Ethyl 2,4-dioxopyrrolidine-3-carboxylate

3-[5-({[(9H-fluoren-9-yl)methoxy]carbonyl}amino)hexanamido]-4,4,4-trifluorobutanoic acid

3-[(2S)-2-({[(9H-fluoren-9-yl)methoxy]carbonyl}amino)-3-methylpentanamido]-4,4,4-trifluorobutanoic acid

3-[(2S)-2-({[(9H-fluoren-9-yl)methoxy]carbonyl}amino)-4-(methylsulfanyl)butanamido]-4,4,4-trifluorobutanoic acid

3-[(3S)-N-tert-butyl-3-({[(9H-fluoren-9-yl)methoxy]carbonyl}amino)butanamido]propanoic acid

1-[3-({[(9H-fluoren-9-yl)methoxy]carbonyl}amino)cyclobutanecarbonyl]piperidine-4-carboxylic acid

4-[(1s,3s)-3-({[(9H-fluoren-9-yl)methoxy]carbonyl}amino)cyclobutaneamido]cyclopent-2-ene-1-carboxylic acid

(2S)-2-phenyl-2-{[(1rs,3rs)-3-({[(9H-fluoren-9-yl)methoxy]carbonyl}amino)cyclobutyl]formamido}acetic acid

2-{3-[3-({[(9H-fluoren-9-yl)methoxy]carbonyl}amino)cyclobutaneamido]phenyl}acetic acid

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

2-[2-({[(9H-fluoren-9-yl)methoxy]carbonyl}amino)-4-methyl-1,3-thiazole-5-carbonyl]-2-azabicyclo[2.1.1]hexane-1-carboxylic acid