1 H NMR , [ CDCl 3 , 300 MHz ] 8 . 0 ( d , 1 H , J = 5 . 4 Hz ) , 7 . 9 ( d , 2 H , J = 9 Hz ) , 7 . 4 ( m , 2 H ) , 7 . 0 ( m , 4 H ) , 6 . 8 ( s , 1 H ) , 6 . 5 ( dd , 1 H , J = 1 . 5 , 3 . 9 Hz ) , 3 . 8 ( s , 3 H ) , 3 . 3 ( s , 3 H ) , 3 . 0 ( q , 2 H , J = 7 . 5 , 7 . 5 Hz ) , 1 . 4 ( t , 3 H , J = 7 . 8 , 7 . 5 Hz ) . 수율 = 57 %.