InChI=1S/C21H22O11/c1-30-14-5-3-9(6-12(14)23)2-4-10-7-11(22)8-13(24)18(10)31-21-17(27)15(25)16(26)19(32-21)20(28)29/h2-8,15-17,19,21-27H,1H3,(H,28,29)/b4-2+