InChI=1S/C22H24O9/c1-28-14-10-13(9-8-12-6-4-3-5-7-12)19(15(11-14)29-2)30-22-18(25)16(23)17(24)20(31-22)21(26)27/h3-11,16-18,20,22-25H,1-2H3,(H,26,27)/b9-8+