Used as a versatile intermediate in organic synthesis, particularly in the preparation of polyethylene glycol (PEG) derivatives. It plays a key role in modifying biomolecules, such as proteins and peptides, to enhance their solubility, stability, and biocompatibility. Commonly applied in drug delivery systems to improve the pharmacokinetics of therapeutic agents. Also utilized in bioconjugation techniques for creating PEGylated compounds, which are essential in developing targeted therapies and reducing immunogenicity in pharmaceuticals.