1 H NMR ( CDCl 3 , 300 MHz ) 1 . 40 ( t , 3 H , J = 7 . 5 Hz ) , 2 . 31 ( s , 3 H ) , 2 . 615 ( s , 3 H ) , 3 . 02 ( q , 2 H , J = 7 . 5 Hz ) , 3 . 35 ( s , 3 H ) , 6 . 6 ( dd , 1 H , J = 1 . 4 & 5 . 3 Hz ) , 6 . 8 ( s , 1 H ) , 7 . 11 ( m , 3 H ) , 7 . 27 ( m , 1 H ) , 7 . 37 ( M , 2 H ) , 7 . 42 ( m , 1 H ) , 7 . 90 ( d , 1 H , J = 5 . 3 Hz ) , 8 . 16 ( d , 1 H , J = 7 . 86 Hz ) . 수율 = 59 %.