1 H - NMR ( 400 MHz , CDCl 3 ) δ = 2 . 50 - 2 . 61 ( 8 H , m , 4 CH 2 ) , 2 . 72 ( 2 H , s , CH 2 ) , 3 . 49 ( 2 H , s , CH 2 ) , 4 . 01 - 4 . 02 ( 2 H , m , CH 2 ) , 4 . 07 - 4 . 12 ( 1 H , m , CH ) , 6 . 97 - 6 . 99 ( 2 H , d , J = 8 . 6 , Ph ) , 7 . 18 - 7 . 25 ( 3 H , m , Ph ) , 7 . 34 ( 1 H , s , Ph ) , 7 . 53 - 7 . 55 ( 2 H , d , J = 8 . 6 , Ph ) .