Used extensively in bioconjugation and chemical synthesis, it serves as a linker molecule to attach functional groups or drugs to biomolecules like proteins or peptides. Its PEG (polyethylene glycol) spacer enhances solubility and reduces immunogenicity, making it valuable in drug delivery systems. The tosyl (OTs) group acts as a reactive handle, enabling efficient coupling with nucleophiles such as amines or thiols. This compound is particularly useful in antibody-drug conjugates (ADCs) and targeted therapies, where precise and stable connections between components are critical. Additionally, it finds applications in surface modification and material science for creating functionalized surfaces or nanoparticles.