InChI=1S/C20H32O4/c1-2-3-4-5-6-7-9-13-18(21)14-10-8-11-15-19(22)16-12-17-20(23)24/h6-11,13,15,18-19,21-22H,2-5,12,14,16-17H2,1H3,(H,23,24)/b7-6-,10-8-,13-9+,15-11+/t18-,19+/m0/s1