Used primarily as an intermediate in the synthesis of pharmaceuticals, particularly in the development of sulfonamide-based drugs. Its reactive chlorosulfonyl group allows for easy attachment to amines, making it valuable in creating biologically active compounds. It is also employed in the preparation of agrochemicals and functionalized pyridine derivatives used in medicinal chemistry. Due to its ester and sulfonyl chloride functionalities, it serves as a building block for further chemical modifications in research laboratories and industrial processes.