1 H NMR [ CDCl 3 , 300 MHz ] 8 . 05 ( m , 2 H ) , 7 . 96 ( d , 1 H , J = 5 . 3 Hz ) , 7 . 5 ( m , 2 H ) , 7 . 31 ( m , 3 H ) , 7 . 24 ( m , 2 H ) , 6 . 87 ( s , 1 H ) , 6 . 64 ( dd , 1 H , J = 1 . 6 , 5 . 3 Hz ) , 3 . 37 ( s , 3 H ) , 3 . 12 ( q , 2 H , J = 7 . 6 Hz ) , 1 . 47 ( t , 3 H , J = 7 . 6 Hz ) . 수율 = 28 %.