This chemical is primarily used in the field of bioconjugation and surface modification. It serves as a linker or spacer molecule in the development of drug delivery systems, enabling the attachment of therapeutic agents to targeting molecules or nanoparticles. Its PEG (polyethylene glycol) chain enhances solubility and reduces immunogenicity, making it suitable for biomedical applications. Additionally, it is employed in the functionalization of surfaces, such as metal oxides, to improve biocompatibility and stability in biosensors or implantable devices. Its phosphonic acid group allows strong binding to metal surfaces, making it valuable in nanotechnology and material science for creating stable coatings or hybrid materials.