InChI=1S/C20H27NO4/c1-15(2)13-21-20(23)17(22)9-7-5-3-4-6-8-16-10-11-18-19(12-16)25-14-24-18/h5-8,10-12,15,17,22H,3-4,9,13-14H2,1-2H3,(H,21,23)/b7-5+,8-6+