7-[3-(1,3-benzothiazol-2-ylsulfanyl)propyl]-3-methyl-8-(4-methylpiperidin-1-yl)-2,3,6,7-tetrahydro-1H-purine-2,6-dione

(2R)-2-{[1-benzyl-3-({[(9H-fluoren-9-yl)methoxy]carbonyl}amino)pyrrolidin-3-yl]formamido}pentanoic acid

2-({[1-benzyl-3-({[(9H-fluoren-9-yl)methoxy]carbonyl}amino)pyrrolidin-3-yl]formamido}methyl)-2-methylbutanoic acid

2-[1-benzyl-3-({[(9H-fluoren-9-yl)methoxy]carbonyl}amino)pyrrolidine-3-amido]benzoic acid

4-{[1-benzyl-3-({[(9H-fluoren-9-yl)methoxy]carbonyl}amino)pyrrolidin-3-yl]formamido}-2-hydroxybutanoic acid

2-({[1-benzyl-3-({[(9H-fluoren-9-yl)methoxy]carbonyl}amino)pyrrolidin-3-yl]formamido}methyl)-1,3-thiazole-4-carboxylic acid

4-{[1-benzyl-3-({[(9H-fluoren-9-yl)methoxy]carbonyl}amino)pyrrolidin-3-yl]formamido}-2-methoxybutanoic acid

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

5-[4-({[(9H-fluoren-9-yl)methoxy]carbonyl}amino)-2-methylbut-2-enamido]-3-methyl-1,2-thiazole-4-carboxylic acid

2-[N-benzyl-2-({[(9H-fluoren-9-yl)methoxy]carbonyl}amino)-2-(methoxymethyl)butanamido]acetic acid

2-{N-benzyl-1-[2-({[(9H-fluoren-9-yl)methoxy]carbonyl}amino)-4-methyl-1,3-thiazol-5-yl]formamido}acetic acid