone dimethyl ether Plaque reduction assay (A549 cells), Zika virus 38.0 [44]\nBuddleja cordobensis Griseb. caryophyllene oxide (32.1%), β-caryophyllene (16.5%), and α-copaene (8.5%) Plaque reduction assay, DENV−2, JUNV and HSV-1 86.4, 39.0, and 54.1 [38]\nCedrus libani A. Rich. himachalol (22.5%), β-himachalene (21.9%), and α-himachalene (10.5%) Cytopathic effect (CPE) on Vero cells, HSV-1 440 [45]\nCinnamomum zeylanicum Blume (syn. Cinnamomum verum J. Presl) eugenol (75–85%), linalool (1.6−8.5%), (E)−cinnamaldehyde (0.6−1.5%), (E)−cinnamyl acetate (0.7–2.6%), β-caryophyllene (0.5–6.7%), eugenyl acetate (0.1–2.9%), and benzyl benzoate (0.1–8.3%) Influenza type A (H1N1) [46]\nCinnamomum zeylanicum Blume (syn. Cinnamomum verum J. Presl) (E)−cinnamaldehyde (63.9%), eugenol (7.0%), and (E)−cinnamyl acetate (5.1%) c Plaque reduction assay (HeLa cells), HSV-2 82 [47]\nCitrus × bergamia Risso \u0026 Poit. limonene (23–55%), linalool (2–37%), linalyl acetate (12–41%), β-pinene (up to 10%), and γ-terpinene (up to 10%) Influenza virus type A H1N1 100% inhibition at 0.3% [46]\nCitrus limonum Risso limonene (54.6%), γ-terpinene (19.1%), and β-pinene (14.5%) d Plaque reduction assay (Vero cells), HSV-1 2500 [48]\nCitrus reshni Hort ex Tan. (leaf EO) sabinene (40.5%), linalool (23.3%), and terpinen-4-ol (8.3%) Plaque reduction assay, influenza A virus H5N1 19.4% inhibition at 0.1 μL/mL [36]\nCitrus reshni Hort ex Tan. (unripe fruit peel EO) limonene (82.4%) and linalool (7.2%) Plaque reduction assay, influenza A virus H5N1 61.5% inhibition at 1.5 μL/mL [36]\nCitrus reshni Hort ex Tan. (ripe fruit peel EO) limonene (91.6%) Plaque reduction assay, influenza A virus H5N1 50% inhibition at 1.5 μL/mL [36]\nCupressus sempervirens L. α-pinene (51.9%) and δ-3-carene (24.9%) c Plaque reduction assay (Vero cells), HSV-1 6600 [48]\nCymbopogon citratus (DC.) Stapf geranial (40.2%), neral (30.6%), and geraniol (6.7%) c Plaque reduction assay (Vero cells), HSV-1 91 [48]\nCymbopogon flexuosus (Nees) Will. Watson geranial (48–54%) and neral (29–33%) Influenza virus type A (H1N1) [46]\nCynanchum stauntonii (Decne.) Schltr. ex H. Lév. (2E,4E)-decadienal (23.0%), γ-nonalactone (4.2%), 5-pentyl-2(3H)−furanone (3.8%), and 3-isopropyl-1-pentanol (3.5%) Influenza type A (H1N1) 64 [46]\nDysphania ambrosioides (L.) Mosyakin \u0026 Clemants cis-ascaridole (60.7%) and m-cymene (22.2%) Plaque reduction assay, Coxsackie virus B4 21.75 [49]\nEucalyptus astringens (Maiden) Maiden 1,8-cineole (42.0%), α-pinene (22.0%), and trans−pinocarveol (7.0%) Vero cells, Coxsakie virus B3 13.0 [50]\nEucalyptus bicostata Maiden, Blakely \u0026 Simmonds 1,8-cineole (68.0%), globulol (5.4%), and trans−pinocarveol (4.6%) Vero cells, Coxsakie virus B3 13.6 [50]\nEucalyptus caesia Benth. 1,8-cineole (40.2%), p-cymene (14.1%), γ-terpinene (12.4%), α-pinene (7.7%), and terpinen-4-ol (5.6%) Plaque reduction assay (Vero cells), HSV-1 70 [41]\nEucalyptus camaldulensis Dehnh. α-terpinene (26.3%), α-terpineol (9.1%), and camphene (8.5%) e Plaque reduction assay, Rotavirus Wa strain 50% inhibition at 10% EO concentration [51]\nEucalyptus camaldulensis Dehnh. α-terpinene (26.3%), α-terpineol (9.1%), and camphene (8.5%) e Plaque reduction assay, Coxsackie virus B4 53.3% at 10% EO concentration [51]\nEucalyptus camaldulensis Dehnh. α-terpinene (26.3%), α-terpineol (9.1%), and camphene (8.5%) e Plaque reduction assay, HSV-1 90% at 10% EO concentration [51]\nEucalyptus camaldulensis Dehnh. α-terpinene (26.3%), α-terpineol (9.1%), and camphene (8.5%) e Plaque reduction assay, adenovirus type 7 0% at 10% EO concentration [51]\nEucalyptus cinereal F. Muell. ex Benth. 1,8-cineole (70.4%), α-pinene (4.5%), and limonene (3.7%) Vero cells, Coxsakie virus B3 13.0 [50]\nEucalyptus globulus Labill. 1,8-cineole (63.8%) and α-pinene (14.0%) f Plaque reduction assay (Vero cells), HSV-1 1700 [48]\nEucalyptus globulus Labill. 1,8-cineole (63.8%) and α-pinene (14.0%) f Plaque reduction assay (RC-37 cells), HSV-1 55.0 [52]\nEucalyptus lehmannii (Schauer) Benth. 1,8-cineole (59.6%), α-pinene (17.6%), and α-terpineol (8.7%) Vero cells, Coxsakie virus B3 11.5 [50]\nEucalyptus leucoxylon F. Muell. 1,8-cineole (59.2%), α-pinene (7.8%), and α-terpineol (4.3%) Vero cells, Coxsakie virus B3 8.1 [50]\nEucalyptus maidenii F. Muell. 1,8-cineole (57.8%), p-cymene (7.4%), and α-pinene (7.3%) Vero cells, Coxsakie virus B3 14.5 [50]\nEucalyptus odorata Behr cryptone (20.9%), p-cymene (16.7%), phellandral (6.6%), and cuminal (6.6%) Vero cells, Coxsakie virus B3 19.2 [50]\nEucalyptus sideroxylon A. Cunn. ex Woolls 1,8-cineole (69.2%), α-pinene (6.9%), and α-terpineol (5.4%) Vero cells, Coxsakie virus B3 12.3 [50]\nEupatorium patens D. Don ex Hook. \u0026 Arn. germacrene D (36.2%), β-caryophyllene (14.1%), and bicyclogermacrene (7.0%) Plaque reduction assay (Vero cells), HSV-1 125 [37]\nFortunella margarita (Lour.) Swingle (leaf EO) α-terpineol (55.5%), carvone (5.7%), carveol (5.5%), γ-muurolene (5.5%), and citronellal (5.0%) MTT assay, reasserted avian influenza A virus, H5N1 6.77 [53]\nFortunella margarita (Lour.) Swingle (fruit EO) β-eudesmol (28.3%), α-muurolene (10.3%), β-gurjunene (10.0%), γ-eudesmol (8.4%), and γ-muurolene (6.6%) MTT assay, reasserted avian influenza A virus, H5N1 38.89 [53]\nGaillardia megapotamica (Spreng.) Baker β-pinene (24.2%), (Z)-β-ocimene (16.5%), α-pinene (7.7%), limonene (7.5%), and β-caryophyllene (6.7%) Plaque reduction assay, DENV−2, JUNV