Used in bioconjugation and drug delivery systems, it serves as a linker molecule to attach therapeutic agents, such as drugs or proteins, to polyethylene glycol (PEG) chains. This enhances the solubility, stability, and circulation time of the therapeutic compounds in the body. It is particularly valuable in the development of antibody-drug conjugates (ADCs) and targeted therapies, where precise delivery of drugs to specific cells or tissues is crucial. Additionally, it finds application in modifying peptides and proteins for improved pharmacokinetic properties in pharmaceutical research.