Used as an intermediate in the synthesis of sulfa drugs and other biologically active sulfonamide compounds. Its reactivity allows for selective bromination and sulfonamide bond formation, making it valuable in pharmaceutical research and development. Commonly employed in the preparation of dyes, fluorescent probes, and agrochemicals due to its ability to modify aromatic structures with functional groups that enhance binding or optical properties. Also utilized in organic synthesis for constructing complex molecules where controlled substitution on an aromatic ring is required.