This compound is widely used in bioconjugation and drug delivery systems due to its polyethylene glycol (PEG) spacer, which enhances solubility and reduces immunogenicity. It is particularly valuable in linking bioactive molecules, such as peptides, proteins, or drugs, to other entities like antibodies or nanoparticles. The maleimide group allows for selective conjugation with thiol-containing molecules, enabling precise and efficient coupling in biological applications. Its PEG chain provides a hydrophilic environment, improving stability and prolonging circulation time in vivo. This makes it a critical component in the development of targeted therapies, diagnostic agents, and advanced biopharmaceuticals.