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