(2R,3S)-N-((1S,2S)-2-((R)-2-((S)-2-aminopropanamido)-4-phenylbutyl)cyclopropyl)-3-((S)-sec-butyl)-4-oxooxetane-2-carboxamide

benzyl ((S)-1-(((R)-1-((1S,2S)-2-((2R,3S)-3-((S)-sec-butyl)-4-oxooxetane-2-carboxamido)cyclopropyl)-4-phenylbutan-2-yl)amino)-1-oxopropan-2-yl)carbamate

(9H-fluoren-9-yl)methyl ((R)-1-((1S,2S)-2-((tert-butoxycarbonyl)amino)cyclopropyl)-4-phenylbutan-2-yl)carbamate

tert-butyl ((1S,2S)-2-((R)-2-((S)-2-(((benzyloxy)carbonyl)amino)propanamido)-4-phenylbutyl)cyclopropyl)carbamate

(2R,3S)-N-((1S,2S)-2-((R)-2-(2-naphthamido)-4-phenylbutyl)cyclopropyl)-3-((S)-sec-butyl)-4-oxooxetane-2-carboxamide