(a–e) Final conformations of inhibitors 1, 2, 3, 4, and control. (f) Averaged root-mean-square deviation for the critical amino acids in each inhibitor and for the whole inhibitors when binding with the RBD of SARS-CoV-2. Numbering scale: 1–4, inhibitors 1–4 with RBD; C, control system of PD from ACE2 and the RBD of SARS-CoV-2. (g) Average interaction energies between the contact residues of inhibitors 1–4 (or ACE2) and the RBD of SARS-CoV-2.