Used as an intermediate in the synthesis of pharmaceuticals, particularly in the development of kinase inhibitors and anti-inflammatory agents. Its sulfonyl chloride group readily reacts with amines to form sulfonamides, which are key structural motifs in many biologically active compounds. Commonly employed in medicinal chemistry for constructing drug candidates targeting cancer and central nervous system disorders. Also utilized in the preparation of dyes and fluorescent probes due to its aromatic and reactive scaffold.