PDB ID: 5GWY Macromolecule: 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 MAIN PROTEASE Source Organism: Human coronavirus NL63 synthetic construct