(2R,3S)-N-((1S,2S)-2-((2S,3R)-3-((S)-2-(2-naphthamido)propanamido)-5-phenylpentan-2-yl)cyclopropyl)-3-((S)-sec-butyl)-4-oxooxetane-2-carboxamide

methyl (R)-2-((S)-2-((1R,2S)-2-(((tert-butyldiphenylsilyl)oxy)methyl)cyclopropyl)propanamido)-2-phenylacetate

(2R,3S)-N-((1S,2S)-2-((2S,3R)-3-((S)-2-aminopropanamido)-5-phenylpentan-2-yl)cyclopropyl)-3-((S)-sec-butyl)-4-oxooxetane-2-carboxamide

benzyl ((S)-1-(((3R,4S)-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

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