Used as an intermediate in pharmaceutical synthesis, particularly in the development of bioconjugation reagents and targeted drug delivery systems. Its sulfonamide and carboxylic acid functional groups allow for easy coupling with amines and alcohols, making it valuable in constructing complex molecules for medicinal chemistry. Commonly employed in the preparation of proteolysis-targeting chimeras (PROTACs) and other bifunctional compounds where linker functionality is critical. Also utilized in research settings to modify biomolecules due to its water solubility and stability under physiological conditions.