2-(1-{2-[({[(9H-fluoren-9-yl)methoxy]carbonyl}amino)methyl]-4-methyl-1,3-thiazol-5-yl}-N-propylformamido)acetic acid

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

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

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

rac-(1R,2S)-2-[4-({[(9H-fluoren-9-yl)methoxy]carbonyl}amino)-2-methylbutanamido]cyclohexane-1-carboxylic acid

rac-(1R,2S)-2-[4-({[(9H-fluoren-9-yl)methoxy]carbonyl}amino)-3-methylbutanamido]cyclohexane-1-carboxylic acid

rac-(1R,2S)-2-[4-({[(9H-fluoren-9-yl)methoxy]carbonyl}amino)-3-hydroxybutanamido]cyclohexane-1-carboxylic acid

rac-(1R,2S)-2-{3-[benzyl(methyl)amino]-2-({[(9H-fluoren-9-yl)methoxy]carbonyl}amino)propanamido}cyclohexane-1-carboxylic acid

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

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

rac-3-[(1R,2S)-2-({[(9H-fluoren-9-yl)methoxy]carbonyl}amino)cyclohexanecarbonyl]-1,3-thiazolidine-4-carboxylic acid