Used as a bifunctional linker in organic synthesis and bioconjugation, particularly in pharmaceutical and polymer research. The terminal hydroxyl group allows for coupling reactions, while the bromine end readily undergoes substitution with nucleophiles such as amines or thiols. This enables the attachment of active molecules, dyes, or polymers in drug delivery systems and surface functionalization. Its long, flexible polyether chain improves solubility in aqueous and polar environments, making it suitable for use in PEGylation and the development of water-soluble conjugates. Commonly applied in the preparation of functionalized nanoparticles and diagnostic probes.