1 H - NMR ( 400 MHz , CDCl 3 ) δ = 2 . 43 ( 2 H , t , J = 5 . 58 Hz , CH 2 ) , 2 . 57 ( 6 H , s , 3 CH 2 ) , 2 . 64 ( 4 H , t , J = 5 . 80 Hz , 2 CH 2 ) , 3 . 45 ( 2 H , s , CH 2 ( benzyl ) ) , 7 . 09 - 7 . 57 ( 5 H , m , Ph ) , 11 . 24 ( 1 H , bs , NH ) ;