Hexahydrocyclopenta[c]pyrrole-1,5-dione

(2S,3S)-2-[3-({[(9H-fluoren-9-yl)methoxy]carbonyl}amino)-4,4-difluorobutanamido]-3-methylpentanoic acid

4-[3-({[(9H-fluoren-9-yl)methoxy]carbonyl}amino)oxolane-2-amido]-1-methyl-1H-pyrazole-3-carboxylic acid

4-{2-[({[(9H-fluoren-9-yl)methoxy]carbonyl}amino)methyl]pentanamido}-3,3-dimethylbutanoic acid

4-[2-({[(9H-fluoren-9-yl)methoxy]carbonyl}amino)-2-(methoxymethyl)propanamido]-3,3-dimethylbutanoic acid

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