Application: CIS-5-Norbornene-Exo-2,3-di Carboxylic Anhydride is divided into two configurations, namely, Internal methylenetetrahydrohalic anhydride and outer methylene tetrahydrohalic anhydride, which have different uses. Exomethylene tetrahydrohalic anhydride is an important chemical raw material, which is widely used in electronics, synthetic resin, petroleum industry, pesticides and other fields.