3-{[3-(dimethylamino)cyclohexyl]carbamoyl}-3-({[(9H-fluoren-9-yl)methoxy]carbonyl}amino)propanoic acid

4-[(2S)-2-({[(9H-fluoren-9-yl)methoxy]carbonyl}amino)-4-(methylsulfanyl)butanoyl]thiomorpholine-2-carboxylic acid

2-{5-methyl-1-[(2-methylphenyl)methyl]-1H-1,2,3-triazol-4-yl}acetonitrile

4-[3-({[(9H-fluoren-9-yl)methoxy]carbonyl}amino)-2-(propan-2-yl)butanamido]but-2-ynoic acid

4-[2-({[(9H-fluoren-9-yl)methoxy]carbonyl}amino)-4-methylhexanamido]but-2-ynoic acid

4-{[1-benzyl-4-({[(9H-fluoren-9-yl)methoxy]carbonyl}amino)piperidin-4-yl]formamido}but-2-ynoic acid

4-[3-({[(9H-fluoren-9-yl)methoxy]carbonyl}amino)-4,4,4-trifluorobutanamido]but-2-ynoic acid

1-{1-[(Tert-butoxy)carbonyl]-4-hydroxypiperidin-4-yl}-2-methylcyclopropane-1-carboxylic acid

rac-1-({[(1R,3R)-3-({[(9H-fluoren-9-yl)methoxy]carbonyl}amino)cyclohexyl]formamido}methyl)cyclobutane-1-carboxylic acid

(2S)-1-[(1RS,3RS)-3-({[(9H-fluoren-9-yl)methoxy]carbonyl}amino)cyclohexanecarbonyl]piperidine-2-carboxylic acid

rac-2-{[(1R,3R)-3-({[(9H-fluoren-9-yl)methoxy]carbonyl}amino)cyclohexyl]formamido}-3,3,3-trifluoropropanoic acid