InChI=1S/C20H32O4/c1-2-3-6-10-17(21)13-14-18-16(12-15-19(18)22)9-7-4-5-8-11-20(23)24/h4,7,13-14,16-18,21H,2-3,5-6,8-12,15H2,1H3,(H,23,24)/b7-4-,14-13+