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The RMSD and RMSF of Cα protein of apo S protein bound to ACE2 and of each docked complex of S protein bound to ACE2 and salvianolic acid b, quercetin, and rosmarinic acid, define the residues in the binding site with yellow dashes. The RMSD of salvianolic acid b, quercetin, and rosmarinic acid is aligned with respect to their initial ligand positions.
