InChI=1/C22H24O9/c1-28-15-9-13(10-16(11-15)29-2)4-3-12-5-7-14(8-6-12)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)/b4-3+