Azido-PEG2-C2-acid（Cat No.:R037812）is a short, bifunctional polyethylene glycol linker featuring an azide group at one end and a terminal carboxylic acid separated by a two-carbon (C2) spacer and two PEG units. The PEG2 chain enhances solubility and flexibility, while the C2 spacer provides structural adaptability for conjugation. The azide moiety enables efficient click chemistry reactions such as CuAAC or SPAAC, and the carboxyl group supports amide coupling with amines. Commonly used in bioconjugation, drug design, and materials science, it facilitates the creation of multifunctional biomolecules and advanced therapeutic systems.