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