1 H - NMR ( 400 MHz , CDCl 3 ) δ = 2 . 47 - 2 . 55 ( m , 8 H , 4 CH 2 ) , 2 . 70 ( brs , 2 H , CH 2 ) , 3 . 51 ( s , 2 HCH 2 ( benzyl ) ) , 3 . 93 ( d , 1 H , J = 2 . 16 Hz , CHA ) , 3 . 94 ( d , 1 H , J = 0 . 87 Hz , CHB ) , 4 . 04 - 4 . 08 ( m , 1 H , CH ) , 6 . 83 - 7 . 32 ( m , 8 H , Ph ) .