1 H NMR ( 300 MHz , CDCl 3 ) δ 1 . 50 ( - 1 . 79 ( m , 6 H ) , 2 . 08 ( m , 2 H ) , 2 . 17 ( m , 3 H ) , 2 . 45 ( m , 1 H ) , 2 . 78 ( t , 2 H ) , 2 . 85 ( br - d , 2 H ) , 4 . 37 ( t , 2 H ) , 6 . 92 ( d , 1 H ) , 7 . 24 - 7 . 37 ( m , 5 H ) , 7 . 45 ( m , 1 H ) , 7 . 50 ( d , 2 H , J = 8 . 4 Hz ) , 7 . 78 ( d , 2 H , J = 8 . 4 Hz ) , 7 . 84 ( m , 1 H ) ; MS ( m / e , M +): 472 , 231 , 188 , 160 , 146