InChI=1S/C21H27NO4/c1-17(15-23)14-22-21(24)10-8-6-4-2-3-5-7-9-18-11-12-19-20(13-18)26-16-25-19/h4,6-13,17,23H,2-3,5,14-16H2,1H3,(H,22,24)/b6-4+,9-7+,10-8+