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(i) X-ray structure of the inhibitor 41 in complex with R188I SARS 3CLpro (PDB code 4TWW) and molecular graphics image around the P1 and P2 sites. (ii) X-ray structure of the inhibitor 1 in complex with R188I SARS 3CLpro (Ref. 13; PDB code 4ATW) and molecular graphics image around the P1 and P2 sites.
