H 1 - NMR [ CDCl 3 , 300 MHz ] 1 . 56 - 1 . 63 ( 2 H , m ) , 1 . 65 - 1 . 75 ( 3 H , m ) , 1 . 97 - 2 . 13 ( 2 H , m ) , 2 . 27 - 2 . 34 ( 1 H , m ) , 3 . 75 - 3 . 83 ( 1 H , m ) , 6 . 56 - 6 . 58 ( 1 H , dd , J = 1 . 26 Hz , 5 . 4 Hz ) , 6 . 87 ( 1 H , s ) , 6 . 93 - 6 . 99 ( 2 H , t , J = 8 . 67 Hz ) , 7 . 44 - 7 . 51 ( 4 H , m ) , 7 . 54 - 7 . 62 ( 1 H , m ) , 7 . 88 - 7 . 91 ( 2 H , d , J = 7 . 32 Hz ) , 7 . 95 - 7 . 97 ( 1 H , d , J = 5 . 19 Hz ) , 8 . 81 ( 1 H , s ) . 수율 = 45 %.