6-(3,5-dimethyl-1H-pyrazol-4-yl)-8-methyl-2-(methylthio)pyrido[4,3-d]pyrimidin-5(6H)-one

6-(3,5-dimethylisoxazol-4-yl)-8-methyl-2-(methylthio)pyrido[4,3-d]pyrimidin-5(6H)-one

6-(2,6-dimethylphenyl)-8-methyl-2-[(2'-methyl-2',3'-dihydro-1'H-spiro[cyclopropane-1,4'-isoquinolin]-7'-yl)amino]pyrido[4,3-d]pyrimidin-5(6H)-one

2-({4-[4-(dimethylamino)piperidin-1-yl]phenyl}amino)-6-(2,6-dimethylphenyl)-8-methylpyrido[4,3-d]pyrimidin-5(6H)-one

6-(2,6-dimethylphenyl)-8-methyl-2-(methylthio)pyrido[4,3-d]pyrimidin-5(6H)-one