InChI=1S/C21H29NO4/c1-15(2)13-22-21(23)11-10-19-18(26-19)7-5-3-4-6-16-8-9-17-20(12-16)25-14-24-17/h4,6,8-9,12,15,18-19H,3,5,7,10-11,13-14H2,1-2H3,(H,22,23)/b6-4+