InChI=1S/C16H26O9/c1-9(8-17)6-4-2-3-5-7-10(18)24-16-13(21)11(19)12(20)14(25-16)15(22)23/h4,6,9,11-14,16-17,19-21H,2-3,5,7-8H2,1H3,(H,22,23)/b6-4+