Used primarily as a key intermediate in the synthesis of fipronil, a broad-spectrum insecticide. It plays a critical role in the production of crop protection agents targeting pests in agriculture, including insects resistant to other classes of insecticides. Also involved in the development of veterinary products for controlling fleas, ticks, and other ectoparasites in livestock and companion animals. Its derivative, fipronil, is effective in seed treatments, soil drenches, and spot-on formulations due to its potent action on insect gamma-aminobutyric acid (GABA)-gated chloride channels.