1 H NMR ( 400 MHz , 클로로포름 - d ) δ 8 . 16 ( dd , J = 2 . 4 , 0 . 7 Hz , 1 H ) , 7 . 52 ( dd , J = 8 . 8 , 2 . 4 Hz , 1 H ) , 6 . 20 ( d , J = 8 . 8 Hz , 1 H ) , 4 . 84 ( s , 4 H ) , 4 . 17 ( s , 5 H ) .