InChI=1S/C22H20O12/c1-31-18-11(25)7-13(33-22-17(28)15(26)16(27)20(34-22)21(29)30)14-10(24)6-12(32-19(14)18)8-2-4-9(23)5-3-8/h2-7,15-17,20,22-23,25-28H,1H3,(H,29,30)