InChI=1S/C21H20O12/c1-30-17-11(24)4-8-5-12(7-2-9(22)6-10(23)3-7)31-16(8)19(17)33-21-15(27)13(25)14(26)18(32-21)20(28)29/h2-6,13-15,18,21-27H,1H3,(H,28,29)