1 H - NMR ( 400 MHz , CDCl 3 ) δ = 1 . 97 ( 2 H , m , CH 2 ) , 2 . 44 - 2 . 53 ( 4 H , m , 2 CH 2 ) , 2 . 61 ( 4 H , t , J = 4 . 89 Hz , 2 CH 2 ) , 3 . 18 ( 4 H , t , J = 4 . 86 Hz , 2 CH 2 ) , 7 . 94 ( 1 H , bs , NH ) , 6 . 84 - 8 . 35 ( 8 H , m , Ph ) ;