Azide-PEG8-alcohol（Cat No.:R017802）is a heterobifunctional polyethylene glycol linker designed for flexible bioconjugation and molecular assembly. It features a terminal azide group for efficient copper-catalyzed or strain-promoted click chemistry with alkynes, and a hydroxyl group that serves as a versatile site for further derivatization, such as ester or carbamate formation. The PEG8 spacer imparts hydrophilicity, flexibility, and reduced steric hindrance, enhancing solubility and biomolecular accessibility in diverse environments. This reagent is widely applied in chemical biology, proteomics, biomaterials, and drug discovery, supporting controlled labeling, surface modification, and multifunctional probe development.