Tert-butyl 2-{1-oxa-8-azaspiro[4.5]decan-3-yl}acetate

2-{[5-cyano-2-({[(9H-fluoren-9-yl)methoxy]carbonyl}amino)pentanamido]methyl}-3-methylbutanoic acid

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

(3RS,4RS)-1-[(3R)-3-({[(9H-fluoren-9-yl)methoxy]carbonyl}amino)pentanoyl]-4-methylpyrrolidine-3-carboxylic acid

3-[(3R)-3-({[(9H-fluoren-9-yl)methoxy]carbonyl}amino)pentanamido]-2-fluorobenzoic acid

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

(1rs,3rs)-3-[(4S)-4-({[(9H-fluoren-9-yl)methoxy]carbonyl}amino)-5,5,5-trifluoropentanamido]cyclobutane-1-carboxylic acid

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

4-{[1-benzyl-4-({[(9H-fluoren-9-yl)methoxy]carbonyl}amino)piperidin-4-yl]formamido}hexanoic acid

rac-(1R,3S)-3-[4-({[(9H-fluoren-9-yl)methoxy]carbonyl}amino)butanamido]cyclohexane-1-carboxylic acid

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