Used primarily in bioconjugation and drug delivery systems, this chemical serves as a linker to attach therapeutic agents to targeting molecules, such as antibodies or peptides. Its polyethylene glycol (PEG) chain enhances solubility and stability, reducing immunogenicity and extending circulation time in the body. The benzyl group provides a protective function, which can be selectively removed to activate the molecule. This compound is particularly valuable in the development of antibody-drug conjugates (ADCs) and targeted cancer therapies, where precise delivery of drugs to specific cells is critical. Additionally, it finds utility in the modification of biomolecules for research and diagnostic applications.