InChI=1/C21H22N2O2/c1-14-9-11-15(12-10-14)23-19(24)17-8-6-5-7-16(17)18(20(23)25)13-22-21(2,3)4/h5-13,22H,1-4H3/b18-13+ E7E675FECBBDF840