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

3-{[3-({[(9H-fluoren-9-yl)methoxy]carbonyl}amino)cyclobutyl]formamido}-4,4,4-trifluorobutanoic acid

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

rac-(1R,2S)-2-({2-[2-({[(9H-fluoren-9-yl)methoxy]carbonyl}amino)acetamido]acetamido}methyl)cyclopropane-1-carboxylic acid

rac-(1R,3S)-3-{[2-ethyl-2-({[(9H-fluoren-9-yl)methoxy]carbonyl}amino)butanamido]methyl}-2,2-difluorocyclopropane-1-carboxylic acid

3-({[2-({[(9H-fluoren-9-yl)methoxy]carbonyl}amino)-1,3-thiazol-4-yl]formamido}methyl)-2,2-difluorocyclopropane-1-carboxylic acid

2-({[4-({[(9H-fluoren-9-yl)methoxy]carbonyl}amino)oxan-4-yl]formamido}methyl)cyclopropane-1-carboxylic acid

(1RS,2SR)-2-{[(2R)-2-({[(9H-fluoren-9-yl)methoxy]carbonyl}amino)-2-phenylacetamido]methyl}cyclopropane-1-carboxylic acid

2-[({4-[({[(9H-fluoren-9-yl)methoxy]carbonyl}amino)methyl]oxan-4-yl}formamido)methyl]cyclopropane-1-carboxylic acid

rac-(1R,2S)-2-({[4-bromo-3-({[(9H-fluoren-9-yl)methoxy]carbonyl}amino)phenyl]formamido}methyl)cyclopropane-1-carboxylic acid

4-(dimethylamino)-2-[(3R)-3-({[(9H-fluoren-9-yl)methoxy]carbonyl}amino)butanamido]butanoic acid