以下为句子列表：
英文: Its optical and racemic isomers reacted with S(-) _α _ phenylethyl amine to form their amidates, which were purified by TLC, then determined by HPLC with a reference of the amidate of the cis _ racemic acid.
中文: 其旋光异构体与S( -)_α_甲基苄胺衍生化 ,生成相应的酰胺 ; 经TLC纯化后 ,以外消旋顺式二氯菊酸酰胺作为对照 ,用HPLC检测其旋光异构体的光学纯度 ;
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