1 H - NMR ( 400 MHz , CDCl 3 ) δ = 2 . 57 - 2 . 67 ( m , 4 H , CH 2 ) , 2 . 85 - 2 . 90 ( m , 2 H , CH 2 ) , 3 . 14 ( brs , 4 H , 2 CH 2 ) , 3 . 97 ( d , 1 H , J = 2 . 416 Hz , CHA ) , 3 . 98 ( s , 1 H , CHB ) , 4 . 10 - 4 . 16 ( m , 1 H , CH ) , 6 . 85 - 7 . 24 ( m , 8 H , Ph ) .