and HSV-1 140.6, 49.8, and 99.1 [38]\nHeterothalamus alienus (Spreng.) Kuntze β-pinene (35.5%), spathulenol (10.7%), and germacrene D (6.8%) Plaque reduction assay DENV−2, JUNV and HSV-1 122.3, 44.2 and 148.4 [38]\nHeterotheca latifolia Buckley borneol (40.0%), camphor (24.3%), and limonene (5.1%) Plaque reduction assay (Vero cells), HSV-1 \u003e150 [37]\nHouttuynia cordata Thunb. decanal (3.4−8.9%), decanol (up to 7.0%), 2−undecanone (23.0−36.1%), decanoic acid (1.4−6.3%), dodecanal (up to 7.3%), and 2−tridecanone (2.6−5.6%) Influenza type A (H1N1) 48 [54]\nHyptis mutabilis (Rich.) Briq. fenchone (17.1%), 1,8-cineole (12.6%), β-caryophyllene (10.9%), bicyclogermacrene (8.7%), and germacrene D (6.2%) Plaque reduction assay (Vero cells), HSV-2 (Human Herpesvirus type 1) 79.01 [55]\nHyptis mutabilis (Rich.) Briq. germacrene D (15.1%), β-caryophyllene (13.3%), curzerene (13.3%), and bicyclogermacrene (13.2%) Plaque reduction assay (Vero cells) \u003e150 [37]\nHyssopus officinalis L. cis−pinocamphone (40.1%), trans−pinocamphone (13.3%), β-pinene (10.7%), and β-phellandrene (5.3%) c Plaque reduction assay (RC-37 cells), HSV-1 1 [56]\nHyssopus officinalis L. cis−pinocamphone (40.1%), trans−pinocamphone (13.3%), β-pinene (10.7%), and β-phellandrene (5.3%) c Plaque reduction assay (RC-37 cells), HSV-2 6 [57]\nIllicium verum Hook. f. (E)−anethole (90.5%) c Plaque reduction assay (RC-37 cells), HSV-1 40 [58]\nIllicium verum Hook. f. (E)−anethole (90.5%) c Plaque reduction assay (RC-37 cells), HSV-1 1 [59]\nIllicium verum Hook. f. (E)−anethole (90.5%) c Plaque reduction assay (RC-37 cells), HSV-2 30 [57]\nJungia polita Griseb. caryophyllene oxide (9.2%) and β-caryophyllene (8.1%) Plaque reduction assay DENV−2, JUNV and HSV-1 39.8, 134.2 and 136.4 [38]\nJuniperus communis L. α-pinene (46.7%), myrcene (15.0%), sabinene (13.2%), and limonene (7.0%) c Plaque reduction assay (Vero cells), HSV-1 \u003e10000 [48]\nLavandula angustifolia Mill. linalyl acetate (37.0−43.6%), linalool (19.7−39.1%), geraniol (up to 9.3%), β-caryophyllene (up to 5.1%), terpinene−4−ol (up to 14.9%), lavandulol (up to 1.5%), lavandulyl acetate (up to 5.5%), 1,8-cineole (up to 4.1%), and borneol (up to 6.4%) 85% in vitro inhibition of influenza type A (H1N1) [46]\nLavandula latifolia Medik. linalool (31.9%), 1,8-cineole (18.8%), and borneol (10.1%) g Plaque reduction assay (Vero cells), HSV-1 2200 [48]\nLepechinia salviifolia (Kunth) Epling camphor (10.3%), limonene (9.7%), p−mentha−1(7),8−diene (7.4%), α-pinene (6.9%), and γ-terpinene (6.7%) Plaque reduction assay (Vero cells), HSV-1, HSV-2 68.8, 81.9 [55]\nLepechinia vulcanicola J.R.I. Wood limonene (18.9%), germacrene D (10.4%), 1−octen−3−ol (8.8%), β-caryophyllene (8.7%), and α-pinene (8.2%) Plaque reduction assay (Vero cells), HSV-1, HSV-2 112, 68.9 [55]\nLeptospermum scoparium J.R. Forst. \u0026 G. Forst. calamene (16.0%), leptospermone (14.5%), δ−cadinene (6.1%), flavesone (4.5%), viridiflorene (4.4%), and isoleptospermone (3.9%) Plaque reduction assay (RC-37 cells), HSV-1, HSV-2 0.96, 0.58 [60]\nLippia alba (Mill.) N.E. Br. ex Britton \u0026 P. Wilson carvone (51.0%), Limonene (33%), and bicyclosesquiphellandrene (7.0%) Virus yield assay (Vero cells), yellow fever virus (YFV) 100 μg/mL (100% inhibition) [43]\nLippia alba (Mill.) N.E. Br. ex Britton \u0026 P. Wilson carvone (39.7%), limonene (30.6%), and bicyclosesquiphellandrene (8.9%) Plaque reduction assay (Vero cells), DENV−1, DENV−2, DENV−3, DENV−4, YFV 17 DD 10.1, 0.4, 32.6, 21.1, 4.9 [61]\nLippia alba (Mill.) N.E. Br. ex Britton \u0026 P. Wilson carvone (39.7%), limonene (30.6%), and bicyclosesquiphellandrene (8.9%) Plaque reduction assay (Vero cells), Yellow fever (YFV) 4.3 [62]\nLippia citriodora Kunth (syn. Aloysia citriodora Palau) geranial (18.9%), neral (15.6%), limonene (10.7%), and 1,8-cineole (5.0) Plaque reduction assay (Vero cells), DENV−1, DENV−2, DENV−3, DENV−4, YFV 17 DD 1.9, 2.9, 2.6, 33.7, 5.7 [61]\nLippia citriodora Kunth (syn. Aloysia citriodora Palau) geranial (18.9%), neral (15.6%), limonene (10.7%), and 1,8-cineole (5.0) Plaque reduction assay (Vero cells), Yellow fever (YFV) 19.4 [62]\nLippia graveolens Kunth carvacrol (56.8%), o−cymene (32.1%), and γ-terpinene (3.7%) h MTT assay (Mardin−Darby bovine kidney cells), HSV-1, ACVR−HSV-1 (acyclovir−resistant HSV-1), HRSV (human respiratory syncytial virus) 99.6, 55.9, 68.0 [63]\nLippia junelliana (Moldenke) Tronc. piperitenone oxide (= rotundifolone) (36.5%), limonene (23.1%), camphor (7.9%), and spathulenol (6.5%) Plaque reduction assay (Vero cells), HSV-1 \u003e150 [37]\nLippia origanoides carvacrol (44.0%), thymol (15.0%), and γ-terpinene (10.0%) Virus yield assay (Vero cells), yellow fever virus (YFV) 11.1 μg/mL (100% inhibition) [43]\nLippia turbinata Griseb. limonene (60.6%), piperitenone oxide (17.4%), and β-caryophyllene (6.4%) Plaque reduction assay (Vero cells), HSV-1 \u003e 150 [37]\nMatricaria recutita L. α-bisabolol oxide A (13.4–55.9%), α-bisabolol oxide B (8.4–25.1%), bisabolone oxide A (2.9–11.4%), cis−bicycloether (= (Z)−spiroether) (3.6–17.7%), and (E)-β-farnesene (1.9–10.4%) i Plaque reduction assay (RC-37 cells), HSV-1 0.3 [58]\nMatricaria recutita L. α-bisabolol oxide A (13.4–55.9%), α-bisabolol oxide B (8.4–25.1%), bisabolone oxide A (2.9−11.4%), cis−bicycloether (= (Z)−spiroether) (3.6–17.7%), and (E)-β-farnesene (1.9–10.4%) i Plaque reduction assay (RC-37 cells), HSV-2 1.5 [57]\nMelaleuca