InChI=1S/C21H20O12/c1-30-14-6-12-7(2-10(14)23)3-13(31-12)9-4-8(22)5-11(24)18(9)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)