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

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

methyl 4-chloro-3-(8-methyl-2-(methylthio)-5-oxopyrido[4,3-d]pyrimidin-6(5H)-yl)benzoate

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

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