InChI=1S/C21H36O4/c1-2-3-4-5-6-7-8-9-10-11-12-13-14-15-16-17-21(24)25-20(18-22)19-23/h6-7,9-10,12-13,20,22-23H,2-5,8,11,14-19H2,1H3/b7-6-,10-9-,13-12-