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Interaction of SARS-CoV-2 3CLpro protease residues with retusin (2). A Map of the interaction of residues. B Protease 3CLpro (PDBid: 6XQT) in gray and residues within a radius of proximity equal to 5 Å of the ligand, represented by sticks. The ligand is in orange, and the catalytic dyad residues His41 and Cys145 and the residue Glu166 are in lavender. C The representation shows the interaction of these residues with the ligand
