InChI=1S/C22H14O12/c1-31-19(27)11-5-7-3-9(23)15(17(25)13(7)21(29)33-11)16-10(24)4-8-6-12(20(28)32-2)34-22(30)14(8)18(16)26/h3-6,23-26H,1-2H3