4-(2-{4-[Bis(2-hydroxyethyl)amino]phenyl}ethenyl)-1-butylpyridinium tetraphenylborate

(2R)-2-[(4S)-4-({[(9H-fluoren-9-yl)methoxy]carbonyl}amino)-5,5,5-trifluoropentanamido]butanoic acid

3-[(2S)-2-({[(9H-fluoren-9-yl)methoxy]carbonyl}amino)-3-methoxypropanamido]-2-(propan-2-yl)butanoic acid

2-{[(2S,3R)-2-({[(9H-fluoren-9-yl)methoxy]carbonyl}amino)-3-methoxybutanamido]methyl}cyclopentane-1-carboxylic acid

4-{[4-({[(9H-fluoren-9-yl)methoxy]carbonyl}amino)-3-fluorophenyl]formamido}-3-hydroxybutanoic acid

2-{2-[1-({[(9H-fluoren-9-yl)methoxy]carbonyl}amino)cyclopropyl]acetyl}-octahydrocyclopenta[c]pyrrole-1-carboxylic acid

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

2-({2-[1-({[(9H-fluoren-9-yl)methoxy]carbonyl}amino)cyclopropyl]acetamido}methyl)-4,4-dimethylpentanoic acid

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

2-[(2R)-2-({[(9H-fluoren-9-yl)methoxy]carbonyl}amino)butanoyl]-2-azabicyclo[2.2.2]octane-6-carboxylic acid

2-{2-[({[(9H-fluoren-9-yl)methoxy]carbonyl}amino)methyl]butanoyl}-2-azabicyclo[2.2.2]octane-6-carboxylic acid