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

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

3-{[5-({[(9H-fluoren-9-yl)methoxy]carbonyl}amino)cyclohex-3-en-1-yl]formamido}-2-methylbutanoic acid

2-({2-[({[(9H-fluoren-9-yl)methoxy]carbonyl}amino)methyl]cyclopropyl}formamido)butanoic acid

3-({2-[({[(9H-fluoren-9-yl)methoxy]carbonyl}amino)methyl]cyclopropyl}formamido)-2,2-difluoropropanoic acid

(1rs&,4rs&)-4-({[(1RS,2SR)-2-[({[(9H-fluoren-9-yl)methoxy]carbonyl}amino)methyl]cyclopropyl]formamido}methyl)cyclohexane-1-carboxylic acid

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

4-({3-[({[(9H-fluoren-9-yl)methoxy]carbonyl}amino)methyl]-2,2-difluorocyclopropyl}formamido)-3-methoxybutanoic acid

(2S,3S)-2-{[(1RS,3SR)-3-[({[(9H-fluoren-9-yl)methoxy]carbonyl}amino)methyl]-2,2-difluorocyclopropyl]formamido}-3-methylpentanoic acid

4-{2-[({[(9H-fluoren-9-yl)methoxy]carbonyl}amino)methyl]cyclopropaneamido}oxolane-3-carboxylic acid

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