m-PEG3-azide（Cat No.:I015788）is a short, monofunctional polyethylene glycol derivative featuring a methoxy group at one end and a terminal azide at the other. The azide functionality enables efficient copper-catalyzed or strain-promoted click chemistry with alkynes, providing site-specific and bioorthogonal conjugation. The PEG3 chain offers hydrophilicity, flexibility, and minimized steric hindrance, improving solubility and reactivity in both aqueous and organic environments. Compact yet effective, m-PEG3-azide is widely applied in chemical biology, imaging, drug delivery, and biomaterials research, serving as a versatile linker for modular assembly and controlled molecular functionalization.