(4-((4-Chlorophenyl)sulfonyl)-1-oxa-4,8-diazaspiro[4.5]decan-8-yl)(3-methyl-4-nitrophenyl)methanone

2-{[1-benzyl-3-({[(9H-fluoren-9-yl)methoxy]carbonyl}amino)pyrrolidin-3-yl]formamido}-3,3-dimethylbutanoic acid

2-{4-[1-benzyl-3-({[(9H-fluoren-9-yl)methoxy]carbonyl}amino)pyrrolidine-3-carbonyl]morpholin-2-yl}acetic acid

4-[1-benzyl-3-({[(9H-fluoren-9-yl)methoxy]carbonyl}amino)pyrrolidine-3-carbonyl]-2-methylmorpholine-3-carboxylic acid

4-[1-benzyl-3-({[(9H-fluoren-9-yl)methoxy]carbonyl}amino)pyrrolidine-3-amido]oxane-4-carboxylic acid

3-{1-[1-benzyl-3-({[(9H-fluoren-9-yl)methoxy]carbonyl}amino)pyrrolidin-3-yl]-N-tert-butylformamido}propanoic acid

2-[N-tert-butyl-3-(dimethylamino)-2-({[(9H-fluoren-9-yl)methoxy]carbonyl}amino)propanamido]acetic acid

3-{3-[benzyl(methyl)amino]-2-({[(9H-fluoren-9-yl)methoxy]carbonyl}amino)-N-methylpropanamido}oxolane-3-carboxylic acid

3-[4-({[(9H-fluoren-9-yl)methoxy]carbonyl}amino)-3-hydroxybutanamido]-4-fluorobenzoic acid

(2S)-2-[4-({[(9H-fluoren-9-yl)methoxy]carbonyl}amino)-3-hydroxybutanamido]hexanoic acid

3-[4-({[(9H-fluoren-9-yl)methoxy]carbonyl}amino)-3-hydroxybutanamido]-4-methylpentanoic acid