35350-43-7 InChI=1/C12H8N2O4Se2/c15-13(16)9-5-1-3-7-11(9)19-20-12-8-4-2-6-10(12)14(17)18/h1-8 bis(2-nitrophenyl)diselane diselane, bis(2-nitrophenyl)-