3-(1,3-Oxazol-4-yl)prop-2-ynoic acid

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

(2S,3R)-2-{2-[(1RS,2SR)-2-({[(9H-fluoren-9-yl)methoxy]carbonyl}amino)cyclopentyl]acetamido}-3-hydroxybutanoic acid

2-[3-cyclopropyl-3-({[(9H-fluoren-9-yl)methoxy]carbonyl}amino)propanoyl]-2-azabicyclo[2.1.1]hexane-1-carboxylic acid

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

2-{N-[2-(dimethylamino)ethyl]-2-({[(9H-fluoren-9-yl)methoxy]carbonyl}amino)acetamido}acetic acid

4-[3-({[(9H-fluoren-9-yl)methoxy]carbonyl}amino)-N,4,4-trimethylpentanamido]butanoic acid

(2R)-2-{[2-({[(9H-fluoren-9-yl)methoxy]carbonyl}amino)-5-methylphenyl]formamido}pentanoic acid

1-{2-[2-({[(9H-fluoren-9-yl)methoxy]carbonyl}amino)pent-4-enamido]ethyl}-1H-imidazole-4-carboxylic acid

(2R)-2-{[4-({[(9H-fluoren-9-yl)methoxy]carbonyl}amino)-3-fluorophenyl]formamido}pentanoic acid

2-({[6-({[(9H-fluoren-9-yl)methoxy]carbonyl}amino)pyridin-2-yl]formamido}methyl)-2-methylbutanoic acid