This chemical is widely utilized in the field of organic synthesis, particularly as a versatile reagent for modifying biomolecules. Its primary application lies in the PEGylation process, where it is used to attach polyethylene glycol (PEG) chains to proteins, peptides, or other therapeutic molecules. This modification enhances the stability, solubility, and circulation time of these biomolecules in the body, making it valuable in drug delivery systems. Additionally, it is employed in the development of bioconjugates, where it acts as a linker to connect different functional groups or molecules, enabling targeted delivery or improved therapeutic efficacy. Its tosyl group facilitates efficient coupling reactions, making it a preferred choice in bioconjugation strategies.