InChI=1S/C20H27NO4/c1-15(2)13-21-20(23)11-9-17(22)7-5-3-4-6-16-8-10-18-19(12-16)25-14-24-18/h4,6,8-12,15,17,22H,3,5,7,13-14H2,1-2H3,(H,21,23)/b6-4+,11-9+