InChI=1S/C20H32O4/c1-2-3-4-5-9-12-15-18-20(24-18)17(21)14-11-8-6-7-10-13-16-19(22)23/h6-7,9,11-12,14,17-18,20-21H,2-5,8,10,13,15-16H2,1H3,(H,22,23)/b7-6?,12-9-,14-11-/t17?,18-,20?/m0/s1