InChI=1S/C21H18O12/c22-8-6-9(7-4-2-1-3-5-7)31-17-10(8)18(14(26)11(23)13(17)25)32-21-16(28)12(24)15(27)19(33-21)20(29)30/h1-6,12,15-16,19,21,23-28H,(H,29,30)