1 H - NMR ( 400 MHz , CDCl 3 ) δ = 2 . 58 - 2 . 70 ( m , 4 H , 2 CH 2 ) , 2 . 83 - 2 . 88 ( m , 2 H , CH 2 ) , 3 . 10 ( brs , 4 H , 2 CH 2 ) , 3 . 97 ( d , 1 H , J = 2 . 908 Hz , CHA ) , 3 . 99 ( d , 1 H , J = 1 . 792 Hz , CHB ) , 4 . 11 - 4 . 16 ( m , 1 H , CH ) , 6 . 75 - 7 . 37 ( m , 8 H , Ph ) .