InChI=1S/C21H29NO4/c1-16(2)14-22-21(24)13-18(23)9-7-5-3-4-6-8-17-10-11-19-20(12-17)26-15-25-19/h6-12,16,18,23H,3-5,13-15H2,1-2H3,(H,22,24)/b8-6+,9-7+