(5-Ethyl-4H-1,2,4-triazol-3-yl)acetic acid

4-{[5-({[(9H-fluoren-9-yl)methoxy]carbonyl}amino)pyridin-2-yl]formamido}-4-methylpentanoic acid

2-{[(2R)-2-({[(9H-fluoren-9-yl)methoxy]carbonyl}amino)-3,3-dimethylbutanamido]methyl}-1,3-thiazole-4-carboxylic acid

3-[({1-[({[(9H-fluoren-9-yl)methoxy]carbonyl}amino)methyl]cyclopentyl}formamido)methyl]pentanoic acid

4-chloro-3-[2-({[(9H-fluoren-9-yl)methoxy]carbonyl}amino)pent-4-ynamido]benzoic acid

2-(2-{[3-({[(9H-fluoren-9-yl)methoxy]carbonyl}amino)butanamido]methyl}phenyl)acetic acid

1-{2-[({[(9H-fluoren-9-yl)methoxy]carbonyl}amino)methyl]-4,4-dimethylpentanamido}cyclobutane-1-carboxylic acid

2-[2-({[(9H-fluoren-9-yl)methoxy]carbonyl}amino)acetamido]pentanoic acid

2-[2-cyclopropyl-2-({[(9H-fluoren-9-yl)methoxy]carbonyl}amino)propanamido]acetic acid

3-[(but-3-yn-1-yl)carbamoyl]-3-({[(9H-fluoren-9-yl)methoxy]carbonyl}amino)propanoic acid

3-[3-({[(9H-fluoren-9-yl)methoxy]carbonyl}amino)propanamido]-2-methoxypropanoic acid