N(1)-[(3R)-1-((2S)-2-{[(benzyloxy)carbonyl]amino}-4-methylpentyl)-4-oxopyrrolidin-3-yl]-N(2)-[(pyridin-4-ylmethoxy)carbonyl]-L-leucinamide
n(1)-[(3r)-1-((2s)-2-{[(benzyloxy)carbonyl]amino}-4-methylpentyl)-4-oxopyrrolidin-3-yl]-n(2)-[(pyridin-4-ylmethoxy)carbonyl]-l-leucinamide