InChI=1S/C22H24O9/c1-28-15-9-13(10-16(11-15)29-2)7-6-12-4-3-5-14(8-12)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)/b7-6+