1 H NMR ( CDCl 3 , 300 MHz ) 0 . 95 ( d , 3 H , J = 6 . 6 Hz ) , 1 . 04 ( d , 3 H , J = 6 . 6 Hz ) , 1 . 41 ( t , 3 H , J = 7 . 5 Hz ) , 2 . 31 ( s , 3 H ) , 3 . 03 ( q , 2 H , J = 7 . 5 Hz ) , 3 . 23 ( dd , 1 H , J = 6 . 6 & 6 . 6 Hz ) , 3 . 41 ( dd , 2 H , J = 5 . 7 & 6 Hz ) , 6 . 55 ( dd , 1 H , J = 1 . 5 & 5 . 4 Hz ) , 6 . 87 ( s , 1 H ) , 7 . 11 ( m , 3 H ) , 7 . 37 ( s , 1 H ) , 7 . 51 ( m , 3 H ) , 7 . 90 ( d , 1 H , J = 5 . 4 Hz ) , 7 . 95 ( m , 2 H ) . 수율 = 39 %.