1 H - NMR ( 400 MHz , CDCl 3 ) δ = 2 . 50 ( 2 H , t , J = 5 . 56 Hz , CH 2 ) , 2 . 63 ( 6 H , m , 3 CH 2 ) , 2 . 69 ( 4 H , t , J = 5 . 58 Hz , 2 CH 2 ) , 3 . 86 ( 2 H , s , CH 2 ( benzyl ) ) , 6 . 99 - 7 . 67 ( 5 H , m , Ph ) , 11 . 43 ( 1 H , bs , NH ) ;