(4R)-4-{[(2S)-2-(acetylamino)-3-carboxypropanoyl]amino}-5-{[(2S,3S)-1-{[(2S)-1-{(2S,4R)-4-(benzyloxy)-2-[(2-methyl-2-{[(1S)-1-phenylethyl]carbamoyl}hydrazinyl)carbonyl]pyrrolidin-1-yl}-3-methyl-1-oxobutan-2-yl]amino}-3-methyl-1-oxopentan-2-yl]amino}-5-oxo