1 H - NMR ( 400 MHz , CDCl 3 ) δ = 2 . 48 - 2 . 59 ( m , 8 H , 4 CH 2 ) , 2 . 71 ( brs , 2 H , CH 2 ) , 3 . 48 ( s , 2 HCH 2 ( benzyl ) ) , 3 . 94 ( d , 1 H , J = 2 . 916 Hz , CHA ) , 3 . 95 ( brs , 1 H , CHB ) , 4 . 05 - 4 . 08 ( m , 1 H , CH ) , 6 . 86 - 7 . 33 ( m , 8 H , Ph ) .