Used in the synthesis of biocompatible polymers and drug delivery systems due to its disulfide linkage, which enables controlled release in reducing environments such as inside cells. Commonly employed in bioconjugation techniques to link drugs, peptides, or imaging agents to carriers, taking advantage of its cleavable bond under physiological conditions. Also utilized in the development of responsive hydrogels and functionalized nanoparticles for targeted therapy. Its amine and carboxylic acid groups allow for easy modification and coupling reactions, making it valuable in pharmaceutical research and biomaterials science.