6-(2,6-dichlorophenyl)-8-(hydroxymethyl)-2-{[4-(4-methylpiperazin-1-yl)phenyl]amino}pyrido[4,3-d]pyrimidin-5(6H)-one

8-(1,3-benzothiazol-2-yl)-6-(2,6-dichlorophenyl)-2-{[4-(4-methylpiperazin-1-yl)phenyl]amino}pyrido[4,3-d]pyrimidin-5(6H)-one

8-(1H-benzimidazol-2-yl)-6-(2,6-dichlorophenyl)-2-{[4-(4-methylpiperazin-1-yl)phenyl]amino}pyrido[4,3-d]pyrimidin-5(6H)-one