(E)-3-Piperidin-4-yl-acrylic acid

4-[(2R,3S)-3-(benzyloxy)-2-({[(9H-fluoren-9-yl)methoxy]carbonyl}amino)butanoyl]-1,4-oxazepane-6-carboxylic acid

1-[(2R,3S)-3-(benzyloxy)-2-({[(9H-fluoren-9-yl)methoxy]carbonyl}amino)butanoyl]-4,4-difluoropyrrolidine-3-carboxylic acid

3-{2-[3-(benzyloxy)-2-({[(9H-fluoren-9-yl)methoxy]carbonyl}amino)butanamido]ethoxy}propanoic acid

1-{[(2R,3S)-3-(benzyloxy)-2-({[(9H-fluoren-9-yl)methoxy]carbonyl}amino)butanamido]methyl}cyclopropane-1-carboxylic acid

4-({[(9H-fluoren-9-yl)methoxy]carbonyl}amino)-5-(3-hydroxy-3-propylazetidin-1-yl)-5-oxopentanoic acid

4-{2-[5-({[(9H-fluoren-9-yl)methoxy]carbonyl}amino)pyridin-2-yl]acetamido}but-2-enoic acid

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

3-chloro-4-[1-({[(9H-fluoren-9-yl)methoxy]carbonyl}amino)cyclobutaneamido]benzoic acid

(2S)-1-[3-({[(9H-fluoren-9-yl)methoxy]carbonyl}amino)-4,4-dimethylpentanoyl]piperidine-2-carboxylic acid

(2R)-2-[3-({[(9H-fluoren-9-yl)methoxy]carbonyl}amino)hexanamido]butanoic acid