1 H NMR ( 300 MHz , CDCl 3 ) δ 8 . 35 ( s , 1 H ) , 8 . 08 ( d , 2 H , J = 8 . 7 Hz ) , 7 . 73 ( d , 2 H , J = 8 . 7 Hz ) , 7 . 33 ( d , 2 H , J = 9 . 2 Hz ) , 6 . 95 ( d , 2 H , J = 9 . 0 Hz ) , 4 . 61 ( s , 2 H ) , 3 . 14 ( m , 2 H ) , 2 . 89 ( m , 2 H ) , 2 . 48 ( m , 4 H ) , 1 . 59 ( m , 4 H ) , 1 . 44 ( m , 2 H ) ; MS ( m / z ) : 440 ( M +).