(2S)-[(2S)-benzyloxycarbonylaminopropionylamino]-5-{[(3S)-((1S)-methylpropyl)-4-oxooxetane-(2R)-carbonyl]amino}pentanoic acid benzyl ester

(2S,3S)-2-((R)-2-Benzyloxy-1-hydroxy-ethyl)-3-methyl-pentanoic acid