InChI=1S/C21H22O11/c1-30-13-5-4-9(6-11(13)22)2-3-10-7-12(23)15(24)14(8-10)31-21-18(27)16(25)17(26)19(32-21)20(28)29/h2-8,16-19,21-27H,1H3,(H,28,29)/b3-2+