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