InChI=1S/C21H23N3O3/c1-4-20(2,3)17-14(13-8-5-6-9-15(13)22-17)12-16-18(25)24-11-7-10-21(24,27)19(26)23-16/h4-6,8-9,12,22,27H,1,7,10-11H2,2-3H3,(H,23,26)/b16-12-