This compound is widely used in bioconjugation and chemical synthesis due to its reactive functional groups. The terminal carboxylic acid allows for easy coupling with amines or alcohols, making it valuable in the modification of peptides, proteins, and other biomolecules. Its PEG (polyethylene glycol) spacer enhances solubility and reduces immunogenicity, making it suitable for drug delivery systems and therapeutic applications. Additionally, the chloride group enables further functionalization or attachment to other molecules, facilitating the creation of complex structures in materials science and nanotechnology. It is also employed in the development of diagnostic tools and biosensors due to its ability to link biomolecules to surfaces or probes.