InChI=1S/C22H24O9/c1-28-14-9-12(10-15(11-14)29-2)7-8-13-5-3-4-6-16(13)30-22-19(25)17(23)18(24)20(31-22)21(26)27/h3-11,17-20,22-25H,1-2H3,(H,26,27)/b8-7+