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