Lufenuron is an insecticide that is commonly used to control fleas and other pests in domestic animals. During the production of lufenuron, impurities may be formed due to the reaction of various reactants or byproducts. These impurities can affect the purity of lufenuron, its efficacy, and safety. Therefore, it is crucial to identify and characterize these impurities to ensure the quality and safety of lufenuron products.