2-(Hydroxymethyl)morpholin-3-one

(2R)-2-{[(1RS,5RS,6SR)-6-({[(9H-fluoren-9-yl)methoxy]carbonyl}amino)bicyclo[3.2.0]heptan-3-yl]formamido}-4-hydroxybutanoic acid

rac-2-cyclopropyl-2-{[(1R,5R,6S)-6-({[(9H-fluoren-9-yl)methoxy]carbonyl}amino)bicyclo[3.2.0]heptan-3-yl]formamido}acetic acid

3-{[4-({[(9H-fluoren-9-yl)methoxy]carbonyl}amino)-3-fluorophenyl]formamido}propanoic acid

3-cyclopropyl-3-[3-({[(9H-fluoren-9-yl)methoxy]carbonyl}amino)-2,2-difluoropropanamido]propanoic acid

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

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

4-[(2S)-2-({[(9H-fluoren-9-yl)methoxy]carbonyl}amino)propanamido]-3-methoxybutanoic acid

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

tert-butyl N-{1-[(3R)-3-aminobutyl]cyclohexyl}carbamate

4-(4,4-diethylpiperidin-1-yl)-3-({[(9H-fluoren-9-yl)methoxy]carbonyl}amino)-4-oxobutanoic acid