3-Tert-butyl-6-{[1-(pyrazin-2-yl)piperidin-4-yl]methoxy}pyridazine

2-{1-[3-({[(9H-fluoren-9-yl)methoxy]carbonyl}amino)-2,2-dimethylpropanoyl]piperidin-2-yl}acetic acid

3-{Imidazo[1,2-a]pyridin-3-yl}-2,2-dimethylpropanoic acid

4-{3-[benzyl(methyl)amino]-2-({[(9H-fluoren-9-yl)methoxy]carbonyl}amino)propanoyl}-1,4-oxazepane-6-carboxylic acid

3-[N-benzyl-3-({[(9H-fluoren-9-yl)methoxy]carbonyl}amino)-2,2-difluoropropanamido]propanoic acid

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

3-cyclopropyl-4-[2-({[(9H-fluoren-9-yl)methoxy]carbonyl}amino)-3,3-dimethylbutanamido]butanoic acid

4-[(3S)-3-({[(9H-fluoren-9-yl)methoxy]carbonyl}amino)butanamido]-3-hydroxy-3-methylbutanoic acid

3-ethyl-1-[2-({[(9H-fluoren-9-yl)methoxy]carbonyl}amino)-4-(methylsulfanyl)butanoyl]pyrrolidine-3-carboxylic acid

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

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