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Superposition of the SARS-CoV-2 3CLpro structures in complex with 16d (gray), 17d (gold) and 15d (coral). A) Rendering showing the differences in the inhibitors in the S4 subsite. B) Surface representations showing the position of the inhibitors in the S4 pocket with neighboring residues are colored yellow (nonpolar), cyan (polar), and white (weakly polar). PDB IDs: 15d (8E68), 16d (8E69), 17d (8E6A).
