ethyl (1R,2S)-2-aminocyclobutane-1-carboxylate

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

5-[3-({[(9H-fluoren-9-yl)methoxy]carbonyl}amino)-4,4-difluoro-N-methylbutanamido]pentanoic acid

rac-(1R,3S)-3-[3-({[(9H-fluoren-9-yl)methoxy]carbonyl}amino)-4,4-difluorobutanamido]cyclohexane-1-carboxylic acid

3-({2-[2-({[(9H-fluoren-9-yl)methoxy]carbonyl}amino)acetamido]acetamido}methyl)-2,2-difluorocyclopropane-1-carboxylic acid

3-({3-[2-({[(9H-fluoren-9-yl)methoxy]carbonyl}amino)ethoxy]propanamido}methyl)-2,2-difluorocyclopropane-1-carboxylic acid

2-({[2-({[(9H-fluoren-9-yl)methoxy]carbonyl}amino)phenyl]formamido}methyl)cyclopropane-1-carboxylic acid

1-{2-[({[(9H-fluoren-9-yl)methoxy]carbonyl}amino)methyl]cyclopropanecarbonyl}-3,3-dimethylpiperidine-2-carboxylic acid

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

(2R)-2-[(6aR)-hexahydro-2H-cyclopenta[b]furan-3a-yl]oxirane

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