InChI=1S/C28H42O4/c1-3-5-7-9-10-11-12-13-14-16-18-23-32-28(30)26-21-19-20-25(24-26)27(29)31-22-17-15-8-6-4-2/h19-21,24H,3-15,17,22-23H2,1-2H3