1 H - NMR ( 400 MHz , CDCl 3 ) δ = 2 . 51 ( 2 H , t , J = 5 . 74 Hz , CH 2 ) , 2 . 63 ( 6 H , s , 3 CH 2 ) , 2 . 71 ( 4 H , t , J = 5 . 72 Hz , 2 CH 2 ) , 3 . 59 ( 2 H , s , CH 2 ( benzyl ) ) , 7 . 26 - 7 . 67 ( 7 H , m , Ph ) , 11 . 43 ( 1 H , bs , NH ) ;