This chemical is widely used in the field of bioconjugation, particularly for modifying proteins, peptides, and other biomolecules. Its primary application involves attaching polyethylene glycol (PEG) chains to these molecules, a process known as PEGylation. This modification enhances the solubility, stability, and bioavailability of the biomolecules, making them more effective in therapeutic applications. It is especially valuable in drug delivery systems, where it helps reduce immunogenicity and prolong the circulation time of drugs in the body. Additionally, it is utilized in research for labeling and tracking biomolecules in various biochemical assays and diagnostic tools. Its maleimide group allows for specific and efficient conjugation to thiol-containing compounds, making it a versatile tool in both pharmaceutical development and biological studies.