1 H NMR ( 400 MHz , 클로로포름 - d ) δ 7 . 08 ( dd , J = 33 . 4 , 8 . 0 Hz , 2 H ) , 6 . 72 - 6 . 56 ( m , 2 H ) , 5 . 44 ( s , 1 H ) , 3 . 62 ( d , J = 4 . 8 Hz , 3 H ) , 3 . 09 ( d , J = 47 . 9 Hz , 2 H ) , 1 . 22 ( t , J = 7 . 0 Hz , 4 H ) .