3-[(3-cyano-4-fluorophenyl)carbamoyl]-3-({[(9H-fluoren-9-yl)methoxy]carbonyl}amino)propanoic acid

3-{[1-({[(9H-fluoren-9-yl)methoxy]carbonyl}amino)cyclopentyl]formamido}hexanoic acid

3-{2-[({[(9H-fluoren-9-yl)methoxy]carbonyl}amino)methyl]pentanamido}hexanoic acid

rac-(3R,4R)-1-[2-({[(9H-fluoren-9-yl)methoxy]carbonyl}amino)propanoyl]-4-(trifluoromethyl)pyrrolidine-3-carboxylic acid

4-[(2S)-2-({[(9H-fluoren-9-yl)methoxy]carbonyl}amino)-4-methylpentanamido]cyclopent-2-ene-1-carboxylic acid

6-Fluoro-3-hydroxy-2-methylbenzaldehyde

2-[(2S,3S)-N-tert-butyl-2-({[(9H-fluoren-9-yl)methoxy]carbonyl}amino)-3-methylpentanamido]acetic acid

2-[N-ethyl-6-({[(9H-fluoren-9-yl)methoxy]carbonyl}amino)-4,4-dimethylhexanamido]acetic acid

2-[N-ethyl-6-({[(9H-fluoren-9-yl)methoxy]carbonyl}amino)-2-methylheptanamido]acetic acid

4-[cyclohexyl(methyl)carbamoyl]-4-({[(9H-fluoren-9-yl)methoxy]carbonyl}amino)butanoic acid

3-{N-ethyl-2-[({[(9H-fluoren-9-yl)methoxy]carbonyl}amino)methyl]-3-methylbutanamido}-2-methylpropanoic acid