Used as a key intermediate in the synthesis of pharmaceutical agents, particularly in the development of bioactive molecules and drug candidates. Its sulfonyl chloride group readily reacts with amines and alcohols, making it valuable for constructing sulfonamide and sulfonate ester derivatives. Commonly employed in medicinal chemistry for modifying molecular frameworks to enhance pharmacokinetic properties. Also utilized in the preparation of agrochemicals and functional materials where aromatic heterocyclic sulfonyl groups are required.