InChI=1S/C21H22O11/c1-30-14-5-4-9(6-11(14)22)2-3-10-7-12(23)18(13(24)8-10)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)/b3-2+