Used as a key reagent in click chemistry, particularly in copper-catalyzed azide-alkyne cycloaddition (CuAAC) reactions. Its azide group readily reacts with alkynes to form stable triazole linkages, making it valuable for bioconjugation, polymer modification, and surface functionalization. Commonly employed in pharmaceutical research to attach payloads or labels to biomolecules such as proteins and nucleic acids. Also utilized in material science to create functional coatings, hydrogels, and smart polymers due to its hydrophilic polyether chain and reactive azide end group. The solution form enhances handling and solubility in common organic and aqueous solvents, facilitating its use in multi-step syntheses and labeling applications.