Used as a bifunctional linker in bioconjugation and polymer chemistry, enabling the connection of two molecular entities through terminal bromine groups. The long PEG chain provides flexibility, solubility in aqueous and organic solvents, and reduced nonspecific binding. Commonly employed in the synthesis of PEGylated drugs, dendrimers, and functionalized surfaces. Its extended spacer arm minimizes steric hindrance, making it ideal for constructing molecular architectures in pharmaceutical research and materials science.