InChI=1S/C16H26O8/c1-8(2)6-10(7-9(3)4-5-17)23-16-13(20)11(18)12(19)14(24-16)15(21)22/h4,6,10-14,16-20H,5,7H2,1-3H3,(H,21,22)/b9-4-