Used primarily as an intermediate in the synthesis of sulfa drugs and other pharmaceuticals. It plays a key role in the preparation of sulfonamide-based compounds, which are important in the development of antibiotics and anti-inflammatory agents. Its reactive sulfonyl chloride group allows for easy attachment to amines, making it valuable in constructing biologically active molecules. Also employed in agrochemical synthesis for creating herbicides and plant growth regulators. Its cyano and methyl functional groups enhance reactivity and influence the electronic properties of the final products, improving target specificity in drug design.