PDB ID: 3IWM Macromolecule: 3C-LIKE PROTEINASE N-[(5-METHYLISOXAZOL-3-YL)CARB ONYL]ALANYL-L-VALYL-N~1~-((1R, 2Z)-4-(BENZYLOXY)-4-OXO-1-{[(3 R)-2-OXOPYRROLIDIN-3-YL]METHYL }BUT-2-ENYL)-L-LEUCINAMIDE Source Organism: Severe acute respiratory syndrome-related coronavirus synthetic construct