Used in bioconjugation to link biomolecules with high precision, this compound enables the creation of stable, water-soluble conjugates for therapeutic and diagnostic applications. Its multi-arm PEG structure enhances solubility and reduces immunogenicity, making it ideal for drug delivery systems, particularly in targeted therapies and antibody-drug conjugates. The maleimide group selectively reacts with thiol groups, allowing site-specific modification of proteins and peptides. It is also employed in surface functionalization of nanoparticles and medical devices to improve biocompatibility and circulation time.