2,2-Dimethyl-propionic acid 4-(4-cyano-2-nitro-phenylamino)-butyl ester

2-(3-{[3-({[(9H-fluoren-9-yl)methoxy]carbonyl}amino)-2,2-dimethylpropanamido]methyl}cyclobutyl)acetic acid

2-(3-{[3-({[(9H-fluoren-9-yl)methoxy]carbonyl}amino)-3-methylbutanamido]methyl}cyclobutyl)acetic acid

rac-2-[(3R,4R)-1-[3-cyclopropyl-2-({[(9H-fluoren-9-yl)methoxy]carbonyl}amino)propanoyl]-4-methylpyrrolidin-3-yl]acetic acid

2-[(3RS,4RS)-1-[(2S)-3-cyclopropyl-2-({[(9H-fluoren-9-yl)methoxy]carbonyl}amino)propanoyl]-4-methylpyrrolidin-3-yl]acetic acid

rac-2-[(3R,4R)-1-[3-cyclopropyl-3-({[(9H-fluoren-9-yl)methoxy]carbonyl}amino)propanoyl]-4-methylpyrrolidin-3-yl]acetic acid

rac-2-[(3R,4R)-1-[3-({[(9H-fluoren-9-yl)methoxy]carbonyl}amino)cyclopentanecarbonyl]-4-methylpyrrolidin-3-yl]acetic acid

rac-2-[(3R,4R)-1-[2-({[(9H-fluoren-9-yl)methoxy]carbonyl}amino)cyclopentanecarbonyl]-4-methylpyrrolidin-3-yl]acetic acid

rac-3-ethyl-1-[(1R,3R)-3-({[(9H-fluoren-9-yl)methoxy]carbonyl}amino)cyclohexanecarbonyl]azetidine-3-carboxylic acid

1-{2-[({[(9H-fluoren-9-yl)methoxy]carbonyl}amino)methyl]cyclopropanecarbonyl}-3-(prop-2-en-1-yl)azetidine-3-carboxylic acid

rac-1-[(1R,2S)-2-[({[(9H-fluoren-9-yl)methoxy]carbonyl}amino)methyl]cyclopropanecarbonyl]-3-(prop-2-en-1-yl)azetidine-3-carboxylic acid