수율 91 % ; 광학 순도 : 99 . 0 % ( HPLC ) ; 1 H NMR ( 300 MHz , CDCl 3 ) δ 9 . 16 ( brs , 1 H ) , 7 . 96 - 7 . 99 ( m , 1 H ) , 7 . 38 - 7 . 43 ( m , 1 H ) , 7 . 25 - 7 . 30 ( m , 2 H ) , 7 . 16 ( d , 1 H , J = 5 . 1 Hz ) , 6 . 66 ( d , 1 H , J = 5 . 1 Hz ) , 5 . 24 ( s , 1 H ) , 4 . 17 - 4 . 31 ( m , 2 H ) , 3 . 52 - 3 . 57 ( m , 1 H ) , 3 . 30 - 3 . 32 ( m , 1 H ) , 3 . 04 ( brs , 2 H )