InChI=1S/C22H22O9/c1-29-14-9-6-12(7-10-14)15(23)11-8-13-4-2-3-5-16(13)30-22-19(26)17(24)18(25)20(31-22)21(27)28/h2-11,17-20,22,24-26H,1H3,(H,27,28)/b11-8+