Used in bioconjugation and drug delivery systems, it serves as a linker molecule due to its PEG (polyethylene glycol) chain, which enhances solubility and stability. Commonly applied in the development of antibody-drug conjugates (ADCs) and targeted therapies, it facilitates the attachment of drugs or imaging agents to biomolecules like proteins or peptides. Its aldehyde group allows for specific reactions with amines, enabling precise conjugation. Additionally, it is utilized in surface modification of nanoparticles to improve biocompatibility and reduce immunogenicity.