InChI=1S/C16H26O4/c1-2-3-4-5-6-7-10-14(17)11-8-9-12-15(18)13-16(19)20/h6-8,11,14,17H,2-5,9-10,12-13H2,1H3,(H,19,20)/b7-6-,11-8+/t14-/m0/s1