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MG-132 is covalently bound to Cys145 in Mpro active site. (a) Left panel: chemical structure of MG-132, right panel: chemical structure of MG-132 covalently bound to Cys145. (b) X-ray crystal structure of MG-132 covalently bound to Cys145 with 2Fo-Fc map contoured at 1 sigma. (c) Main interactions of MG-132 with active site residues. Hydrogen bonds (blue dashed lines), hydrophobic interactions (grey dashed lines).
