InChI=1S/C16H26O7/c1-9(2)5-4-6-10(3)7-8-22-16-13(19)11(17)12(18)14(23-16)15(20)21/h5,7,11-14,16-19H,4,6,8H2,1-3H3,(H,20,21)/b10-7+