(3R)-N-cyclohexyl-5-oxo-2,3,5,9b-tetrahydro[1,3]thiazolo[2,3-a]isoindole-3-carboxamide

3-{[(1-ethyl-1H-pyrazol-4-yl)methyl](methyl)carbamoyl}-3-({[(9H-fluoren-9-yl)methoxy]carbonyl}amino)propanoic acid

4-{[2-(1,3-dithiolan-2-yl)ethyl]carbamoyl}-4-({[(9H-fluoren-9-yl)methoxy]carbonyl}amino)butanoic acid

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

4-[4-({[(9H-fluoren-9-yl)methoxy]carbonyl}amino)but-2-enamido]-3-hydroxy-3-methylbutanoic acid

(2S)-2-{2-[({[(9H-fluoren-9-yl)methoxy]carbonyl}amino)methyl]-N,2-dimethylbutanamido}propanoic acid

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

4-{[3-({[(9H-fluoren-9-yl)methoxy]carbonyl}amino)cyclopentyl]formamido}but-2-enoic acid

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

3-[(2S)-3-cyclopropyl-2-({[(9H-fluoren-9-yl)methoxy]carbonyl}amino)propanamido]-2-hydroxypropanoic acid

2-{4-[2-({[(9H-fluoren-9-yl)methoxy]carbonyl}amino)hex-5-enoyl]thiomorpholin-3-yl}acetic acid