20, Asn221, Gly271, Lys270, Thr222, Arg267, Leu263
Table 10.  Binding energies of WS phytoconstituents with SARS-CoV-2 main protease/3CL-pro (PDB ID: 6LU7) in comparison to the FDA approved standard reference drugs (Oberadilol and Poziotinib).
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S. No.  Ligands  BE (kcal/mol)   K d  Interacting amino acids  BE(kcal/mol)  Kd  Int