InChI=1S/C21H20O12/c1-6-3-8(22)12-9(23)4-7-5-10(30-2)17(13(24)11(7)18(12)31-6)32-21-16(27)14(25)15(26)19(33-21)20(28)29/h3-5,14-16,19,21,23-27H,1-2H3,(H,28,29)