InChI=1S/C17H28O8/c1-2-3-4-5-6-8-11(9-7-10-18)24-17-14(21)12(19)13(20)15(25-17)16(22)23/h7,9-15,17,19-21H,2-6,8H2,1H3,(H,22,23)/b9-7+