(2R)-2-[(2R,3S)-3-(benzyloxy)-2-({[(9H-fluoren-9-yl)methoxy]carbonyl}amino)butanamido]-4-methylpentanoic acid

Methyl 3-hydroxy-2-[1-(2-methylpropyl)piperidin-4-yl]propanoate

rac-(3aR,7aR)-2-[2-({[(9H-fluoren-9-yl)methoxy]carbonyl}amino)acetyl]-octahydropyrano[3,4-c]pyrrole-7a-carboxylic acid

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

(3aRS,7aRS)-2-[(2R)-2-({[(9H-fluoren-9-yl)methoxy]carbonyl}amino)propanoyl]-octahydropyrano[3,4-c]pyrrole-7a-carboxylic acid

rac-(3aR,7aR)-2-[4-({[(9H-fluoren-9-yl)methoxy]carbonyl}amino)butanoyl]-octahydropyrano[3,4-c]pyrrole-7a-carboxylic acid

rac-(3aR,7aR)-2-[4-({[(9H-fluoren-9-yl)methoxy]carbonyl}amino)but-2-ynoyl]-octahydropyrano[3,4-c]pyrrole-7a-carboxylic acid

4-{2,2-difluoro-6-azabicyclo[3.2.1]octan-6-yl}-3-({[(9H-fluoren-9-yl)methoxy]carbonyl}amino)-4-oxobutanoic acid

4-({[(9H-fluoren-9-yl)methoxy]carbonyl}amino)-4-{[(1,3,3-trimethylcyclobutyl)methyl]carbamoyl}butanoic acid

3-({[(9H-fluoren-9-yl)methoxy]carbonyl}amino)-3-[methyl(1,3-thiazol-2-yl)carbamoyl]propanoic acid

rac-2-({1-[(1R,2S)-2-({[(9H-fluoren-9-yl)methoxy]carbonyl}amino)cyclohexyl]-N-methylformamido}oxy)acetic acid