1 H - NMR ( 400 MHz , CDCl 3 ) δ = 1 . 95 ( 2 H , m , CH 2 ) , 2 . 48 ( 2 H , t , J = 6 . 72 Hz , CH 2 ) , 2 . 54 ( 2 H , t , J = 6 . 36 Hz , CH 2 ) , 2 . 67 ( 4 H , t , J = 4 . 90 Hz , 2 CH 2 ) , 3 . 16 ( 4 H , t , J = 4 . 92 Hz , 2 CH 2 ) , 6 . 87 - 7 . 68 ( 6 H , m , Ph ) , 8 . 79 ( 1 H , bs , NH ) ;