InChI=1S/C20H29NO4/c1-16(14-22)13-21-20(23)9-7-5-3-2-4-6-8-17-10-11-18-19(12-17)25-15-24-18/h6,8,10-12,16,22H,2-5,7,9,13-15H2,1H3,(H,21,23)/b8-6+