Used in bioconjugation and drug delivery systems, it acts as a linker to attach therapeutic agents or targeting moieties to biomolecules, enhancing solubility and stability. Commonly applied in PEGylation of proteins, peptides, and nanoparticles to prolong circulation time in the body and reduce immunogenicity. Also utilized in the development of hydrogels and controlled-release formulations for pharmaceutical and biomedical applications.