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