1 H NMR ( 300 MHz , CDCl 3 ) δ 1 . 60 - 1 . 74 ( m , 4 H ) , 1 . 89 - 1 . 98 ( m , 4 H ) , 2 . 14 ( m , 3 H ) , 2 . 27 ( t , 2 H ) , 2 . 42 ( m , 1 H ) , 2 . 49 ( s , 3 H ) , 2 . 84 ( br - d , 2 H ) , 4 . 32 ( t , 2 H ) , 6 . 95 ( d , 1 H ) , 7 . 13 ( m , 1 H ) , 7 . 23 - 7 . 40 ( m , 5 H ) , 7 . 49 - 7 . 59 ( m , 4 H ) , 7 . 70 - 7 . 74 ( m , 3 H ) ; MS ( m / e , M +): 466 , 438 , 360 , 291 , 250 , 231