Methyl 3-(2,2-dibromovinyl)-4-nitrobenzoate

(2R)-2-{[2-({[(9H-fluoren-9-yl)methoxy]carbonyl}amino)spiro[3.3]heptan-2-yl]formamido}-4-hydroxybutanoic acid

1-(2-{3-[({[(9H-fluoren-9-yl)methoxy]carbonyl}amino)methyl]cyclobutyl}acetyl)pyrrolidine-3-carboxylic acid

2-(2-{3-[({[(9H-fluoren-9-yl)methoxy]carbonyl}amino)methyl]cyclobutyl}acetamido)-3,3,3-trifluoropropanoic acid

(2S)-2-{[(1rs,3rs)-3-({[(9H-fluoren-9-yl)methoxy]carbonyl}amino)cyclobutyl]formamido}hexanoic acid

(2R)-3,3-dimethyl-2-{[(1rs,3rs)-3-({[(9H-fluoren-9-yl)methoxy]carbonyl}amino)cyclobutyl]formamido}butanoic acid

3-cyclopropyl-3-[3-({[(9H-fluoren-9-yl)methoxy]carbonyl}amino)-4,4-difluorobutanamido]propanoic acid

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

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

3-[benzyl(methyl)amino]-2-[2-({[(9H-fluoren-9-yl)methoxy]carbonyl}amino)-2-methylpentanamido]propanoic acid

3-cyclopropyl-2-[3-cyclopropyl-4-({[(9H-fluoren-9-yl)methoxy]carbonyl}amino)butanamido]propanoic acid