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Amentoflavone (green), 7-O-galloylquercetin (yellow), and gallagic acid (magenta) docking positions on human ACE-2 (SARS-CoV-2 RBD spike protein binding site), in surface view (A). Contacts of SARS-CoV-2 Spike protein active site residues with amentoflavone (B), gallagic acid (C), and kaempferitrin (D) are depicted in a two-dimensional diagram. Dashed black lines indicate hydrogen bonds; full green lines indicate van der Waals interactions.
