1 H - NMR ( 400 MHz , CDCl 3 ) δ = 1 . 89 ( 2 H , m , CH 2 ) , 2 . 42 - 2 . 53 ( 12 H , m , 6 CH 2 ) , 3 . 49 ( 2 H , s , CH 2 ( benzyl ) ) , 7 . 19 - 7 . 47 ( 8 H , m , Ph ) , 8 . 90 ( 1 H , bs , NH )