2-methoxy-8,8-dimethyl-5-(4-nitrophenyl)-5,8,9,10-tetrahydropyrimido[4,5-b]quinoline-4,6(3H,7H)-dione InChI=1/C20H20N4O5/c1-20(2)8-12-15(13(25)9-20)14(10-4-6-11(7-5-10)24(27)28)16-17(21-12)22-19(29-3)23-18(16)26/h4-7,14H,8-9H2,1-3H3,(H2,21,22,23,26 pyrimido[4,5-b]quinoline-4,6(3H,7H)-dione, 5,8,9,10-tetrahydro-2-methoxy-8,8-dimethyl-5-(4-nitrophenyl)-