4,4,5,5-Tetrafluoropentanal

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

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

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

1-[2-({[(9H-fluoren-9-yl)methoxy]carbonyl}amino)-3-methoxy-2-methylpropanoyl]-3,3-dimethylpyrrolidine-2-carboxylic acid

(3RS,4RS)-1-[(2S)-3-(dimethylamino)-2-({[(9H-fluoren-9-yl)methoxy]carbonyl}amino)propanoyl]-3,4-dimethylpyrrolidine-3-carboxylic acid

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

1-[(2S)-3-(dimethylamino)-2-({[(9H-fluoren-9-yl)methoxy]carbonyl}amino)propanoyl]-4-methylpyrrolidine-3-carboxylic acid

(2R)-1-{5-[({[(9H-fluoren-9-yl)methoxy]carbonyl}amino)methyl]furan-2-carbonyl}-2-methylpyrrolidine-2-carboxylic acid

rac-2-[(1R,3S)-3-[4-({[(9H-fluoren-9-yl)methoxy]carbonyl}amino)-3-methoxybutanamido]cyclopentyl]acetic acid

2-[(1RS,3SR)-3-[(2S)-2-({[(9H-fluoren-9-yl)methoxy]carbonyl}amino)-4-(methylsulfanyl)butanamido]cyclopentyl]acetic acid