Used in bioconjugation and drug delivery systems, it serves as a linker molecule to connect therapeutic agents with targeting moieties. Its hydrophilic PEG (polyethylene glycol) chains enhance solubility and stability of conjugated compounds, reducing immunogenicity and prolonging circulation time in the body. Commonly applied in the development of antibody-drug conjugates (ADCs) and nanoparticle-based drug delivery platforms. It also finds use in modifying surfaces of biomaterials to improve biocompatibility and reduce protein adsorption.