InChI=1S/C22H22O9/c1-29-14-9-5-13(6-10-14)16(23)11-4-12-2-7-15(8-3-12)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)/b11-4+