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磷柳酸（FosfosaiⅠ）是一个新的水杨酸衍生物。本文介绍了用水杨酸与氯化氧磷反应制取Ⅰ的新方法，该法操作简便，收率好。
Fosfosai I is a new salicylic acid derivative. This paper introduces a new method for the preparation of Ⅰ by the reaction of salicylic acid with phosphorus oxychloride. The method is simple and easy to operate with good yield.