InChI=1S/C21H29NO4/c1-15(2)13-22-20(23)9-7-5-3-4-6-8-18-21(26-18)16-10-11-17-19(12-16)25-14-24-17/h3,5,10-12,15,18,21H,4,6-9,13-14H2,1-2H3,(H,22,23)/b5-3+