Used primarily as an intermediate in the synthesis of complex organic compounds, particularly in the pharmaceutical industry. It plays a crucial role in the production of active pharmaceutical ingredients (APIs), especially those involving sulfonamide and benzoyl chloride functional groups. Its reactive chlorosulfonyl and acyl chloride groups make it valuable for constructing molecules with specific biological activities, such as antimicrobial or anti-inflammatory agents. Additionally, it is employed in research and development for creating novel chemical entities with potential therapeutic applications.