This compound is widely used in bioconjugation and pharmaceutical applications due to its reactive tosyl group and polyethylene glycol (PEG) spacer. The tosyl group enables efficient coupling with nucleophiles such as amines, thiols, or hydroxyl groups, making it valuable for modifying proteins, peptides, or other biomolecules. The PEG spacer enhances solubility, reduces immunogenicity, and improves biocompatibility, which is particularly useful in drug delivery systems. It is also employed in the development of antibody-drug conjugates (ADCs) and targeted therapies, where precise and stable linkage between molecules is required. Additionally, it finds use in surface functionalization of nanoparticles and materials for biomedical research.