(3R)-3-(5-{[(tert-butoxy)carbonyl]amino}-2-hydroxyphenyl)-3-hydroxypropanoic acid

2-[(2S)-2-({[(9H-fluoren-9-yl)methoxy]carbonyl}amino)butanamido]-2-phenylacetic acid

2-({1-[(2S)-2-({[(9H-fluoren-9-yl)methoxy]carbonyl}amino)butanoyl]piperidin-4-yl}oxy)acetic acid

rac-(2R,3R)-1-[5-({[(9H-fluoren-9-yl)methoxy]carbonyl}amino)-3-methylpentanoyl]-2-methylpiperidine-3-carboxylic acid

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

5-[(2R)-2-({[(9H-fluoren-9-yl)methoxy]carbonyl}amino)-4-(methylsulfanyl)butanamido]-3-methyl-1,2-thiazole-4-carboxylic acid

3-{[3-({[(9H-fluoren-9-yl)methoxy]carbonyl}amino)-2-methoxypropanamido]methyl}-5-methylhexanoic acid

3-{[(4-cyanophenyl)methyl]carbamoyl}-3-({[(9H-fluoren-9-yl)methoxy]carbonyl}amino)propanoic acid

1-{2-[({[(9H-fluoren-9-yl)methoxy]carbonyl}amino)methyl]-2-methylbutanoyl}azepane-2-carboxylic acid

4-[2-({[(9H-fluoren-9-yl)methoxy]carbonyl}amino)-2-(thiophen-2-yl)acetamido]cyclopent-2-ene-1-carboxylic acid

2-{N-ethyl-1-[3-({[(9H-fluoren-9-yl)methoxy]carbonyl}amino)pyridin-2-yl]formamido}-2-methylpropanoic acid