6-benzyl-4-chloro-5H,6H,7H,8H-pyrido[4,3-d]pyrimidine hydrochloride

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

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

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

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

(2R)-2-{[3-bromo-5-({[(9H-fluoren-9-yl)methoxy]carbonyl}amino)phenyl]formamido}-4-hydroxybutanoic acid

(2R)-2-(2-{4-[({[(9H-fluoren-9-yl)methoxy]carbonyl}amino)methyl]-1H-1,2,3-triazol-1-yl}acetamido)-4-hydroxybutanoic acid

(2S)-2-{2-[({[(9H-fluoren-9-yl)methoxy]carbonyl}amino)methyl]-3-methylbutanamido}-3-methylpentanoic acid

4-({[(9H-fluoren-9-yl)methoxy]carbonyl}amino)-4-[(2-methanesulfonylethyl)(methyl)carbamoyl]butanoic acid

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

2-cyclopropyl-2-{2-[1-({[(9H-fluoren-9-yl)methoxy]carbonyl}amino)cyclobutyl]acetamido}propanoic acid