The method was established for purification of diflubenzuron by crystal technique with mixed solvents.

本文论述了利用混合溶剂——结晶法提纯除脲的分析技术。

A new typal insecticide, its generation, physical and chemical properties, insecticidal mechanism, insecticidal characteristic and synthesis of diflubenzuron are introduced.

介绍了新型剂──除脲的发现、理化性质、理、特点及合成方法。

More and more attention is being paid to their functions in anti-cancer, analgesia, regulating cholesterol level in the human body，preventing atheroma，deinsectization and other aspects.

檬苦素类化合物在抗癌、、节体内胆固醇水平、防止动脉粥样化和除等方面的作用，越来越受到人们的重视。