This chemical is widely used in bioconjugation and surface modification due to its thiol group, which allows for covalent bonding with gold, silver, and other metals. Its PEG (polyethylene glycol) spacer provides solubility, stability, and reduced immunogenicity, making it ideal for creating biocompatible surfaces in medical devices and drug delivery systems. The carboxyl group enables further functionalization, such as coupling with amines or other molecules, facilitating the development of targeted therapies, biosensors, and diagnostic tools. It is also employed in nanoparticle coating to enhance stability and prevent aggregation in biological environments.