1 H - NMR ( 400 MHz , CDCl 3 ) δ = 2 . 58 ( 2 H , t , J = 5 . 66 Hz , CH 2 ) , 2 . 81 ( 6 H , t , J = 5 . 69 Hz , 3 CH 2 ) , 3 . 19 ( 4 H , s , 2 CH 2 ) , 7 . 01 - 7 . 73 ( 6 H , m , Ph ) , 11 . 30 ( 1 H , bs , NH ) ;