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