InChI=1S/C30H26O13/c31-13-24-27(38)29(43-25(37)8-2-14-1-7-18(33)19(34)9-14)28(39)30(42-24)40-17-10-20(35)26-21(36)12-22(41-23(26)11-17)15-3-5-16(32)6-4-15/h1-12,24,27-35,38-39H,13H2/b8-2+