Used primarily as an intermediate in the synthesis of biologically active compounds, especially in pharmaceuticals and agrochemicals. Its sulfonyl chloride group readily reacts with amines and alcohols, making it valuable for constructing sulfonamide and sulfonate ester derivatives. Commonly employed in the development of dyes, fluorescent probes, and sensors due to the inherent fluorescence of the benzothiazole core. Also utilized in medicinal chemistry for designing enzyme inhibitors and receptor ligands, particularly in research targeting neurological and inflammatory disorders.