InChI=1S/C18H22O9/c1-2-3-4-11-10-7-8(5-6-9(10)17(24)26-11)25-18-14(21)12(19)13(20)15(27-18)16(22)23/h4-6,8,12-15,18-21H,2-3,7H2,1H3,(H,22,23)/b11-4+