alternifolia Cheel terpinen-4-ol (36.71%), γ-terpinene (22.20%), and α-terpinene (10.10%) Plaque reduction assay, influenza A⁄PR ⁄ 8 virus subtype H1N1 60 [31]\nMelaleuca alternifolia Cheel terpinen-4-ol (30–48%), γ-terpinene (10–28%), α-terpinene (5–13%), 1,8-cineole (up to 15%), terpinolene (1.5−5%), p-cymene (0.5–12%), α-pinene (1–6%), and α-terpineol (1.5–8%) 100% inhibition of influenza type A (H1N1) virus at 0.01%; type A (H11N9) virus to tea tree oil vapor caused 100% inhibition [46]\nMelaleuca alternifolia Cheel terpinen-4-ol (47.5%), γ-terpinene (20.2%), and α-terpinene (8.6%) c Plaque reduction assay (Vero cells), HSV-1 2700 [48]\nMelaleuca alternifolia Cheel terpinen-4-ol (47.5%), γ-terpinene (20.2%), and α-terpinene (8.6%) c Plaque reduction assay (Vero cells), HSV-1 13.2 [64]\nMelaleuca alternifolia Cheel terpinen-4-ol (47.5%), γ-terpinene (20.2%), and α-terpinene (8.6%) c Plaque reduction assay (RC-37 cells), HSV-1 2 [52]\nMelaleuca alternifolia Cheel terpinen-4-ol (47.5%), γ-terpinene (20.2%), and α-terpinene (8.6%) c Plaque reduction assay (HeLa cells), HSV-2 2700 [47]\nMelaleuca alternifolia Cheel terpinen-4-ol (47.5%), γ-terpinene (20.2%), and α-terpinene (8.6%) c Plaque reduction assay (Vero cells), HSV-1 significant plaque reduction at 10 and 5% v/v [65]\nMelaleuca armillaris (Sol. ex Gaertn.) Sm. 1,8-cineole (33.9%), terpinen-4-ol (18.8%), and γ-terpinene (10.4%) Plaque reduction assay (Vero cells), HSV-1 99% plaque reduction (concentration not given) [66]\nMelaleuca ericifolia Sm. methyl eugenol (96.84%) Plaque reduction assay (Vero cells), HSV-1 91.5% plaque reduction (concentration not given) [66]\nMelaleuca leucadendra (L.) L. 1,8-cineole (64.3%), α-terpineol (11.0%), and valencene (3.91%) Plaque reduction assay (Vero cells), HSV-1 92% plaque reduction (concentration not given) [66]\nMelissa officinalis L. neral (17−32%), geranial (23–43%), linalool (up to 9.0%), citronellal (0.7–20.3%), geraniol (up to 23.2%), β-caryophyllene (up to 11.3%), and caryophyllene oxide (0.4−31.7%) influenza A virus (H9N2) Significant reduction at 5 μg/mL [46]\nMelissa officinalis L. β-cubebene (15.4%), β-caryophyllene (14.2%), α-cadinol (7.2%), geranial (6.6%), and neral (5.8%) Plaque reduction assay (HEp−2 cells), HSV-2 21 [67]\nMelissa officinalis L. geranial (20.1%), β-caryophyllene (17.3%), and neral (13.6%) Plaque reduction assay (RC-37 cells), HSV-1, HSV-2 4, 0.8 [68]\nMentha × piperita L. menthol (42.8%), menthone (14.6%), and isomenthone (5.9%) Plaque reduction assay (RC-37 cells), HSV-1, HSV-2 20, 8 [69]\nMentha × piperita L. menthol (43.8%), menthone (19.7%), menthyl acetate (6.5%), and 1,8-cineole (5.0%) c Plaque reduction assay (Vero cells), HSV-1 2200 [48]\nMentha suaveolens Ehrh. limonene (7.4%), isopulegol (12.0%), and piperitenone oxide (41.8%) Plaque reduction assay, cytopathogenic murine norovirus 0.87 [70]\nMentha suaveolens Ehrh. piperitenone oxide (86.9%) Plaque reduction assay (Vero cells), HSV-1 5.1 [64]\nMinthostachys mollis Griseb. cis−piperitone epoxide (29.9%), piperitenone oxide (25.6%), menthone (7.4%), germacrene D (5.8%), and pulegone (5.5%) Plaque reduction assay (Vero cells), HSV-1, HSV-2 70.7, 68.0 [55]\nOcimum basilicum var. album (L.) Benth. linalool (53.8%) and eugenol (12.6%) j Plaque reduction assay (Vero cells), HSV-1 \u003e10000 [48]\nOcimum campechianum Mill. methyl eugenol (53.9%), β-caryophyllene (13.0%), α-bulnesene (5.4%), germacrene D (3.4%), and α-humulene (3.3%) Plaque reduction assay (Vero cells), HSV-2 74.33 [55]\nOriganum elongatum Emb. (leaf EO) p-cymene (16.2%), γ-terpinene (13.5%), thymol (14.2%), and carvacrol (19.2%) Plaque reduction assay, cytopathogenic murine norovirus 0.37 [70]\nOriganum elongatum Emb. (inflorescence EO) p-cymene (16.1%), γ-terpinene (7.3%), and carvacrol (40.1%), Plaque reduction assay, cytopathogenic murine norovirus 0.75 [70]\nOriganum majorana L. terpinen-4-ol (28.9%), γ-terpinene (14.9%), trans−sabinene hydrate (9.5%), α-terpinene (8.7%), and sabinene (7.2%) c Plaque reduction assay (Vero cells), HSV-1 2800 [48]\nOriganum majorana L. terpinen-4-ol (28.9%), γ-terpinene (14.9%), trans−sabinene hydrate (9.5%), α-terpinene (8.7%), and sabinene (7.2%) c Plaque reduction assay (HeLa cells), HSV-2 520 [47]\nOriganum vulgare L. trans−sabinene hydrate (21.0%), thymol (11.0%), and carvacrol methyl ether (11.0%) Virus yield assay (Vero cells), yellow fever virus (YFV) 100 μg/mL (100% inhibition) [43]\nOsmunda regalis L. hexahydrofarnesyl acetone ( = phytone) (11.8%), 2,4−di−t−butylphenol (6.8%), phytol (6.5%), hexadecene (4.1%), and octadecene (4.4%) Plaque reduction assay, Coxsackie virus B4 type 2 2.24 [71]\nPectis odorata Griseb. limonene (50.2%), neral (27.2%), and geranial (23.6%) Plaque reduction assay DENV−2, JUNV and HSV-1 39.6, 36.6, and 71.5 [38]\nPelargonium graveolens L’Hér. ex Aiton citronellol (21.9–37.5%), citronellyl formate (9.8–20.6%), geraniol (6.0–16.5%), geranyl formate (1.5–6.5%), menthone (up to 13%), isomenthone (up to 9.9%), and linalool (0.8−14.9%) influenza type A (H1N1) 95% inhibition at 0.3% [46]\nPinus mugo Turra δ-3-carene (23.9%), α-pinene (17.9%), β-pinene (7.8%), and β-phellandrene (7.2%) k Plaque reduction assay (RC-37 cells), HSV-1 7 [58]\nRavensara aromatica Sonn. (syn. Cryptocarya agathophylla van der Werff) 1,8-cineole (52.6%), α-terpineol (12.4%), and sabinene (11.0%) l Plaque reduction assay (Vero cells), HSV-1 2800 [48]\nRosmarinus officinalis