1 H NMR ( 400 MHz , 클로로포름 - d ) δ 10 . 41 ( s , 1 H ) , 7 . 97 ( dd , J = 8 . 0 , 7 . 1 Hz , 1 H ) , 7 . 71 ( d , J = 1 . 7 Hz , 1 H ) , 7 . 50 - 7 . 34 ( m , 2 H ) , 6 . 55 ( d , J = 1 . 7 Hz , 1 H ) .