Used as a crosslinking agent in pharmaceutical and polymer synthesis, particularly in the development of controlled-release drug delivery systems. Its dual amine and thiol functional groups enable it to act as a linker in forming disulfide bonds, which are valuable in creating biodegradable polymers and prodrugs that respond to reducing environments, such as inside cells. Commonly employed in the preparation of conjugates for targeted therapy, including antibody-drug conjugates and polymeric micelles. Also utilized in modifying biomolecules and peptides to enhance stability or enable site-specific coupling. Its redox-sensitive nature makes it suitable for applications in responsive nanomaterials and smart hydrogels.