Widely used in bioconjugation and chemical synthesis, it serves as a linker or spacer molecule in the development of drug delivery systems, particularly in antibody-drug conjugates (ADCs). Its hydrophilic PEG chain enhances solubility and reduces immunogenicity, making it valuable in improving the pharmacokinetics of therapeutic agents. Additionally, it is utilized in the modification of peptides, proteins, and other biomolecules to enhance their stability and bioavailability. In material science, it is employed to functionalize surfaces or nanoparticles for targeted applications in diagnostics and therapeutics. Its role in facilitating controlled release and targeted delivery systems underscores its importance in modern pharmaceutical and biomedical research.