2-(2-Methylpropyl)-6-{4-[6-(trifluoromethyl)pyridin-3-yl]piperazin-1-yl}-2,3-dihydropyridazin-3-one

1-{[(3S)-3-({[(9H-fluoren-9-yl)methoxy]carbonyl}amino)butanamido]methyl}cyclopropane-1-carboxylic acid

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

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

(2R)-2-[(3S)-3-({[(9H-fluoren-9-yl)methoxy]carbonyl}amino)butanamido]-3-(1H-imidazol-4-yl)propanoic acid

(3R)-3-{[5-({[(9H-fluoren-9-yl)methoxy]carbonyl}amino)-1,2-oxazol-3-yl]formamido}pentanoic acid

(2S)-2-hydroxy-3-{[(1rs,3rs)-3-({[(9H-fluoren-9-yl)methoxy]carbonyl}amino)cyclobutyl]formamido}propanoic acid

2-{1-[2-({[(9H-fluoren-9-yl)methoxy]carbonyl}amino)spiro[3.3]heptan-2-yl]-N-(2-hydroxyethyl)formamido}acetic acid

4-{[2-({[(9H-fluoren-9-yl)methoxy]carbonyl}amino)spiro[3.3]heptan-2-yl]formamido}-2-methylbut-2-enoic acid

2-{N-benzyl-1-[2-({[(9H-fluoren-9-yl)methoxy]carbonyl}amino)spiro[3.3]heptan-2-yl]formamido}acetic acid

2-{[2-({[(9H-fluoren-9-yl)methoxy]carbonyl}amino)spiro[3.3]heptan-2-yl]formamido}-3-hydroxy-2-methylpropanoic acid