Used primarily as an intermediate in the synthesis of biologically active compounds, especially in pharmaceuticals. 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 central nervous system agents and receptor modulators due to the benzo-fused azepine core, which is known for favorable interactions with neurological targets. Also utilized in medicinal chemistry for scaffold modification and structure-activity relationship studies.