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