3-({[(9H-fluoren-9-yl)methoxy]carbonyl}amino)-3-{methyl[2-(pyridin-2-yl)ethyl]carbamoyl}propanoic acid

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

(2R)-2-{[(3RS,5RS)-5-[({[(9H-fluoren-9-yl)methoxy]carbonyl}amino)methyl]oxolan-3-yl]formamido}-4-methylpentanoic acid

rac-1-benzyl-3-[(3R,5R)-5-[({[(9H-fluoren-9-yl)methoxy]carbonyl}amino)methyl]oxolane-3-amido]pyrrolidine-3-carboxylic acid

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

5-{[4-({[(9H-fluoren-9-yl)methoxy]carbonyl}amino)-3-hydroxybutanamido]methyl}oxolane-3-carboxylic acid

5-{[3-(dimethylamino)-2-({[(9H-fluoren-9-yl)methoxy]carbonyl}amino)propanamido]methyl}oxolane-3-carboxylic acid

2-[4-({[(9H-fluoren-9-yl)methoxy]carbonyl}amino)but-2-ynoyl]-octahydrocyclopenta[c]pyrrole-1-carboxylic acid

4-{2-[1-({[(9H-fluoren-9-yl)methoxy]carbonyl}amino)cyclobutyl]acetamido}but-2-ynoic acid

4-[6-({[(9H-fluoren-9-yl)methoxy]carbonyl}amino)hexanamido]but-2-ynoic acid

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