1 H NMR ( 400 MHz , 클로로포름 - d ) δ 9 . 14 ( d , J = 2 . 7 Hz , 1 H ) , 8 . 31 ( dd , J = 9 . 5 , 2 . 7 Hz , 1 H ) , 6 . 55 ( d , J = 9 . 5 Hz , 1 H ) , 4 . 83 ( d , J = 6 . 6 Hz , 2 H ) , 4 . 34 - 3 . 52 ( m , 4 H ) , 3 . 37 ( dt , J = 9 . 4 , 6 . 8 Hz , 1 H ) , 1 . 98 ( d , J = 9 . 1 Hz , 1 H ) .