1 H NMR ( 400 MHz , 클로로포름 - d ) δ 10 . 34 ( s , 1 H ) , 8 . 52 ( d , J = 2 . 5 Hz , 1 H ) , 7 . 76 ( dd , J = 8 . 9 , 2 . 5 Hz , 1 H ) , 7 . 16 ( d , J = 10 . 4 Hz , 2 H ) , 6 . 61 ( d , J = 8 . 8 Hz , 1 H ) , 4 . 71 ( t , J = 6 . 2 Hz , 2 H ) , 4 . 50 ( s , 2 H ) , 3 . 87 ( t , J = 6 . 2 Hz , 3 H ) , 3 . 57 ( s , 4 H ) , 2 . 78 ( d , J = 7 . 3 Hz , 1 H ) , 1 . 64 ( d , J = 8 . 9 Hz , 1 H ) .