2-{1-[3-({[(9H-fluoren-9-yl)methoxy]carbonyl}amino)oxolan-2-yl]-N-(2,2,2-trifluoroethyl)formamido}acetic acid

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

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

(2R)-2-({3-[({[(9H-fluoren-9-yl)methoxy]carbonyl}amino)methyl]cyclohexyl}formamido)propanoic acid

(2R)-1-[4-({[(9H-fluoren-9-yl)methoxy]carbonyl}amino)-2-methylbutanoyl]-4,4-difluoropyrrolidine-2-carboxylic acid

(2R)-1-[(2R)-2-({[(9H-fluoren-9-yl)methoxy]carbonyl}amino)pentanoyl]-4,4-difluoropyrrolidine-2-carboxylic acid

4-[(2S)-2-({[(9H-fluoren-9-yl)methoxy]carbonyl}amino)-3-methylbutanamido]-2-methylbut-2-enoic acid

2-{N-ethyl-1-[3-({[(9H-fluoren-9-yl)methoxy]carbonyl}amino)bicyclo[3.1.0]hexan-1-yl]formamido}acetic acid

1-({[5-({[(9H-fluoren-9-yl)methoxy]carbonyl}amino)cyclohex-3-en-1-yl]formamido}methyl)cyclopropane-1-carboxylic acid

1-[5-({[(9H-fluoren-9-yl)methoxy]carbonyl}amino)cyclohex-3-ene-1-carbonyl]-3-methylpyrrolidine-2-carboxylic acid

(2S)-2-{1-[(1RS,5SR)-5-({[(9H-fluoren-9-yl)methoxy]carbonyl}amino)cyclohex-3-en-1-yl]-N-methylformamido}propanoic acid