L. α-pinene (23.9%), verbenone (15.4%), camphor (11.0%), camphene (8.7%), p-cymene (7.5%), and 3−octanone (5.6%) Plaque reduction assay (Vero cells), HSV-1 60 [41]\nRosmarinus officinalis L. 1,8-cineole (45.9%), α-pinene (12.0%), camphor (10.9%), and β-pinene (6.3%) b Plaque reduction assay (Vero cells), HSV-1 2700 [48]\nSalvia fruticosa Mill. 1,8-cineole (47.5%), camphor (9.0%), β-thujone (7.6%), and α-thujone (4.3%) Plaque reduction assay (Vero cells), HSV-1 and HSV-2 1300 [72]\nSantalum album L. (Z)−α-santalol (45.2%), (Z)-β-santalol (25.4%), and (Z)−trans−α-bergamotol (7.8%) c Plaque reduction assay (Vero cells), HSV-1, HSV-2 22.7, 45.3 [73]\nSantalum album L. (Z)−α-santalol (45.2%), (Z)-β-santalol (25.4%), and (Z)−trans−α-bergamotol (7.8%) c Plaque reduction assay (RC-37 cells), HSV-1 2 [56]\nSantalum album L. (Z)−α-santalol (45.2%), (Z)-β-santalol (25.4%), and (Z)−trans−α-bergamotol (7.8%) c Plaque reduction assay (RC-37 cells), HSV-2 5 [57]\nSantolina insularis (Gennari ex Fiori) Arrigoni artemisia ketone (21.2%), allo−aromadendrene (12.7%), 1,8-cineole (9.0%), and camphene (8.5%) m Plaque reduction assay (Vero cells), HSV-1 and HSV-2 0.88, 0.7 [74]\nSatureja hortensis L. carvacrol (32.4%), γ-terpinene (32.0%), thymol (10.0%), and p-cymene (6.6%) Plaque reduction assay (Vero cells), HSV-1 80 [41]\nTessaria absinthioides (Hook. \u0026 Arn.) DC. caryophyllene oxide (12.2%), (E)-β-damascenone, γ-eudesmol (8.5%), α-gurjunene (5.8%), and terpinen-4-ol (5.4%) Plaque reduction assay (Vero cells), HSV-1 105 [37]\nThymus capitatus (L.) Hoffmanns. \u0026 Link (unripe fruit EO) carvacrol (68.6%), p-cymene (4.8%), γ-terpinene (3.0%), and β-caryophyllene (2.9%) Plaque reduction assay, cytopathogenic murine norovirus 0.49 [70]\nThymus capitatus (L.) Hoffmanns. \u0026 Link (ripe fruit EO) carvacrol (58.8%), p-cymene (5.6%), γ-terpinene (2.8%), and β-caryophyllene (2.6%) Plaque reduction assay, cytopathogenic murine norovirus 0.50 [70]\nThymus vulgaris L. thymol (31–50%), p-cymene (0.1–26.6%), and γ-terpinene (up to 22.8%) 100% inhibition of type A (H1N1) virus at 0.3% concentration [46]\nThymus vulgaris L. thymol (43.9%), carvacrol (14.4%), p-cymene (10.5%), β-caryophyllene (7.0%), and γ-terpinene (5.1%) c Plaque reduction assay (RC-37 cells), HSV-1 10 [56]\nThymus vulgaris L. thymol (43.9%), carvacrol (14.4%), p-cymene (10.5%), β-caryophyllene (7.0%), and γ-terpinene (5.1%) c Plaque reduction assay (RC-37 cells), HSV-1 11 [52]\nThymus vulgaris L. thymol (43.9%), carvacrol (14.4%), p-cymene (10.5%), β-caryophyllene (7.0%), and γ-terpinene (5.1%) c Plaque reduction assay (RC-37 cells), HSV-2 7 [57]\nThymus willdenowii Boiss. 1,8-cineole (34.62%), camphor (18.55%), α-pinene (9.46%), and camphene (5.38%) Plaque reduction assay, Coxsackie virus Inactive [75]\nTrachyspermum ammi (L.) Sprague thymol (35–60%), α-pinene, p-cymene, and limonene Plaque reduction assay, Japanese encephalitis virus 80% reduction at 500 μg/mL [76]\nZataria multiflora Boiss. thymol (47.3%), carvacrol (21.9%), p-cymene (8.6%), γ-terpinene (4.2%), and β-caryophyllene (3.0%) Real time PCR (H9N2 subtype of AIV) Reduced viral replication in trachea of broiler chickens [77]\nZataria multiflora Boiss. thymol (33.1%), carvacrol (25.9%), and p-cymene (11.3%) Plaque reduction assay (Vero cells), HSV-1 30 [41]\nZingiber officinale Roscoe α-zingiberene (32.1%), ar−curcumene (15.2%), β-sesquiphellandrene (10.9%), α-farnesene (7.2%), and α-phellandrene (4.4%) Plaque reduction assay, Caprine alphaherpesvirus type I not determined [78]\nZingiber officinale Roscoe α-zingiberene (26.4%), camphene (12.6%), β-sesquiphellandrene (9.2%), ar−curcumene (6.5%), β-phellandrene (6.2%), and β-bisabolene (5.1%) c Plaque reduction assay (RC-37 cells), HSV-1 2 [56]\nZingiber officinale Roscoe α-zingiberene (26.4%), camphene (12.6%), β-sesquiphellandrene (9.2%), ar−curcumene (6.5%), β-phellandrene (6.2%), and β-bisabolene (5.1%) c Plaque reduction assay (RC-37 cells), HSV-2 1 [57]\na Reported as cadinol, but see [79,80]. b Essential oil composition not reported; essential oil composition obtained from [81]. c Essential oil composition not reported; essential oil composition of commercial (dōTERRA International, Pleasant Grove, Utah, USA). d Essential oil composition not reported; essential oil composition obtained from [82]. e Essential oil composition not reported; essential oil composition obtained from [83]. f Essential oil composition not reported; essential oil composition obtained from [84]. g Essential oil composition not reported; essential oil composition obtained from [85]. h Essential oil composition not reported; essential oil composition obtained from [86]. i Essential oil composition not reported; essential oil composition obtained from [87]. j Essential oil composition not reported; essential oil composition obtained from [88]. k Essential oil composition not reported; essential oil composition obtained from [89]. l Essential oil composition not reported; essential oil composition obtained from [90]. m Essential oil composition not reported; essential oil composition obtained from [91].\nTable 2 Antiviral activities of essential oil components.