1 H NMR [ CDCl 3 , 300 MHz ] 1 . 41 - 1 . 46 ( 3 H , t , J = 7 . 56 Hz ) , 3 . 03 - 3 . 11 ( 2 H , q , J = 7 . 56 Hz ) , 3 . 37 ( 3 H , s ) , 6 . 59 - 6 . 61 ( 1 H , dd , J = 1 . 57 Hz , J = 5 . 35 Hz ) , 6 . 89 ( 1 H , s ) , 7 . 29 - 7 . 31 ( 3 H , m ) , 7 . 48 - 7 . 50 ( 2 H , m ) , 7 . 56 - 7 . 61 ( 3 H , m ) , 7 . 93 - 7 . 95 ( 1 H , d , J = 5 . 42 Hz ) , 8 . 00 - 8 . 03 ( 2 H , dd , J = 1 . 58 Hz , J = 7 . 69 Hz ) . 수율 = 67 %.