This compound is widely utilized in bioconjugation and drug delivery systems due to its ability to link biomolecules, such as proteins or peptides, to other molecules or surfaces. Its polyethylene glycol (PEG) spacer enhances solubility and reduces immunogenicity, making it ideal for improving the pharmacokinetics of therapeutic agents. The maleimide group allows for specific and stable thiol conjugation, commonly used to attach cysteine-containing proteins or peptides. Additionally, the terminal carboxylic acid group enables further functionalization, facilitating the creation of complex drug delivery platforms or targeted therapies. Its applications extend to the development of antibody-drug conjugates (ADCs), targeted cancer therapies, and diagnostic probes.