H 1 - NMR [ CDCl 3 , 300 MHz ] 3 . 38 ( 3 H , s ) , 6 . 63 - 6 . 65 ( 1 H , d , J = 5 . 22 Hz ) , 6 . 89 ( 1 H , s ) , 6 . 97 - 7 . 03 ( 2 H , t , J = 8 . 61 Hz ) , 7 . 48 - 7 . 59 ( 4 H , m ) , 7 . 62 - 7 . 66 ( 1 H , m ) , 8 . 00 - 8 . 03 ( 3 H , m ) , 8 . 83 ( 1 H , s ) . 수율 = 82 %.