Used in bioconjugation and drug delivery systems, it serves as a linker molecule to connect drugs, proteins, or other biomolecules. Its hydrophilic PEG chain enhances solubility and reduces immunogenicity, making it suitable for therapeutic applications. It is also employed in the development of antibody-drug conjugates (ADCs) and targeted therapies, improving the stability and efficacy of the payload. Additionally, it is utilized in research for modifying surfaces or nanoparticles to enhance biocompatibility and functionality.