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