Dioxopiperazinylpropan

(2S,4R)-1-[2-({[(9H-fluoren-9-yl)methoxy]carbonyl}amino)-3,3,3-trifluoro-2-methylpropanoyl]-4-hydroxypyrrolidine-2-carboxylic acid

2-({[5-({[(9H-fluoren-9-yl)methoxy]carbonyl}amino)-1H-1,2,4-triazol-3-yl]formamido}methyl)-4-methylpentanoic acid

2-{[2-({[(9H-fluoren-9-yl)methoxy]carbonyl}amino)-4-methoxybutanamido]methyl}-4-methylpentanoic acid

3-{[4-({[(9H-fluoren-9-yl)methoxy]carbonyl}amino)-2-methoxyphenyl]formamido}propanoic acid

5-[(2R,6S)-2,6-dimethylmorpholin-4-yl]-4-({[(9H-fluoren-9-yl)methoxy]carbonyl}amino)-5-oxopentanoic acid

(2R)-2-{[4-({[(9H-fluoren-9-yl)methoxy]carbonyl}amino)cyclopent-2-en-1-yl]formamido}-4-(methylsulfanyl)butanoic acid

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

2-{1-[4-({[(9H-fluoren-9-yl)methoxy]carbonyl}amino)cyclopent-2-ene-1-carbonyl]piperidin-3-yl}acetic acid

2-(1-{3-[({[(9H-fluoren-9-yl)methoxy]carbonyl}amino)methyl]pentanoyl}piperidin-4-yl)acetic acid

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