This compound is primarily utilized in bioconjugation and protein modification applications. Its structure, featuring an activated ester group, makes it highly reactive with amine groups, enabling efficient coupling with peptides, proteins, or other biomolecules. The polyethylene glycol (PEG) chain in its structure enhances solubility and stability, making it suitable for use in aqueous environments. It is often employed in drug delivery systems to improve the pharmacokinetics of therapeutic agents by increasing their circulation time in the body. Additionally, it is used in the development of PEGylated bioconjugates for targeted therapies, diagnostics, and research applications. Its ability to modify biomolecules without significantly altering their biological activity makes it a valuable tool in biotechnology and pharmaceutical research.