InChI=1S/C22H24O8/c1-28-15-10-8-14(9-11-15)16(12-7-13-5-3-2-4-6-13)29-22-19(25)17(23)18(24)20(30-22)21(26)27/h2-12,16-20,22-25H,1H3,(H,26,27)/b12-7+