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