H 1 - NMR [ CDCl 3 , 300 MHz ] 1 . 27 - 1 . 29 ( 3 H , d , J = 6 . 81 Hz ) , 1 . 41 - 1 . 44 ( 3 H , d , J = 6 . 78 Hz ) , 3 . 57 - 3 . 66 ( 1 H , m ) , 6 . 59 - 6 . 62 ( 1 H , dd , J = 1 . 27 , 5 . 19 Hz ) , 6 . 89 ( 1 H , s ) , 6 . 97 - 7 . 02 ( 1 H , m ) , 7 . 23 ( 2 H , s ) , 7 . 27 ( 1 H , s ) , 7 . 51 - 7 . 61 ( 3 H , m ) , 7 . 87 - 7 . 89 ( 2 H , d , J = 7 . 19 z ) , 7 . 98 - 8 . 0 ( 1 H , d , J = 5 . 22 Hz ) , 8 . 83 ( 1 H , s ) . 수율 = 75 %.