Used as an intermediate in the synthesis of pharmaceuticals and fine chemicals, particularly in the development of iodinated contrast agents for medical imaging. Its reactive chlorosulfonyl and iodo groups allow for selective functionalization, making it valuable in constructing complex aromatic molecules. Commonly employed in coupling reactions and radiolabeling processes due to the presence of iodine, which can be easily substituted or used in tracer applications. Also utilized in the preparation of sulfonamide derivatives with potential biological activity.