1 H - NMR ( 400 MHz , CDCl 3 ) δ = 1 . 88 ( 2 H , m , CH 2 ) , 2 . 31 - 2 . 48 ( 12 H , m , 6 CH 2 ) , 3 . 46 ( 2 H , s , CH 2 ( benzyl ) ) , 7 . 23 - 7 . 46 ( 8 H , m , Ph ) , 8 . 34 ( 1 H , bs , NH )