Used as an intermediate in the synthesis of pharmaceuticals, particularly in the development of nonsteroidal anti-inflammatory drugs (NSAIDs). Its functional groups allow for further chemical modifications, making it valuable in constructing complex organic molecules. Commonly employed in sulfonamide formation reactions due to the chlorosulfonyl group, which readily reacts with amines. Also utilized in the preparation of agrochemicals and bioactive compounds where bromo and ester functionalities are needed for coupling reactions or as leaving groups.