InChI=1S/C16H26O9/c1-8(2)6-7-9(4-3-5-10(17)18)24-16-13(21)11(19)12(20)14(25-16)15(22)23/h6-9,11-14,16,19-21H,3-5H2,1-2H3,(H,17,18)(H,22,23)/b7-6+