Used in biochemical research as a disulfide-containing linker for conjugation and protein modification. Its carboxylic acid group allows for easy coupling to amines via amide bond formation, while the disulfide bond provides a cleavable linkage sensitive to reducing environments. This makes it valuable in the design of prodrugs, targeted drug delivery systems, and redox-responsive biomaterials. Commonly employed in the synthesis of peptide conjugates and antibody-drug linkers where controlled release is required. Also utilized in surface functionalization of nanoparticles and biosensors, where reversible binding and stimuli-responsive behavior are needed.