A, USA).
The PDB IDs of the target proteins were as follows: Angiotensin converting enzyme (PDB ID: 1O8A), SARS-CoV spike glycoprotein (PDB ID: 5WRG), SARS-CoV-2 spike glycoprotein (PDB ID: 6VXX), SARS-CoV-2 main protease (PDB ID: 6LU7), SARS-CoV main protease (3CL-pro) structure (PDB ID: IP9U), papain like protease of SARS-C