InChI=1S/C20H34O4/c1-2-3-4-5-6-9-13-18(21)14-10-7-8-11-15-19(22)16-12-17-20(23)24/h6-9,11,15,18-19,21-22H,2-5,10,12-14,16-17H2,1H3,(H,23,24)/b8-7+,9-6-,15-11-/t18-,19-/m0/s1