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The title compound 12-(2,4-dichlorophenyl)-7,8,9,10,11,12-hexahydrobenzo-[f]pyrimido[4,5-b]quinoline-9,11-dione DMF solvate 1(C24H20Cl2N4O3,Mr=483.34) was synthesized and crystallized.The crystal belongs to the monoclinic system,space group P21/n with a=6