InChI=1S/C21H20O12/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/h1-5,9,12,15-16,19,21,23-28H,6H2,(H,29,30)