1 H NMR ( 300 MHz , CDCl 3 ) δ 1 . 71 ( t , 2 H ) , 1 . 80 ( d , 2 H ) , 1 . 96 ( m , 2 H ) , 2 . 01 ( m , 2 H ) , 2 . 27 ( t , 2 H ) , 2 . 48 ( m , 1 H ) , 2 . 84 ( br - d , 2 H ) , 4 . 37 ( t , J = 14 . 4 , 2 H ) , 7 . 01 ( d , J = 7 . 5 , 1 H ) 7 . 31 ( m , 3 H ) , 7 . 51 ( m , 7 H ) , 7 . 72 ( d , 2 H ) , 7 . 86 ( m , 4 H ) ; MS ( m / e , M +): 549 , 490 , 443 , 408