1 H - NMR ( 400 MHz , CDCl 3 ) δ = 1 . 96 ( 2 H , m , CH 2 ) , 2 . 49 ( 2 H , t , J = 7 . 30 Hz , CH 2 ) , 2 . 54 ( 2 H , t , J = 6 . 42 Hz , CH 2 ) , 2 . 68 ( 4 H , s , 2 CH 2 ) , 3 . 10 ( 4 H , s , 2 CH 2 ) , 6 . 98 - 7 . 49 ( 8 H , m , Ph ) , 8 . 56 ( 1 H , bs , NH )