2-{[2-(4-bromophenyl)-7-{[(9H-fluoren-9-yl)methoxy]carbonyl}-7-azaspiro[3.5]nonan-2-yl]oxy}acetic acid

3-[N-ethyl-3-({[(9H-fluoren-9-yl)methoxy]carbonyl}amino)-3-methylbutanamido]butanoic acid

rac-(1R,2R,4S)-7-[3-(benzyloxy)-2-({[(9H-fluoren-9-yl)methoxy]carbonyl}amino)butanoyl]-7-azabicyclo[2.2.1]heptane-2-carboxylic acid

2-(3-{[3-({[(9H-fluoren-9-yl)methoxy]carbonyl}amino)-4-methylpentanamido]methyl}cyclobutyl)acetic acid

1-[4-({[(9H-fluoren-9-yl)methoxy]carbonyl}amino)hexanoyl]-2-methylpiperidine-2-carboxylic acid

2-[4-({[(9H-fluoren-9-yl)methoxy]carbonyl}amino)hexanamido]-1-methylcyclopentane-1-carboxylic acid

2-{N-ethyl-2-[({[(9H-fluoren-9-yl)methoxy]carbonyl}amino)methyl]butanamido}-2-methylpropanoic acid

(2S)-2-{2-[1-({[(9H-fluoren-9-yl)methoxy]carbonyl}amino)cyclopentyl]acetamido}butanoic acid

5-(2-{[2-({[(9H-fluoren-9-yl)methoxy]carbonyl}amino)ethyl]sulfanyl}acetamido)pentanoic acid

5-[(2R)-2-({[(9H-fluoren-9-yl)methoxy]carbonyl}amino)butanamido]-3-methylpentanoic acid

(2S)-2-[3-({[(9H-fluoren-9-yl)methoxy]carbonyl}amino)-N-methylhexanamido]propanoic acid