In addition to the above investigations, a molecular docking study was performed to estimate the binding affinity and their binding pose of the ligand molecules at the binding site of the SARS-CoV-2 RBD Spro. From the study, it is observed that Piperine has the highest interaction affinity among the screened compounds. The docked poses of the four ligand molecules (Piperine, Capsaicin, Gingerol and Terpinen-4-ol) along with their 2D interaction diagram having the highest binding affinity, among the selected molecules, are presented in descending order in Figure 3. From Table 1, it is observed that these four molecules follow the trend for their binding affinity with Piperine (−6.4 kcal/mol) at the highest, then Capsaicin, Ginerol and Terpinen-4-ol (all having −5.5 kcal/mol) among all the selected molecules. From Figure 3(a), it is observed that Piperine is associated with hydrogen bond interaction with GLY164 and GLY170. TYR173 (TYR505) and SER162 (SER494) are involved with pi–pi T-shaped and carbon-hydrogen bond interactions, respectively. The binding process is also governed by van der Waals interactions with the residues ARG71, TYR121 (TYR453), TYR163 (TYR495) and ASN169 (ASN501) of SARS-CoV-2 RBD Spro. Hence, the interaction of Piperine with SARS-CoV-2 RBD Spro is stabilized by covalent hydrogen bonding, pi–pi T-shaped and van der Waals interactions with a good affinity score. Capsaicin interacts with the residues GLY164 and TYR173 (TYR505) through pi-Donor hydrogen bond and pi–pi T-shaped interactions with the benzene ring, respectively (Figure 3(b)). The residues ARG71 (ARG403), ASP73, GLU74, GLN77, LYS85, TYR121 (TYR453), SER162 (SER494), TYR163 (TYR495) and ASN169 (ASN501) are involved with van der Waals interaction with Capsaicin.