This compound is primarily utilized in the field of bioconjugation and drug delivery systems. Its structure, featuring a polyethylene glycol (PEG) linker and a phosphonic acid ethyl ester group, makes it highly effective for modifying biomolecules. The PEG segment enhances solubility and stability, while the phosphonic acid ethyl ester can be used for attaching to metal oxides or other surfaces, making it valuable in creating targeted drug delivery platforms. Additionally, it is employed in the development of biocompatible coatings for medical devices, improving their performance and reducing adverse reactions in biological systems.