InChI=1S/C20H32O4/c1-6-20(5,24)12-8-11-15(2)9-7-10-16(3)13-18(21)14-17(4)19(22)23/h6,10-11,14,18,21,24H,1,7-9,12-13H2,2-5H3,(H,22,23)/b15-11-,16-10-,17-14-