InChI=1S/C20H28O4/c1-15(2)14-24-20(22)18-10-6-9-17(13-18)19(21)23-12-11-16-7-4-3-5-8-16/h6,9-10,13,15-16H,3-5,7-8,11-12,14H2,1-2H3