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X-ray crystal structure of compound 44 in the active site of SARS-CoV-2 PLpro (PDB code: 3MJ5), and showing the most important interactions with residues Leu163, Gly164, Asp165, Pro248, Pro249, Tyr265, Tyr269, and Tyr274 (graphic image was analyzed by Discovery Studio Visualizer v4.5.).
