ethyl (4R)-4-[((2R,5S)-2-(4-fluorobenzyl)-6-methyl-5-{[(5-methylisoxazol-3-yl)carbonyl]amino}-4-oxoheptanoyl)amino]-5-[(3S)-2-oxopyrrolidin-3-yl]pentanoate
ethyl (4r)-4-[((2r,5s)-2-(4-fluorobenzyl)-6-methyl-5-{[(5-methylisoxazol-3-yl)carbonyl]amino}-4-oxoheptanoyl)amino]-5-[(3s)-2-oxopyrrolidin-3-yl]pentanoate