InChI=1S/C20H27NO4/c1-15(2)13-21-20(23)10-8-6-4-3-5-7-9-16-11-18-19(12-17(16)22)25-14-24-18/h7-12,15,22H,3-6,13-14H2,1-2H3,(H,21,23)/b9-7+,10-8+