Used as a hydrophilic linker or spacer in the synthesis of functionalized polymers and bioconjugates. Its polyether chain enhances solubility in aqueous systems, making it valuable in drug delivery platforms where improved bioavailability and circulation time are required. The methanesulfonate end group allows for efficient nucleophilic substitution, enabling conjugation with amines or other nucleophiles in bioactive molecules. Commonly employed in the development of PEG-like constructs for pharmaceuticals, diagnostics, and surface modifications of nanoparticles.