3-(2-Methylanilino)-1,2,4-triazinan-5-one

rac-3-{[(1R,3S)-3-[({[(9H-fluoren-9-yl)methoxy]carbonyl}amino)methyl]-2,2-difluorocyclopropyl]formamido}-4-methylpentanoic acid

1-[4-({[(9H-fluoren-9-yl)methoxy]carbonyl}amino)-3-hydroxybutanoyl]-4,4-difluoropiperidine-3-carboxylic acid

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

(2S)-4-{2-[3-({[(9H-fluoren-9-yl)methoxy]carbonyl}amino)cyclobutyl]acetamido}-2-hydroxybutanoic acid

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

3-({[(9H-fluoren-9-yl)methoxy]carbonyl}amino)-3-[(2-methoxypropyl)(propan-2-yl)carbamoyl]propanoic acid

4-[(cyclopropylmethyl)(2,2-difluoroethyl)carbamoyl]-4-({[(9H-fluoren-9-yl)methoxy]carbonyl}amino)butanoic acid

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

2-{2-[({[(9H-fluoren-9-yl)methoxy]carbonyl}amino)methyl]-N,3-dimethylbutanamido}acetic acid

(2S,3R)-3-(benzyloxy)-2-[(2S)-2-({[(9H-fluoren-9-yl)methoxy]carbonyl}amino)propanamido]butanoic acid