1 9IN N-(3-furoyl)-D-valyl-L-valyl-N~1~-((1r,2z)-4-ethoxy-4-oxo-1-{[(3s)-2-oxopyrrolidin-3-yl]methyl}but-2-enyl)-D-leucinamide 1.000 2 I12 N-[(5-methylisoxazol-3-yl)carbonyl]-L-alanyl-L-valyl-N~1~-((1s)-4-ethoxy-4-oxo-1-{[(3s)-2-oxopyrrolidin-3-yl]methyl}but-2-enyl)-L-leucinamide 0.894