2,2-Dimethylazetidin-3-ol

5-[(2R)-2-({[(9H-fluoren-9-yl)methoxy]carbonyl}amino)-3,3-dimethylbutanoyl]-5-azaspiro[2.4]heptane-7-carboxylic acid

5-[(2S)-2-({[(9H-fluoren-9-yl)methoxy]carbonyl}amino)-4-(methylsulfanyl)butanoyl]-5-azaspiro[2.4]heptane-7-carboxylic acid

3-({[(9H-fluoren-9-yl)methoxy]carbonyl}amino)-3-{[(5-methyl-1H-pyrazol-3-yl)methyl]carbamoyl}propanoic acid

1-[2-({[(9H-fluoren-9-yl)methoxy]carbonyl}amino)acetyl]-4,4-difluoropiperidine-3-carboxylic acid

1-[4-({[(9H-fluoren-9-yl)methoxy]carbonyl}amino)but-2-enoyl]-4,4-difluoropiperidine-3-carboxylic acid

1-[2-({[(9H-fluoren-9-yl)methoxy]carbonyl}amino)pent-4-enoyl]-4,4-difluoropiperidine-3-carboxylic acid

1-[4-({[(9H-fluoren-9-yl)methoxy]carbonyl}amino)-3-methylbutanoyl]-4,4-difluoropiperidine-3-carboxylic acid

(1rs,3rs)-3-[(2S)-2-({[(9H-fluoren-9-yl)methoxy]carbonyl}amino)-3-methylpentanamido]cyclobutane-1-carboxylic acid

3-[2-({[(9H-fluoren-9-yl)methoxy]carbonyl}amino)-1-methylcyclopentaneamido]cyclobutane-1-carboxylic acid

3-[4-({[(9H-fluoren-9-yl)methoxy]carbonyl}amino)oxane-4-amido]cyclobutane-1-carboxylic acid