InChI=1S/C20H32O4/c1-2-3-4-5-6-9-13-18(21)14-10-7-8-11-15-19(22)16-12-17-20(23)24/h6-10,14,18,21H,2-5,11-13,15-17H2,1H3,(H,23,24)/b8-7+,9-6-,14-10+/t18-/m1/s1