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

(9H-fluoren-9-yl)methyl ((3R,4R)-4-((1S,2S)-2-(hydroxymethyl)cyclopropyl)-1-phenylpentan-3-yl)carbamate

tert-butyl ((1S,2S)-2-((2R,3R)-3-((S)-2-(((benzyloxy)carbonyl)amino)propanamido)-5-phenylpentan-2-yl)cyclopropyl)carbamate

tert-butyl ((1S,2S)-2-((2R,3R)-3-(2-naphthamido)-5-phenylpentan-2-yl)cyclopropyl)carbamate

(9H-fluoren-9-yl)methyl ((3R,4R)-4-((1S,2S)-2-formylcyclopropyl)-1-phenylpentan-3-yl)carbamate