This chemical is widely used in bioconjugation and protein modification processes due to its reactive ester group, which facilitates efficient coupling with amino groups in biomolecules. It is particularly valuable in the synthesis of PEGylated compounds, where it acts as a linker to attach polyethylene glycol (PEG) chains to proteins, peptides, or other therapeutic agents. This PEGylation enhances the stability, solubility, and bioavailability of the conjugated molecules, making it a critical tool in drug delivery systems. Additionally, it is employed in the development of diagnostic reagents and bioconjugate vaccines, where precise and stable conjugation is essential for functionality. Its water-soluble PEG chain further improves the pharmacokinetic properties of the resulting conjugates, making it suitable for various biomedical applications.