1 H NMR ( 400 MHz , 클로로포름 - d ) δ 10 . 39 ( s , 1 H ) , 8 . 70 ( dd , J = 8 . 6 , 5 . 5 Hz , 1 H ) , 7 . 67 ( d , J = 9 . 9 Hz , 3 H ) , 7 . 48 ( dd , J = 9 . 8 , 2 . 3 Hz , 1 H ) , 7 . 11 ( ddd , J = 7 . 9 , 5 . 5 , 2 . 3 Hz , 1 H ) .