InChI=1S/C22H22O9/c1-29-13-8-9-14(15(23)10-7-12-5-3-2-4-6-12)16(11-13)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)/b10-7+