1 H NMR ( CDCl 3 , 300 MHz ) 1 . 41 ( t , 3 H , J = 7 . 5 Hz ) , 2 . 31 ( s , 3 H ) , 2 . 45 ( s , 3 H ) , 3 . 03 ( q , 2 H , J = 7 . 5 Hz ) , 3 . 36 ( s , 3 H ) , 6 . 59 ( dd , 1 H , J = 1 . 5 & 5 . 3 Hz ) , 6 . 89 ( s , 1 H ) , 7 . 11 ( m , 3 H ) , 7 . 39 ( m , 3 H ) , 7 . 77 ( m , 1 H ) , 7 . 85 ( s , 1 H ) , 7 . 94 ( d , 1 H , J = 5 . 3 Hz ) . 수율 = 45 %