InChI=1S/C18H24O8/c1-3-11(7-4-10-5-8-12(24-2)9-6-10)25-18-15(21)13(19)14(20)16(26-18)17(22)23/h4-9,11,13-16,18-21H,3H2,1-2H3,(H,22,23)/b7-4+