(2S)-3-[2-({[(9H-fluoren-9-yl)methoxy]carbonyl}amino)-2-phenylacetamido]-2-hydroxypropanoic acid

1-[(3S)-3-({[(9H-fluoren-9-yl)methoxy]carbonyl}amino)pentanoyl]-4-hydroxypiperidine-4-carboxylic acid

2-[(2S)-3-cyclopropyl-2-({[(9H-fluoren-9-yl)methoxy]carbonyl}amino)-N-(propan-2-yl)propanamido]acetic acid

2-{4-[(3R)-3-({[(9H-fluoren-9-yl)methoxy]carbonyl}amino)hexanoyl]morpholin-3-yl}acetic acid

4-[(3R)-3-({[(9H-fluoren-9-yl)methoxy]carbonyl}amino)hexanamido]oxane-4-carboxylic acid

3-{1-[3-(dimethylamino)-2-({[(9H-fluoren-9-yl)methoxy]carbonyl}amino)propanoyl]pyrrolidin-3-yl}propanoic acid

2-[N-(2,2-dimethylpropyl)-2-[({[(9H-fluoren-9-yl)methoxy]carbonyl}amino)methyl]-3-methylbutanamido]acetic acid

1-benzyl-4-[3-(benzyloxy)-2-({[(9H-fluoren-9-yl)methoxy]carbonyl}amino)butanamido]piperidine-4-carboxylic acid

(2S,3R)-3-(benzyloxy)-2-({1-[({[(9H-fluoren-9-yl)methoxy]carbonyl}amino)methyl]cyclopentyl}formamido)butanoic acid

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

(2R)-2-{[(1RS,2SR)-2-({[(9H-fluoren-9-yl)methoxy]carbonyl}amino)cycloheptyl]formamido}pentanoic acid