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

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

(1S,2S)-2-((2R,3R)-3-((((9H-fluoren-9-yl)methoxy)carbonyl)amino)-5-phenylpentan-2-yl)cyclopropane-1-carboxylic acid

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