3-(3-Aminoprop-1-en-2-yl)-4-nitrophenol

2-{1-[2-({[(9H-fluoren-9-yl)methoxy]carbonyl}amino)hex-5-enamido]cyclobutyl}acetic acid

1-{2-ethyl-2-[({[(9H-fluoren-9-yl)methoxy]carbonyl}amino)methyl]butanoyl}piperidine-2-carboxylic acid

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

2-{1-[5-({[(9H-fluoren-9-yl)methoxy]carbonyl}amino)-2-methylpentanoyl]piperidin-4-yl}acetic acid

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

(2S)-2-[(2S)-3-(benzyl carboxy)-2-({[(9H-fluoren-9-yl)methoxy]carbonyl}amino)propanamido]-3,3-dimethylbutanoic acid

rac-(2R,3S)-3-[2-({[(9H-fluoren-9-yl)methoxy]carbonyl}amino)butanamido]oxolane-2-carboxylic acid

rac-(2R,3S)-3-{3-[2-({[(9H-fluoren-9-yl)methoxy]carbonyl}amino)ethoxy]propanamido}oxolane-2-carboxylic acid

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

(2RS,3SR)-3-[(2S)-2-({[(9H-fluoren-9-yl)methoxy]carbonyl}amino)-4-(methylsulfanyl)butanamido]oxolane-2-carboxylic acid