InChI=1S/C18H23NO3/c1-14(2)12-19-18(20)8-6-4-3-5-7-15-9-10-16-17(11-15)22-13-21-16/h5-11,14H,3-4,12-13H2,1-2H3,(H,19,20)/b7-5+,8-6+