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