NH2-PEG3-C6-Cl（Cat No.:I044625）is a bifunctional polyethylene glycol (PEG) linker with a terminal primary amine and a reactive chloroalkane group, separated by a PEG3 spacer and a six-carbon alkyl chain. The amine group facilitates coupling with carboxylic acids or activated esters, while the chloro group reacts with nucleophiles like thiols or amines, enabling efficient covalent attachment. Its flexible PEG3 segment improves water solubility and reduces steric hindrance. This reagent is widely used in bioconjugation, targeted drug delivery, surface functionalization, and the synthesis of multifunctional molecules or nanoparticles in biomedical research.