1 H NMR ( 400 MHz , 클로로포름 - d ) δ 8 . 36 - 8 . 26 ( m , 1 H ) , 7 . 65 ( dd , J = 9 . 0 , 2 . 4 Hz , 1 H ) , 6 . 40 ( d , J = 9 . 0 Hz , 1 H ) , 4 . 33 ( s , 2 H ) , 3 . 82 ( d , J = 40 . 5 Hz , 2 H ) , 3 . 05 ( s , 2 H ) , 1 . 94 ( dd , J = 8 . 7 , 4 . 6 Hz , 2 H ) , 1 . 73 ( d , J = 7 . 3 Hz , 2 H ) , 1 . 47 ( s , 9 H ) .