InChI=1S/C20H38O3/c1-2-3-4-5-6-7-10-13-16-19(21)17-14-11-8-9-12-15-18-20(22)23/h13,16,19,21H,2-12,14-15,17-18H2,1H3,(H,22,23)/b16-13+