InChI=1S/C17H28O4/c1-13-6-5-10-16(3,19)11-9-15(8-7-13)17(4,20)12-21-14(2)18/h6,9,11,15,19-20H,5,7-8,10,12H2,1-4H3/b11-9+,13-6-/t15-,16-,17?/m1/s1