1 H NMR ( 400 MHz , 클로로포름 - d ) δ 10 . 34 ( d , J = 1 . 0 Hz , 1 H ) , 7 . 55 ( d , J = 2 . 4 Hz , 1 H ) , 7 . 47 - 7 . 38 ( m , 2 H ) , 6 . 67 ( d , J = 2 . 4 Hz , 1 H ) , 6 . 15 ( tt , J = 55 . 3 , 4 . 3 Hz , 1 H ) , 4 . 52 ( td , J = 13 . 5 , 4 . 3 Hz , 2 H ) .