InChI=1S/C18H23NO3/c20-18(19-11-5-6-12-19)8-4-2-1-3-7-15-9-10-16-17(13-15)22-14-21-16/h3,7,9-10,13H,1-2,4-6,8,11-12,14H2/b7-3-