1-(4-Aminophenyl)-4-(pyridin-3-yl)piperazin-2-one

3-({[(9H-fluoren-9-yl)methoxy]carbonyl}amino)-3-{methyl[1-(1-methylcyclopropyl)ethyl]carbamoyl}propanoic acid

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

2-{1-[4-({[(9H-fluoren-9-yl)methoxy]carbonyl}amino)-2,2-dimethylbutanoyl]piperidin-3-yl}acetic acid

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

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

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

2-{1-[2-cyclopropyl-2-({[(9H-fluoren-9-yl)methoxy]carbonyl}amino)propanoyl]piperidin-4-yl}acetic acid

1-{2-[2-({[(9H-fluoren-9-yl)methoxy]carbonyl}amino)ethoxy]acetyl}-4-hydroxypiperidine-4-carboxylic acid

2-[N-(cyclopropylmethyl)-3-({[(9H-fluoren-9-yl)methoxy]carbonyl}amino)-2,2-dimethylpropanamido]acetic acid

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