4-(7-Azidoheptylsulfinyl)-2-(2,6-dioxo-3-piperidyl)isoindoline-1,3-dione

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

3-[N-ethyl-4-({[(9H-fluoren-9-yl)methoxy]carbonyl}amino)-2-methylbutanamido]butanoic acid

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

rac-4-{[(2R,3S)-3-({[(9H-fluoren-9-yl)methoxy]carbonyl}amino)oxolan-2-yl]formamido}-3-hydroxybutanoic acid

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

2-[(2S)-2-({[(9H-fluoren-9-yl)methoxy]carbonyl}amino)-3-methylbutanoyl]-2-azabicyclo[2.2.2]octane-6-carboxylic acid

1-[2-({[(9H-fluoren-9-yl)methoxy]carbonyl}amino)-N-methylhexanamido]cyclopropane-1-carboxylic acid

2-({2-[({[(9H-fluoren-9-yl)methoxy]carbonyl}amino)methyl]-1,3-thiazol-5-yl}formamido)-3-hydroxy-2-methylpropanoic acid

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

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