3-(4-chlorophenyl)-8-cyano-5-methyl-7-(methylthio)-2-propylamino-pyrido[4,3-d]pyrimidin-4(3H)-one
3-(4-chlorophenyl)-8-cyano-2-butylamino-5-methyl-7-(methylthio)-pyrido[4,3-d]pyrimidin-4(3H)-one
3-(4-chlorophenyl)-2-cyclohexylamino-8-cyano-5-methyl-7-(methylthio)-pyrido[4,3-d]pyrimidin-4(3H)-one
2-(2-chlorobenzylamino)-8-cyano-5-methyl-7-(methylthio)-3-phenyl-pyrido[4,3-d]pyrimidin-4(3H)-one
8-cyano-2-(4-fluorobenzylamino)-5-methyl-7-(methylthio)-3-phenyl-pyrido[4,3-d]pyrimidin-4(3H)-one