5-[N-ethyl-4-({[(9H-fluoren-9-yl)methoxy]carbonyl}amino)-3,3-dimethylbutanamido]pentanoic acid

2-[1,3-dimethyl-7-(m-tolyl)-2,4-dioxo-pyrimido[4,5-d]pyrimidin-5-yl]sulfanyl-N-(4-ethoxyphenyl)acetamide

2-[1,3-dimethyl-2,4-dioxo-7-(p-tolyl)pyrimido[4,5-d]pyrimidin-5-yl]sulfanyl-N-methyl-N-phenyl-acetamide

2-[1,3-dimethyl-2,4-dioxo-7-(p-tolyl)pyrimido[4,5-d]pyrimidin-5-yl]sulfanyl-N-(2-phenylethyl)acetamide

2-[7-(4-chlorophenyl)-1,3-dimethyl-2,4-dioxo-pyrimido[4,5-d]pyrimidin-5-yl]sulfanyl-N-(2-methoxyethyl)acetamide

2-[7-(4-chlorophenyl)-1,3-dimethyl-2,4-dioxo-pyrimido[4,5-d]pyrimidin-5-yl]sulfanyl-N-methyl-N-phenyl-acetamide

2-[7-(4-chlorophenyl)-1,3-dimethyl-2,4-dioxo-pyrimido[4,5-d]pyrimidin-5-yl]sulfanyl-N-(2-furylmethyl)acetamide

2-[7-(4-chlorophenyl)-1,3-dimethyl-2,4-dioxo-pyrimido[4,5-d]pyrimidin-5-yl]sulfanyl-N-thiazol-2-yl-acetamide

2-[7-(4-chlorophenyl)-1,3-dimethyl-2,4-dioxo-pyrimido[4,5-d]pyrimidin-5-yl]sulfanyl-N-(5-methylisoxazol-3-yl)acetamide

ethyl 4-[7-(4-chlorophenyl)-1,3-dimethyl-2,4-dioxo-pyrimido[4,5-d]pyrimidin-5-yl]sulfanyl-3-oxo-butanoate

2-[7-(3-chlorophenyl)-1,3-dimethyl-2,4-dioxo-pyrimido[4,5-d]pyrimidin-5-yl]sulfanyl-N-(2-methoxyethyl)acetamide