4-[4-(Pyrrolidin-1-yl)phenyl]butan-2-one

(2S)-3-{[3-({[(9H-fluoren-9-yl)methoxy]carbonyl}amino)-5-fluorophenyl]formamido}-2-hydroxypropanoic acid

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

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

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

2-({3-[({[(9H-fluoren-9-yl)methoxy]carbonyl}amino)methyl]-5-methylhexanamido}oxy)propanoic acid

3-{[2-({[(9H-fluoren-9-yl)methoxy]carbonyl}amino)-3-methoxypropanamido]methyl}oxane-3-carboxylic acid

3-{[3-({[(9H-fluoren-9-yl)methoxy]carbonyl}amino)-2-methoxypropanamido]methyl}oxane-3-carboxylic acid

2-(2-{[3-({[(9H-fluoren-9-yl)methoxy]carbonyl}amino)bicyclo[3.1.0]hexan-1-yl]formamido}acetamido)acetic acid

1-[2-({[(9H-fluoren-9-yl)methoxy]carbonyl}amino)-1,3-thiazole-5-carbonyl]-1,2,3,6-tetrahydropyridine-4-carboxylic acid

1-{N-methyl2-[({[(9H-fluoren-9-yl)methoxy]carbonyl}amino)methyl]-4-methyl-1,3-thiazole-5-amido}cyclopropane-1-carboxylic acid