1 H NMR [ CDCl 3 , 300 MHz ] 1 . 42 ( t , 3 H , J = 7 . 59 Hz ) , 3 . 04 ( q , 2 H , J = 7 . 51 Hz ) , 6 . 58 ( d , 1 H , J = 5 . 49 Hz ) , 7 . 04 ( s , 1 H ) , 7 . 47 ( m , 10 H ) , 7 . 91 ( d , 1 H , J = 5 . 1 Hz ) , 8 . 03 ( d , 5 H , J = 6 . 38 Hz ) . 수율 = 63 %.