4,5-dimethoxy-6H-indolo[3,2,1-de]-1,5-naphthyridin-6-one 6H-indolo[3,2,1-de][1,5]naphthyridin-6-one, 4,5-dimethoxy- InChI=1/C16H12N2O3/c1-20-14-12-13-10(7-8-17-12)9-5-3-4-6-11(9)18(13)16(19)15(14)21-2/h3-8H,1-2H