Used as an intermediate in the synthesis of agrochemicals and pharmaceuticals, particularly in the development of sulfa-based drugs and herbicides. Its structure allows for selective functionalization, making it valuable in creating sulfonamide derivatives with biological activity. Commonly employed in coupling reactions to introduce sulfonyl groups into complex molecules, enhancing their reactivity or binding properties. Also utilized in the preparation of dyes and fluorescent probes due to its electron-withdrawing characteristics and stability under various reaction conditions.