1 H NMR ( 400 MHz , 클로로포름 - d ) δ 7 . 12 ( d , J = 8 . 5 Hz , 2 H ) , 6 . 63 ( d , J = 8 . 6 Hz , 2 H ) , 3 . 69 ( d , J = 20 . 0 Hz , 2 H ) , 3 . 30 ( t , J = 7 . 0 Hz , 2 H ) , 2 . 36 ( t , J = 8 . 1 Hz , 2 H ) , 1 . 89 ( tt , J = 7 . 7 , 6 . 8 Hz , 2 H ) , 1 . 72 ( s , 6 H ) .