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