Used in bioconjugation processes, particularly in the development of antibody-drug conjugates (ADCs) and protein labeling. Its disulfide linker provides controlled release under reducing conditions, making it suitable for targeted drug delivery systems. The sulfonic acid group enhances water solubility, improving biocompatibility and stability in physiological environments. Commonly employed in pharmaceutical research for constructing cleavable linkers that respond to intracellular redox environments.