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Orientation of the inhibitors containing an aromatic substituent to SARS-CoV-2 3CLpro highlighting the S4 subsite: 1c (A), 5c (B), 6c (C), and 10d (D). Surface representation showing the orientation of the inhibitors near the S4 subsite of SARS-CoV-2 3CLpro with neighboring residues colored yellow (nonpolar), cyan (polar), and white (weakly polar).
