4-methyl-1-(2-methyl-5-oxocyclohexyl)-4,5-dihydro-1H-1,2,4-triazol-5-one

2-[(2-{1-[({[(9H-fluoren-9-yl)methoxy]carbonyl}amino)methyl]cyclobutyl}acetamido)methyl]pentanoic acid

3-({[(9H-fluoren-9-yl)methoxy]carbonyl}amino)-4-[3-methyl-3-(methylcarbamoyl)pyrrolidin-1-yl]-4-oxobutanoic acid

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

4-({[(9H-fluoren-9-yl)methoxy]carbonyl}amino)-4-{[(2-oxo-2,3-dihydro-1H-imidazol-4-yl)methyl]carbamoyl}butanoic acid

4-({[(9H-fluoren-9-yl)methoxy]carbonyl}amino)-4-{[2-(2H-1,2,3,4-tetrazol-2-yl)ethyl]carbamoyl}butanoic acid

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

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

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

4-{8-azabicyclo[3.2.1]octan-8-yl}-3-({[(9H-fluoren-9-yl)methoxy]carbonyl}amino)-4-oxobutanoic acid

(2S)-2-{[5-({[(9H-fluoren-9-yl)methoxy]carbonyl}amino)pyridin-2-yl]formamido}-3-methylbutanoic acid