Used as a key intermediate in click chemistry, particularly in bioconjugation and polymer science. Its azide group readily participates in copper-catalyzed azide-alkyne cycloaddition (CuAAC) reactions, enabling efficient attachment to alkyne-functionalized molecules. Commonly employed in modifying biomolecules, such as proteins and nucleic acids, for labeling, imaging, or immobilization on surfaces. Also utilized in the synthesis of functional polymers and dendrimers where controlled architecture and terminal reactivity are required. Its triethylene glycol-based linker provides water solubility and flexibility, reducing non-specific binding and improving bioavailability in biological applications.