3-hydroxy-2-[N-(1-hydroxybutan-2-yl)-C-methylcarbonimidoyl]cyclohex-2-en-1-one

rac-(3R,4S)-4-{1-[(tert-butoxy)carbonyl]piperidin-4-yl}oxane-3-carboxylic acid

rac-3-[(1R,5R,6S)-6-({[(9H-fluoren-9-yl)methoxy]carbonyl}amino)bicyclo[3.2.0]heptane-3-carbonyl]-1,3-thiazolidine-4-carboxylic acid

2-({1-[(Benzyloxy)carbonyl]piperidin-3-yl}methyl)-1,3-thiazole-4-carboxylic acid

2-{5-[({[(9H-fluoren-9-yl)methoxy]carbonyl}amino)methyl]-1,3-oxazole-4-carbonyl}-5-oxopyrazolidine-3-carboxylic acid

2-[1-benzyl-3-({[(9H-fluoren-9-yl)methoxy]carbonyl}amino)pyrrolidine-3-carbonyl]-5-oxopyrazolidine-3-carboxylic acid

rac-4-{[(1R,2S)-2-({[(9H-fluoren-9-yl)methoxy]carbonyl}amino)cyclohexyl]formamido}pentanoic acid

4-({[(9H-fluoren-9-yl)methoxy]carbonyl}amino)-2-(propan-2-yloxy)benzoic acid

6-bromo-8-{[(tert-butoxy)carbonyl]amino}-4-oxo-4H-chromene-2-carboxylic acid

8-{[(benzyloxy)carbonyl]amino}-6-bromo-4-oxo-4H-chromene-2-carboxylic acid

2-{2-ethyl-2-[({[(9H-fluoren-9-yl)methoxy]carbonyl}amino)methyl]-N-(2-methoxyethyl)butanamido}acetic acid