8,8-Difluoro-6-azaspiro[3.4]octane

2-({[3-ethoxy-1-({[(9H-fluoren-9-yl)methoxy]carbonyl}amino)-2,2-dimethylcyclobutyl]formamido}oxy)acetic acid

3-[2-({[(9H-fluoren-9-yl)methoxy]carbonyl}amino)-4-methanesulfonylbutanamido]-2-methylpropanoic acid

2-cyclopropyl-2-{[5-({[(9H-fluoren-9-yl)methoxy]carbonyl}amino)-1H-1,2,4-triazol-3-yl]formamido}propanoic acid

4-{1-[2-({[(9H-fluoren-9-yl)methoxy]carbonyl}amino)-4-methyl-1,3-thiazol-5-yl]-N-methylformamido}butanoic acid

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

4-[N-methyl1-({[(9H-fluoren-9-yl)methoxy]carbonyl}amino)cyclopropaneamido]benzoic acid

(2S)-4-{2-[({[(9H-fluoren-9-yl)methoxy]carbonyl}amino)methyl]-4-methylpentanamido}-2-hydroxybutanoic acid

(2S)-3-({4-[({[(9H-fluoren-9-yl)methoxy]carbonyl}amino)methyl]cyclohexyl}formamido)-2-hydroxypropanoic acid

4-({[(9H-fluoren-9-yl)methoxy]carbonyl}amino)-4-[(3-methoxypropyl)carbamoyl]butanoic acid

3-[N-ethyl-4-({[(9H-fluoren-9-yl)methoxy]carbonyl}amino)but-2-enamido]-2-methylpropanoic acid