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(A) The ribbon and surface representation of the SARS-CoV-2 3CLpro (PDB ID: 7L13) with the inhibitor-bound active site; (B) the active site of SARS-CoV-2 3CLpro (PDB ID: 7L13) along with sub-sites; (C) non-covalent inhibitor-bound SARS-CoV-2 3CLpro (PDB ID: 7L13) active site with important sub-sites.
