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

3-[(2R)-2-({[(9H-fluoren-9-yl)methoxy]carbonyl}amino)-3,3-dimethylbutanamido]-2-methoxypropanoic acid

rac-(1R,3S)-3-[3-cyclopropyl-2-({[(9H-fluoren-9-yl)methoxy]carbonyl}amino)propanamido]cyclopentane-1-carboxylic acid

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

(2S)-1-[(2S)-2-({[(9H-fluoren-9-yl)methoxy]carbonyl}amino)-3-methylbutanoyl]piperidine-2-carboxylic acid

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

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

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

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

4-[(1-cyclopentyl-2-hydroxyethyl)carbamoyl]-4-({[(9H-fluoren-9-yl)methoxy]carbonyl}amino)butanoic acid

2-cyclopropyl-2-({1-[({[(9H-fluoren-9-yl)methoxy]carbonyl}amino)methyl]cyclobutyl}formamido)acetic acid