1H-indene-1,3(2H)-dione, 2,2'-(1,2-hydrazinediylidenedimethanetetrayl)bis- 2,2'-(hydrazine-1,2-diylidenedimethanediylidene)bis(1H-indene-1,3(2H)-dione) InChI=1/C20H8N2O4/c23-17-11-5-1-2-6-12(11)18(24)15(17)9-21-22-10-16-19(25)13-7-3-4-8-14(13)20(16)26/h1-8