4-{[(tert-butoxy)carbonyl]amino}-1-(2,2-difluorocyclopropyl)-1H-pyrazole-5-carboxylic acid

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

4-[(2R)-2-({[(9H-fluoren-9-yl)methoxy]carbonyl}amino)-4-methylpentanamido]-3-hydroxy-3-methylbutanoic acid

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

4-[5-({[(9H-fluoren-9-yl)methoxy]carbonyl}amino)pyridine-2-amido]cyclopent-2-ene-1-carboxylic acid

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

1-{1-[({[(9H-fluoren-9-yl)methoxy]carbonyl}amino)methyl]cyclopropanecarbonyl}-2-methylpyrrolidine-3-carboxylic acid

2-{[2-({[(9H-fluoren-9-yl)methoxy]carbonyl}amino)-5-methoxyphenyl]formamido}acetic acid

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

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

3-(1-{2-[({[(9H-fluoren-9-yl)methoxy]carbonyl}amino)methyl]cyclopentyl}-N-methylformamido)propanoic acid