1 H - NMR ( 400 MHz , CDCl 3 ) δ = 1 . 95 ( 2 H , m , CH 2 ) , 2 . 47 ( 2 H , m , CH 2 ) , 2 . 61 ( 2 H , m , CH 2 ) , 3 . 21 ( 8 H , m , 4 CH 2 ) , 6 . 77 - 7 . 54 ( 8 H , m , Ph ) , 8 . 24 ( 1 H , bs , NH )