InChI=1S/C22H31NO4/c1-16(2)14-23-21(24)10-8-6-4-3-5-7-9-19-22(27-19)17-11-12-18-20(13-17)26-15-25-18/h4,6,11-13,16,19,22H,3,5,7-10,14-15H2,1-2H3,(H,23,24)/b6-4+