InChI=1S/C21H27NO4/c1-21(2,24)15-22-20(23)11-9-7-5-3-4-6-8-10-17-12-13-18-19(14-17)26-16-25-18/h5,7-14,24H,3-4,6,15-16H2,1-2H3,(H,22,23)/b7-5+,10-8+,11-9+