1 H - NMR ( 400 MHz , CDCl 3 ) δ = 2 . 61 ( 2 H , t , J = 5 . 74 Hz , CH 2 ) , 2 . 77 ( 6 H , s , 3 CH 2 ) , 3 . 30 ( 4 H , s , 2 CH 2 ) , 6 . 78 - 8 . 39 ( 8 H , m , Ph ) , 11 . 22 ( 1 H , bs , NH ) ;