\nEssential Oil Component Assay IC50 (μg/mL) Reference\n(E)−Anethole Plaque reduction assay (RC-37 cells), HSV-1 20 [59]\nCamphor Plaque reduction assay (Vero cells), HSV-1 2600 [72]\nCarvacrol MTT assay (Mardin−Darby bovine kidney (MDBK) cells, HSV-1 48.6 [63]\nβ-Caryophyllene Plaque reduction assay (RC-37 cells), HSV-1 0.25 [59]\nCaryophyllene oxide Plaque reduction assay (RC-37 cells), HSV-1 0.7 [59]\n1,8-Cineole Plaque reduction assay (Vero cells), HSV-1 1800 [72]\n1,8-Cineole Plaque reduction assay (RC-37 cells), HSV-1 1200 [52]\n(E)-Cinnamaldehyde Influenza type A (H1N1) virus 70% at a concentration of 0.53% after 3 h [95]\n(E)-Cinnamaldehyde H1N1 in-vivo by inhalation in a mouse model 89% inhibition [95]\nCitral (Geranial + Neral) Yellow fever (YFV), Vero cells 17.6 [62]\nCitral (Geranial + Neral) Plaque reduction assay (RC-37 cells), HSV-1 3.50 [52]\np-Cymene Influenza, HSV-1, HSV-2, ECHO 9, Cox B1, Polio 1, Adeno 6 \u003e500 [31]\np-Cymene Plaque reduction assay (RC-37 cells), HSV-1 16 [52]\np-Cymene Influenza type A (H1N1) virus Inactive [25]\nDodecanal Influenza type A (H1N1) virus 51 [54]\nβ-Eudesmol Plaque reduction assay (Vero cells), HSV-1 6 [59]\nEugenol Plaque reduction assay (RC-37 cells), HSV-1 35 [59]\nEugenol Plaque reduction assay (RC-37 cells), HSV-1 25.6 [96]\nFarnesol Plaque reduction assay (RC-37 cells), HSV-1 3.5 [59]\nGermacrone Influenza type A (H1N1) virus 1.22–1.55 [97]\nGermacrone Influenza type A (H3N2) virus 0.34 [97]\nGermacrone Influenza type B virus 1.38 [97]\nIsoborneol Plaque reduction assay (Vero cells), HSV-1 \u003c1000 [98]\nNerolidol (natural) Plaque reduction assay (RC-37 cells), HSV-1 4.2 [99]\nNerolidol (synthetic) Plaque reduction assay (RC-37 cells), HSV-1 1.5 [99]\nOctanal Influenza type A (H1N1) virus 15 [54]\nPatchouli alcohol Influenza type A (H1N1) 89% inhibition at 10 μg/mL [100]\nPatchouli alcohol Influenza type A (H2N2) 0.89 [101]\nPatchouli alcohol Influenza type A (H2N2), in-vivo test using a mouse model 70% survival rate at a dose of 5 mg/(kg day) [101]\nα-Pinene Plaque reduction assay (RC-37 cells), HSV-1 4.5 [52]\nPiperitenone oxide Plaque reduction assay (Vero cells) 1.4 [64]\nα-Terpinene Influenza type A (H1N1) virus Inactive [25]\nα-Terpinene Influenza, HSV-1, HSV-2, ECHO 9, Cox B1, Polio 1, Adeno 4 \u003e12 [31]\nα-Terpinene Plaque reduction assay (RC-37 cells), HSV-1 8.5 [52]\nγ-Terpinene Plaque reduction assay (RC-37 cells), HSV-1 7 [52]\nγ-Terpinene Influenza, HSV-1, HSV-2, ECHO 9, Cox B1, Polio 1, Adeno 5 \u003e120 [31]\nγ-Terpinene influenza type A (H1N1) virus inactive [25]\nTerpinen-4-ol Influenza, HSV-1, HSV-2, ECHO 9, Cox B1, Polio 1, Adeno 2 25 (influenza)\u003e50 (others) [31]\nTerpinen-4-ol Plaque reduction assay (Vero cells), HSV-1 60 [52]\nα-Terpineol Plaque reduction assay (RC-37 cells), HSV-1 22 [52]\nTerpinolene Influenza, HSV-1, HSV-2, ECHO 9, Cox B1, Polio 1, Adeno 3 12 (influenza)\u003e12 (others) [31]\nThujones (α \u0026 β) Plaque reduction assay (RC-37 cells), HSV-1 400 [72]\nThymol Influenza type A (H1N1) virus Active [25]\nThymol Plaque reduction assay (RC-37 cells), HSV-1 30 [52]\n2-Undecanone influenza type A (H1N1) virus 62 [54]\nTable 3 Docking scores, normalized for molecular weight (DSnorm, kJ/mol), of essential oil components with severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) molecular targets.\nCompound MainProtease Endoribo-Nuclease ADP RibosePhosphatase RNA-DependentRNA Polymerase Spike ProteinBinding Domain Angiotensin-Converting Enzyme a\n(E)-Anethole −84.9 −83.0 −97.5 −74.0 −65.2 −83.8\nallo-Aromadendrene −86.6 −86.9 −95.8 −74.9 −66.1 −85.3\nArtemiseole −89.2 −83.4 −96.6 −73.0 −67.8 −78.0\n(R)-Artemisia alcohol −84.3 −78.3 −88.2 −66.8 −61.1 −74.7\n(S)-Artemisia alcohol −86.1 −85.4 −98.5 −69.5 −67.1 −77.4\nArtemisia ketone −91.0 −85.7 −97.9 −71.9 −66.9 −77.3\nAscaridole −74.8 −68.2 −86.0 −65.2 −62.6 −64.4\nBenzyl benzoate −104.9 −96.5 −110.3 −82.5 −74.9 −96.4\n(Z)-trans-α-Bergamotol −98.0 −91.2 −105.9 −71.9 −63.6 −83.6\nBicyclogermacrene −85.9 −88.0 −92.5 −75.6 −68.2 −86.1\nBicyclosesquiphellandrene −79.4 −89.6 −86.0 −61.8 −62.5 −78.2\nα-Bisabolol oxide A −88.5 −87.6 −89.1 −71.5 −63.5 −89.7\nα-Bisabolol oxide B −96.6 −92.2 −101.0 −79.7 −75.2 −95.6\nBisabolone oxide A −93.7 −87.9 −98.2 −73.3 −71.0 −78.7\n(+)-Borneol −77.4 −91.8 −100.1 −74.1 −70.9 −73.3\n(−)-Borneol −71.4 −71.5 −78.4 −56.7 −50.1 −73.7\n(+)-iso-Borneol −75.6 −75.3 −75.9 −60.8 −53.2 −71.8\n(−)-iso-Borneol −73.8 −69.2 −75.6 −54.8 −49.3 −72.4\nα-Bulnesene −95.2 −72.4 −78.4 −57.0 −57.8 −101.7\nδ-Cadinene −91.6 −90.2 −112.6 −75.2 −60.0 −93.4\nτ-Cadinol −92.3 −82.8 −82.5 −69.9 −69.8 −87.8\n(R)-Calamene −92.3 −83.5 −97.4 −69.0 −65.6 −87.3\n(S)-Calamene −88.4 −86.8 −95.9 −70.2 −64.7 −87.5\n(+)-Camphene −85.6 −78.9 −83.2 −64.4 −57.9 −72.2\n(−)-Camphene −77.2 −74.1 −87.1 −66.0 −59.8 −67.1\n(+)-Camphor −75.2 −73.1 −77.9 −63.9 −53.8 −69.4\n(−)-Camphor −72.5 −70.0 −75.6 −64.3 −52.8 −70.8\n(+)-δ-3-Carene −87.9 −78.6 −87.0 −65.0 −72.4 −75.8\n(−)-δ-3-Carene −83.9 −88.0 −90.4 −66.8 −67.3 −73.4\nCarvacrol −84.5 −86.6 −94.8 −74.1 −71.0 −81.2\nCarvacrol methyl ether −85.5 −82.5 −103.1 −74.6 −65.8 −83.7\n(+)-cis−Carveol −87.0 −81.8 −97.7 −76.5 −69.7 −80.4\n(−)-cis−Carveol −85.6 −85.0 −95.6 −76.8 −74.3 −81.2\n(R)-Carvone −87.7 −82.4 −98.2 −74.7 −69.2 −83.4\n(S)-Carvone −86.2 −83.2 −98.9 −73.2 −66.3 −82.2\n(E)-Caryophyllene −81.2 −82.2 −93.9 −73.4 −59.2 −75.1\nCaryophyllene oxide −80.6 −86.7 −97.0 −74.1 −66.5 −83.3\nCedrol −82.3 −84.4 −80.1 −69.7 −58.3 −69.9\nepi-Cedrol −76.4 −88.4 −92.2 −68.5 −55.5 −75.9\nChamazulene −97.6 −96.4 −110.9 −76.9 −73.7 −95.6\n(−)-cis-Chrystanthyl acetate −83.2 −77.5 −87.1 −71.5 −60.2 −80.9\n(−)-trans−Chrysanthenyl acetate −77.0 −81.4 −85.3 −65.9 −68.9 −72.4\n1,8-Cineole −72.7 −67.6 −71.5 −58.1 −58.6 −61.0\n(E)-Cinnamaldehyde −93.1 −85.8 −100.0 −76.4 −73.1 −81.0\n(E)-Cinnamyl acetate −99.4 −88.0 −108.9 −76.9 −80.6 −89.5\n(R)-Citronellal −99.9 −91.6 −105.0 −75.1 −73.3 −88.0\n(S)-Citronellal −98.3 −88.9 −107.4 −72.1 −71.4 −86.2\n(R)-Citronellol −99.9 −90.2 −104.9 −75.7 −72.3 −84.9\n(S)-Citronellol −99.2 −92.2 −107.6 −74.2 −77.4 −85.1\n(R)-Citronellyl formate −105.5 −92.6 −109.9 −72.8 −76.2 −90.5\n(S)-Citronellyl formate −101.5 −96.4 −114.7 −81.9 −78.3 −91.0\nα-Copaene −84.1 −78.9 −85.9 −60.2 −59.6 −77.1\nCostunolide −94.5 −99.2 −110.2 −78.2 −74.9 −92.6\n(R)-Cryptone −86.6 −82.4 −93.5 −68.2 −70.4 −74.8\n(S)-Cryptone −81.5 −82.9 −94.9 −69.8 −70.6 −76.6\nβ-Cubebene −90.8 −92.0 −86.7 −76.0 −71.2 −89.8\nCuminaldehyde −86.2 −80.5 −103.3 −74.9 −67.5 −81.7\nar-Curcumene −105.3 −94.0 −108.6 −82.8 −75.8 −96.4\nCurcumol −83.0 −93.4 −91.2 −73.5 −69.6 −86.0\nCurdione −86.2 −98.1 −99.0 −77.3 −71.7 −92.0\nCurzerene −91.5 −86.0 −104.2 −76.8 −67.6 −90.5\nm-Cymene −83.6 −81.3 −92.8 −72.0 −67.6 −79.0\no-Cymene −83.2 −78.3 −87.7 −63.9 −63.3 −72.9\np-Cymene −79.7 −78.7 −91.0 −70.3 −63.9 −75.4\n(E)-β-Damascenone −85.2 −87.6 −110.2 −73.8 −73.8 −84.8\n(2E,4E)-Decadienal −105.7 −97.7 −112.5 −81.8 −78.7 −90.0\nDodecanal −102.8 −93.9 −101.9 −77.9 −73.3 −94.9\nEremanthin −97.7 −97.7 −98.0 −83.7 −81.3 −100.9\nβ-Eudesmol −97.6 −87.4 −106.5 −75.8 −64.5 −74.7\nγ-Eudesmol −93.6 −89.9 −94.7 −69.4 −66.1 −84.3\nEugenol −93.2 −91.7 −105.2 −80.0 −79.1 −88.4\nEugenol methyl ether −88.5 −85.3 −111.1 −71.7 −68.6 −89.3\nEugenyl acetate −96.3 −89.3 −115.1 −75.6 −70.6 −94.9\n(E,E)-α-Farnesene −115.0 −107.5 −112.8 −86.8 −85.3 −100.3\n(E)-β-Farnesene −115.4 −105.0 −116.3 −87.1 −82.9 −100.7\n(E,E)-Farnesol −112.4 −104.6 −121.4 −89.6 −80.8 −100.9\n(+)-Fenchone −80.0 −80.9 −87.1 −66.1 −60.8 −66.9\n(-)-Fenchone −83.3 −67.5 −86.2 −66.5 −60.9 −68.8\nFlavesone −82.3 −84.0 −95.7 −68.9 −64.4 −78.9\nGeranial −101.7 −90.8 −113.0 −76.1 −74.5 −92.0\nGeraniol −103.5 −98.5 −110.2 −77.4 −76.4 −93.8\nGeranyl formate −105.9 −93.9 −111.4 −80.8 −80.3 −96.2\nGermacrene D −92.1 −96.7 −110.5 −77.1 −73.0 −87.3\nGermacrone −85.1 −97.1 −94.9 −71.6 −67.1 −80.9\nGuiaol −94.1 −92.5 −113.4 −79.2 −79.4 −91.9\nα-Gurjunene −89.9 −83.2 −81.3 −71.5 −61.3 −79.8\nβ-Gurjunene −77.4 −64.1 −81.1 −64.1 −58.0 −75.1\nα-Himachalene −80.4 −89.7 −86.5 −63.7 −67.9 −74.3\nβ-Himachalene −85.5 −81.3 −88.6 −68.1 −62.9 −77.2\nHimachalol −77.2 −88.3 −100.8 −63.6 −63.7 −75.6\nα-Humulene −88.9 −90.9 −89.1 −74.9 −70.6 −86.7\nLeptospermone −85.5 −83.2 −92.9 −71.2 −64.1 −80.0\niso-Leptospermone −86.1 −82.7 −93.7 −69.1 −62.6 −83.5\n(R)-Limonene −82.2 −76.2 −92.0 −72.6 −67.3 −79.0\n(S)-Limonene −82.2 −73.8 −92.2 −72.4 −66.1 −77.5\n(R,S,R)-Limonene oxide −86.3 −77.7 −100.8 −76.7 −68.1 −85.1\n(S,R,R)-Limonene oxide −83.5 −87.4 −89.4 −66.7 −63.4 −76.4\n(S,R,S)-Limonene oxide −84.7 −80.7 −95.8 −74.9 −66.7 −83.8\n(R)-Linalool −96.0 −89.3 −101.4 −70.9 −79.0 −87.0\n(S)-Linalool −100.7 −87.5 −102.1 −71.4 −70.4 −87.8\n(R)-Linalyl acetate −101.4 −88.9 −105.1 −73.0 −74.3 −82.5\n(S)-Linalyl acetate −102.8 −90.8 −106.0 −68.5 −74.5 −82.3\np-Mentha-1(7),8-diene −82.3 −82.2 −94.3 −69.5 −65.9 −79.3\n(+)-Menthol −82.9 −86.2 −95.0 −71.8 −66.6 −77.7\n(-)-Menthol −82.3 −84.5 −95.1 −71.1 −69.2 −79.4\nMenthone −83.2 −77.8 −94.7 −69.3 −70.0 −74.4\niso-Menthone −81.0 −79.8 −97.6 −64.4 −63.5 −80.1\nα-Muurolene −86.9 −81.9 −96.9 −72.0 −66.0 −83.7\n(+)-γ-Muurolene −82.3 −82.9 −83.1 −72.2 −66.6 −84.4\n(-)-γ-Muurolene −88.4 −86.2 −106.7 −74.5 −68.5 −86.8\nMyrcene −98.7 −90.1 −102.2 −74.9 −71.4 −84.3\nNeral −102.6 −91.8 −110.5 −81.5 −72.4 −91.2\n(E)-Nerolidol −110.7 −101.4 −113.8 −83.5 −76.1 −100.6\n(E)-β-Ocimene −97.0 −90.2 −103.6 −76.3 −75.6 −86.7\n(Z)-β-Ocimene −98.3 −88.7 −103.2 −78.6 −73.9 −85.1\nOctanal −89.7 −83.8 −99.5 −71.3 −72.4 −80.5\n(R)-2-Octen-3-ol −88.1 −88.4 −96.6 −71.9 −70.7 −81.9\n(S)-1-Octen-3-ol −94.2 −90.7 −93.4 −77.1 −74.7 −80.0\n3-Octanone −88.9 −85.3 −94.7 −71.7 −72.9 −80.3\nPatchouli alcohol −63.5 −57.1 −66.7 −51.8 −43.0 −67.9\n(R)-Phellandral −87.6 −85.9 −102.5 −74.4 −66.2 −81.1\n(S)-Phellandral −87.7 −83.7 −101.6 −74.4 −66.5 −79.2\n(R)-α-Phellandrene −81.1 −82.9 −92.5 −70.1 −65.3 −76.4\n(S)-α-Phellandrene −81.6 −82.5 −92.3 −69.7 −65.6 −76.6\n(R)-β-Phellandrene −84.4 −83.7 −94.0 −69.8 −65.5 −75.2\n(S)-β-Phellandrene −82.9 −84.5 −94.0 −71.2 −67.5 −77.7\nPhytol −106.3 −94.2 −118.9 −74.9 −75.6 −93.3\nPhytone −106.4 −94.3 −116.9 −79.8 −72.3 −90.4\n(+)-α-Pinene −79.0 −70.7 −79.7 −59.4 −54.6 −63.7\n(-)-α-Pinene −77.3 −70.4 −72.9 −61.3 −54.7 −63.6\n(+)-β-Pinene −76.8 −71.8 −79.4 −63.7 −53.0 −65.2\n(-)-β-Pinene −78.8 −73.6 −73.9 −61.9 −56.1 −64.7\n(+)-Pinocamphone −74.9 −72.6 −79.4 −63.2 −62.4 −66.4\n(-)-Pinocamphone −73.2 −79.3 −81.8 −62.0 −61.4 −67.2\n(+)-iso-Pinocamphone −74.9 −75.0 −74.9 −66.6 −55.1 −66.5\n(-)-iso-Pinocamphone −77.1 −80.7 −77.5 −64.0 −55.6 −68.3\n(+)-cis-Pinocarveol −73.9 −78.1 −79.5 −67.7 −57.4 −70.2\n(-)-cis-Pinocarveol −74.1 −76.5 −78.8 −67.0 −58.6 −66.3\n(+)-trans-Pinocarveol −74.7 −80.5 −78.7 −65.8 −57.2 −70.6\n(-)-trans-Pinocarveol −77.6 −80.0 −82.6 −60.5 −55.5 −70.8\n(+)-Piperitone oxide −82.0 −81.5 −98.5 −66.2 −65.2 −77.8\n(-)-Piperitone oxide −81.6 −83.9 −94.9 −68.6 −60.8 −82.8\n(-)-iso-Pulegol −82.5 −85.1 −98.8 −75.2 −66.7 −79.3\n(R)-Pulegone −84.0 −83.1 −96.1 −66.4 −65.5 −78.3\n(S)-Pulegone −83.6 −78.6 −93.3 −67.2 −66.2 −78.9\nRotundifolone −83.1 −79.0 −96.6 −66.4 −62.1 −80.7\n(+)-Sabinene −86.4 −84.0 −92.2 −70.5 −68.6 −77.4\n(-)-Sabinene −87.8 −85.9 −94.7 −71.5 −69.6 −77.0\ncis-Sabinene hydrate −82.4 −81.1 −92.4 −68.0 −60.8 −78.2\n(Z)-α-Santalol −105.7 −95.3 −108.8 −84.7 −70.7 −95.8\n(E)-β-Santalol −104.8 −95.6 −106.2 −77.0 −70.9 −86.6\n(Z)-β-Santalol −104.4 −94.4 −106.2 −79.8 −73.2 −92.2\nβ-Sesquiphellandrene −103.8 −99.0 −115.7 −84.8 −75.3 −101.1\nSpathulenol −90.7 −88.0 −98.4 −77.8 −67.9 −90.4\n(Z)-Spiroether −111.8 −84.9 −103.1 −87.1 −79.3 −102.0\nγ-Terpinene −81.3 −79.3 −93.2 −71.2 −65.3 −76.6\n(R)-Terpinen-4-ol −80.4 −81.9 −89.5 −69.0 −64.9 −75.3\n(S)-Terpinen-4-ol −82.1 −81.8 −88.0 −70.4 −64.4 −76.4\n(R)-α-Terpineol −82.6 −88.3 −91.6 −65.6 −66.0 −72.6\n(S)-α-Terpineol −88.7 −86.8 −94.1 −71.6 −63.5 −82.0\nTerpinolene −80.7 −80.1 −94.7 −68.8 −63.9 −77.4\n(-)-α-Thujone −87.2 −89.3 −94.5 −66.9 −69.2 −78.1\n(+)-β-Thujone −86.9 −80.5 −94.2 −73.7 −69.7 −79.2\nThymohydroquinone dimethyl ether −89.5 −82.8 −104.6 −73.1 −67.0 −85.0\nThymol −84.4 −87.5 −94.6 −72.9 −70.8 −78.4\n2-Undecanone −101.3 −94.0 −108.3 −78.4 −72.8 −90.2\nValencene −84.7 −81.7 −92.6 −74.4 −68.3 −81.7\n(+)-Verbenone −84.7 −73.2 −82.5 −68.4 −54.8 −71.2\n(-)-Verbenone −83.8 −77.7 −77.4 −65.4 −57.8 −68.0\nViridiflorene −86.8 −90.2 −91.0 −76.3 −69.4 −88.8\nα-Zingiberene −106.4 −100.5 −115.4 −82.7 −71.4 −98.6\na Human angiotensin-converting enzyme 2 (hACE2).\nTable 4 Normalized docking scores ( DSnorm, kJ/mol) of essential oil components with bovine odorant binding protein (BtOBP), cruzain, torpedo acetylcholinesterase (TcAChE), Bacillus anthracis nicotinate mononucleotide adenylytransferase (BaNadD), Russell’s viper phospholipase A2 (DrPLA2), and Escherichia coli l-aspartate aminotransferase (EcAspTA).\nCompound BtOBP Cruzain TcAChE BaNadD DrPLA2 EcAspTA\n1GT3 1ME3 6G1U 3HFJ 1FV0 2Q7W\n(E)-Anethole −90.2 −73.3 −96.8 −112.9 −85.3 −88.1\nallo-Aromadendrene −85.0 −70.6 −92.8 −105.8 −87.8 −79.6\nArtemiseole −84.8 −74.2 −84.2 −90.6 −68.0 −71.7\n(R)-Artemisia alcohol −88.4 −68.3 −89.5 −94.8 −80.7 −81.5\n(S)-Artemisia alcohol −86.1 −74.0 −94.8 −101.4 −82.5 −81.4\nArtemisia ketone −93.1 −77.3 −91.5 −107.9 −87.8 −80.6\nAscaridole −79.7 −54.4 −72.1 −79.7 −75.0 −65.3\nBenzyl benzoate −105.0 −82.8 −115.8 −128.1 −97.3 −89.9\n(Z)-trans-α-Bergamotol −1 00.7 −73.6 −107.0 −94.2 −92.6 −85.8\nBicyclogermacrene −97.5 −82.4 −95.6 −105.5 −89.7 −89.0\nBicyclosesquiphellandrene −92.2 −52.5 −91.2 −110.7 −88.4 −75.7\nα-Bisabolol oxide A −94.7 −66.1 −102.8 −102.6 −77.1 −82.7\nα-Bisabolol oxide B −104.6 −90.4 −107.0 −121.9 −94.2 −89.8\nBisabolone oxide A −100.1 −71.9 −96.8 −84.7 −81.2 −86.7\n(+)-Borneol −72.5 −51.0 −72.0 −47.8 −61.4 −62.5\n(-)-Borneol −78.3 −53.1 −70.8 −49.0 −63.3 −56.2\n(+)-iso-Borneol −73.7 −55.6 −74.6 −31.0 −60.9 −59.7\n(-)-iso-Borneol −73.2 −55.3 −77.7 −52.6 −51.0 −57.4\nα-Bulnesene −93.4 −89.3 −109.3 −115.7 −94.4 −95.3\nδ-Cadinene −79.5 −86.8 −105.1 −116.8 −94.8 −82.3\nΤ-Cadinol −87.8 −71.8 −117.7 −121.7 −86.0 −87.0\n(R)-Calamene −80.3 −84.4 −116.5 −120.4 −91.3 −87.7\n(S)-Calamene −80.1 −82.5 −116.2 −121.8 −93.0 −88.3\n(+)-Camphene −79.0 −62.1 −77.0 −75.9 −69.3 −67.5\n(-)-Camphene −77.7 −62.8 −75.2 −77.4 −71.3 −70.6\n(+)-Camphor −76.0 −57.0 −75.0 −49.0 −53.5 −54.1\n(-)-Camphor −80.0 −54.1 −74.4 −52.9 −61.2 −56.4\n(+)-δ-3-Carene −80.4 −64.2 −80.6 −88.0 −71.8 −72.5\n(-)-δ-3-Carene −82.0 −68.9 −84.4 −90.2 −72.8 −72.9\nCarvacrol −82.4 −77.7 −94.8 −106.7 −81.6 −87.5\nCarvacrol methyl ether −85.6 −79.3 −96.6 −111.5 −84.2 −93.6\n(+)-cis-Carveol −89.1 −77.3 −96.9 −109.4 −81.3 −87.6\n(-)-cis-Carveol −89.0 −82.1 −95.5 −109.0 −83.2 −89.4\n(R)-Carvone −86.0 −80.7 −94.6 −109.9 −83.5 −91.5\n(S)-Carvone −88.0 −77.2 −94.1 −105.9 −82.8 −87.2\n(E)-Caryophyllene −87.3 −60.4 −88.1 −87.3 −87.4 −78.6\nCaryophyllene oxide −95.1 −73.1 −90.1 −97.0 −83.8 −77.8\nCedrol −87.7 −63.1 −96.4 −84.4 −86.3 −70.9\nepi-Cedrol −84.0 −59.7 −83.3 −86.7 −80.0 −76.2\nChamazulene −95.2 −89.2 −123.0 −132.1 −98.9 −101.6\n(-)-cis-Chrystanthyl acetate −85.8 −63.7 −89.8 −73.8 −76.5 −71.5\n(-)-trans-Chrysanthenyl acetate −80.9 −69.7 −82.4 −78.5 −76.5 −68.6\n1,8-Cineole −69.3 −51.1 −73.2 −54.4 −49.4 −47.3\n(E)-Cinnamaldehyde −87.7 −77.6 −98.2 −110.1 −85.7 −89.5\n(E)-Cinnamyl acetate −95.9 −88.2 −107.4 −132.5 −94.6 −103.1\n(R)-Citronellal −98.1 −90.5 −109.3 −120.7 −88.3 −105.7\n(S)-Citronellal −95.0 −89.7 −108.5 −123.3 −86.9 −104.1\n(R)-Citronellol −91.0 −90.0 −108.2 −122.4 −88.6 −107.7\n(S)-Citronellol −92.5 −91.9 −108.5 −122.0 −90.3 −100.3\n(R)-Citronellyl formate −98.0 −93.5 −118.7 −129.5 −87.5 −108.5\n(S)-Citronellyl formate −99.7 −95.1 −111.2 −135.6 −91.5 −94.8\nα-Copaene −88.9 −69.9 −84.6 −78.7 −81.7 −61.9\nCostunolide −106.8 −87.5 −116.7 −120.1 −100.3 −89.1\n(R)-Cryptone −74.9 −68.1 −92.2 −100.0 −78.5 −80.8\n(S)-Cryptone −79.0 −68.5 −91.6 −100.7 −82.7 −79.6\nβ-Cubebene −99.8 −67.2 −106.9 −112.2 −93.9 −94.8\nCuminaldehyde −84.9 −79.1 −95.3 −109.1 −90.1 −89.5\nar-Curcumene −98.1 −87.5 −116.0 −125.7 −94.1 −95.3\nCurcumol −90.1 −67.6 −100.4 −88.0 −87.6 −81.5\nCurdione −96.4 −75.1 −99.3 −116.3 −91.0 −78.7\nCurzerene −96.4 −80.3 −109.4 −89.7 −91.1 −86.4\nm-Cymene −78.9 −73.1 −96.1 −99.1 −76.6 −88.0\no-Cymene −77.0 −61.9 −89.8 −97.8 −76.2 −77.2\np-Cymene −82.8 −73.2 −91.3 −96.8 −80.9 −84.3\n(E)-β-Damascenone −90.1 −80.5 −100.7 −105.4 −88.9 −80.0\n(2E,4E)-Decadienal −96.4 −87.0 −110.4 −129.7 −95.8 −114.8\nDodecanal −95.8 −83.7 −110.3 −127.3 −89.2 −108.9\nEremanthin −80.1 −87.9 −121.3 −132.4 −98.7 −91.8\nβ-Eudesmol −95.2 −76.1 −98.6 −114.1 −85.3 −87.1\nγ-Eudesmol −94.9 −78.2 −106.1 −105.2 −89.7 −89.1\nEugenol −90.4 −82.4 −103.9 −119.3 −87.3 −98.8\nEugenol methyl ether −93.6 −78.1 −106.3 −116.8 −89.3 −94.4\nEugenyl acetate −94.9 −83.4 −109.2 −126.1 −100.1 −104.6\n(E,E)-α-Farnesene −115.5 −103.7 −129.8 −131.8 −101.2 −111.4\n(E)-β-Farnesene −112.1 −103.2 −122.7 −131.8 −105.3 −108.6\n(E,E)-Farnesol −116.8 −96.2 −133.0 −135.6 −100.5 −109.0\n(+)-Fenchone −78.4 −60.5 −79.5 −79.8 −62.4 −69.9\n(-)-Fenchone −80.3 −61.5 −81.0 −84.2 −65.5 −60.7\nFlavesone −87.1 −56.0 −88.6 −92.1 −85.2 −80.3\nGeranial −96.5 −94.9 −111.7 −119.3 −92.1 −101.5\nGeraniol −95.5 −93.6 −109.7 −118.0 −94.3 −107.3\nGeranyl formate −100.2 −89.7 −115.4 −128.3 −94.8 −114.1\nGermacrene D −102.4 −88.8 −109.9 −116.5 −93.7 −90.0\nGermacrone −92.4 −68.3 −94.5 −102.9 −88.3 −80.0\nGuiaol −100.8 −88.5 −113.3 −107.5 −92.6 −94.0\nα-Gurjunene −80.6 −61.6 −84.6 −100.0 −83.6 −78.1\nβ-Gurjunene −89.3 −38.8 −80.3 11.3 −77.6 −71.1\nα-Himachalene −89.2 −67.9 −83.9 −96.3 −87.6 −73.4\nβ-Himachalene −81.9 −65.4 −96.1 −110.8 −91.4 −76.8\nHimachalol −91.5 −64.1 −81.2 −24.7 −81.7 −66.3\nα-Humulene −94.0 −80.0 −89.9 −113.6 −89.2 −82.5\nLeptospermone −89.6 −64.0 −92.2 −102.7 −88.8 −80.7\niso-Leptospermone −92.8 −63.0 −90.1 −99.4 −86.2 −78.2\n(R)-Limonene −86.2 −75.7 −92.4 −99.6 −81.7 −86.8\n(S)-Limonene −84.9 −77.6 −93.4 −99.8 −83.3 −87.3\n(R,S,R)-Limonene oxide −87.1 −76.0 −93.2 −110.7 −84.9 −86.3\n(S,R,R)-Limonene oxide −84.6 −68.8 −85.0 −84.3 −76.2 −69.8\n(S,R,S)-Limonene oxide −91.2 −73.8 −97.4 −93.6 −85.1 −87.9\n(R)-Linalool −95.5 −89.9 −116.6 −112.4 −90.3 −89.9\n(S)-Linalool −93.0 −88.9 −110.1 −111.9 −91.0 −95.7\n(R)-Linalyl acetate −96.9 −87.1 −107.1 −112.5 −87.1 −95.2\n(S)-Linalyl acetate −100.0 −90.5 −110.2 −114.3 −86.6 −87.1\np-Mentha-1(7),8-diene −83.3 −74.4 −93.6 −100.0 −82.9 −84.9\n(+)-Menthol −86.1 −66.4 −98.6 −106.1 −79.2 −90.8\n(-)-Menthol −81.0 −68.9 −97.5 −106.3 −80.5 −89.7\nMenthone −82.4 −72.0 −92.6 −98.2 −82.8 −83.5\niso-Menthone −79.9 −64.8 −88.2 −102.4 −75.1 −82.0\nα-Muurolene −91.2 −79.9 −95.6 −113.7 −90.0 −82.8\n(+)-γ-Muurolene −85.2 −77.0 −98.7 −113.9 −93.2 −78.7\n(-)-γ-Muurolene −83.1 −83.4 −96.9 −106.3 −82.9 −80.5\nMyrcene −90.4 −88.8 −109.0 −112.7 −90.3 −101.1\nNeral −95.1 −94.1 −111.1 −122.8 −90.9 −105.4\n(E)-Nerolidol −111.5 −101.8 −131.9 −131.3 −99.6 −110.5\n(E)-β-Ocimene −91.8 −89.4 −104.6 −116.4 −89.0 −97.0\n(Z)-β-Ocimene −89.7 −90.6 −106.8 −112.1 −90.3 −94.4\nOctanal −85.8 −79.8 −97.6 −112.0 −85.7 −102.7\n(R)-2-Octen-3-ol −84.3 −81.5 −106.9 −107.1 −83.3 −101.1\n(S)-1-Octen-3-ol −84.5 −82.4 −108.4 −105.9 −85.0 −99.5\n3-Octanone −84.2 −82.5 −102.6 −111.6 −82.9 −101.8\nPatchouli alcohol −75.1 −41.4 −71.1 100.1 −10.1 −49.2\n(R)-Phellandral −92.3 −79.3 −97.4 −108.1 −88.9 −89.5\n(S)-Phellandral −92.9 −79.9 −96.1 −109.2 −88.9 −88.8\n(R)-α-Phellandrene −84.0 −69.7 −94.7 −100.8 −82.4 −83.8\n(S)-α-Phellandrene −84.3 −69.6 −93.5 −99.4 −82.6 −80.6\n(R)-β-Phellandrene −82.2 −69.9 −93.5 −102.0 −80.6 −84.1\n(S)-β-Phellandrene −83.8 −69.0 −93.2 −100.5 −80.2 −81.2\nPhytol −112.8 −93.8 −132.4 −134.7 −102.4 −112.9\nPhytone −117.8 −92.1 −124.5 −131.1 −99.7 −107.2\n(+)-α-Pinene −74.2 −58.0 −73.4 −62.4 −62.5 −54.4\n(-)-α-Pinene −72.8 −58.3 −70.4 −64.6 −61.7 −57.2\n(+)-β-Pinene −70.9 −57.8 −74.0 −64.1 −60.9 −55.5\n(-)-β-Pinene −73.5 −58.4 −73.1 −65.0 −63.7 −57.0\n(+)-Pinocamphone −76.5 −58.2 −73.6 −53.1 −55.4 −63.6\n(-)-Pinocamphone −76.6 −66.1 −76.5 −65.9 −72.3 −62.7\n(+)-iso-Pinocamphone −75.3 −59.0 −76.6 −54.0 −59.1 −58.1\n(-)-iso-Pinocamphone −76.2 −59.6 −76.7 −56.4 −65.8 −56.2\n(+)-cis-Pinocarveol −75.7 −58.2 −75.2 −51.7 −57.5 −58.1\n(-)-cis-Pinocarveol −75.7 −63.9 −73.5 −52.5 −66.3 −54.5\n(+)-trans-Pinocarveol −77.5 −60.6 −76.5 −71.1 −63.9 −61.4\n(-)-trans-Pinocarveol −72.4 −58.6 −77.2 −71.4 −56.3 −62.6\n(+)-Piperitone oxide −88.5 −70.5 −100.5 −104.2 −80.4 −78.0\n(-)-Piperitone oxide −86.0 −73.6 −99.6 −104.5 −80.7 −83.8\n(-)-iso-Pulegol −85.1 −72.0 −93.5 −106.7 −83.5 −93.8\n(R)-Pulegone −81.8 −69.9 −90.3 −103.9 −78.4 −74.4\n(S)-Pulegone −79.7 −69.6 −89.3 −99.9 −81.5 −76.4\nRotundifolone −86.1 −72.1 −96.1 −100.0 −82.4 −72.1\n(+)-Sabinene −87.9 −66.6 −84.5 −92.1 −80.5 −78.2\n(-)-Sabinene −79.7 −68.4 −91.4 −96.0 −80.8 −75.8\ncis-Sabinene hydrate −88.1 −70.2 −84.5 −91.1 −72.3 −68.1\n(Z)-α-Santalol −108.5 −85.6 −113.4 −106.8 −96.8 −90.7\n(E)-β-Santalol −105.0 −90.2 −110.6 −113.3 −94.3 −94.0\n(Z)-β-Santalol −108.0 −85.3 −110.4 −110.9 −96.5 −92.6\nβ-Sesquiphellandrene −103.9 −92.2 −116.6 −127.5 −99.4 −98.3\nSpathulenol −95.9 −94.8 −97.7 −102.8 −84.3 −102.2\n(Z)-Spiroether −112.8 −85.5 −124.3 −136.1 −101.5 −102.9\nγ-Terpinene −84.3 −74.9 −93.4 −98.7 −82.8 −85.9\n(R)-Terpinen-4-ol −87.3 −66.7 −81.5 −94.0 −80.2 −72.2\n(S)-Terpinen-4-ol −87.1 −67.2 −78.9 −92.3 −80.2 −71.7\n(R)-α-Terpineol −82.0 −68.0 −80.3 −82.2 −77.6 −71.3\n(S)-α-Terpineol −76.9 −75.5 −103.6 −101.7 −86.6 −84.9\nTerpinolene −83.1 −69.8 −89.0 −101.8 −84.8 −72.9\n(-)-α-Thujone −81.4 −66.2 −84.9 −93.4 −72.6 −74.1\n(+)-β-Thujone −87.6 −66.4 −89.9 −102.9 −71.7 −86.9\nThymohydroquinone dimethyl ether −86.3 −75.8 −103.7 −116.0 −85.3 −95.5\nThymol −84.4 −70.8 −96.4 −107.1 −79.7 −91.8\n2-Undecanone −94.5 −90.2 −110.0 −129.7 −91.9 −107.6\nValencene −96.7 −75.1 −103.3 −114.7 −87.8 −76.6\n(+)-Verbenone −74.3 −64.5 −79.3 −71.6 −63.9 −72.3\n(-)-Verbenone −73.5 −63.1 −78.0 −65.3 −64.8 −59.3\nViridiflorene −81.9 −68.6 −102.1 −106.9 −73.1 −81.9\nα-Zingiberene −108.3 −90.9 −113.8 −123.4 −97.7 −99.9 "}