InChI=1S/C20H32O4/c21-18-14-10-6-4-2-1-3-5-7-11-15-19(22)16-12-8-9-13-17-20(23)24/h1-2,5,7-8,11-12,15,19,21-22H,3-4,6,9-10,13-14,16-18H2,(H,23,24)/b2-1-,7-5-,12-8-,15-11?