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X-ray structure of SARS-CoV-2 3CLpro bound with compound 9d at 1.65 Å. Polder electron density omit maps (mFobs – DFmodel ) surrounding 9d and Cys145. Electron density is contoured at 3.5 σ. (+) density is colored pink and (−) density is colored green but is not visible. Final Rwork = 12.6% and Rfree = 17.4%. The thioester bond between Cys145 and 9d is clearly visible. (PDB code:7RC0).
