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