InChI=1S/C21H18O12/c22-8-6-9-10(11(23)14(26)17(31-9)7-4-2-1-3-5-7)12(24)18(8)32-21-16(28)13(25)15(27)19(33-21)20(29)30/h1-6,13,15-16,19,21-22,24-28H,(H,29,30)