화합물 A 1 g 의 1 H NMR ( CDCl 3 , 300 MHz ) : δ 7 . 34 - 7 . 30 ( m , 5 H ) , 5 . 92 ( q , J = 6 . 3 Hz , 1 H ) , 5 . 20 ( d , J = 9 . 6 Hz , 1 H ) , 4 . 44 ( d , J = 9 . 6 Hz , 1 H ) , 1 . 58 ( d , J = 6 . 9 Hz , 3 H ) , 1 . 45 ( s , 9 H ) , 1 . 21 ( s , 3 H ) , 1 . 11 ( s , 3 H ) .