광학 순도 99 . 1 % ee ( HPLC ) ; 1 H NMR ( CDCl 3 , ppm ) δ 1 . 12 ( s , 9 H ) , 2 . 89 ( m , 4 H ) , 3 . 70 ( q , 2 H ) , 4 . 94 ( s , 1 H ) , 5 . 76 ( d , 1 H , J = 5 . 6 ㎐), 5 . 84 ( d , 1 H , J = 5 . 6 ㎐), 6 . 66 ( d , 1 H , J = 4 . 8 ㎐), 7 . 04 ( d , 1 H , J = 4 . 8 ㎐), 7 . 28 ( m , 2 H ) , 7 . 41 ( m , 1 H ) , 7 . 67 ( m , 1 H )