InChI=1S/C21H27NO4/c1-15(2)13-22-21(23)20-18(26-20)9-7-5-3-4-6-8-16-10-11-17-19(12-16)25-14-24-17/h6-12,15,18,20H,3-5,13-14H2,1-2H3,(H,22,23)/b8-6+,9-7+