NH2-PEG2-C6-Cl（Cat No.:I044719）is a heterobifunctional linker featuring a primary amine, a short PEG2 (diethylene glycol) spacer, and a six-carbon alkyl chain terminating in a chloro group. The amine group enables coupling to carboxylic acids or activated esters, while the terminal chloro group allows for nucleophilic substitution with thiols or amines. The PEG2 spacer improves water solubility and reduces steric hindrance, while the C6 chain adds hydrophobic character and structural flexibility. This reagent is ideal for designing drug conjugates, modifying surfaces, and building multifunctional biomolecules in chemical biology and targeted delivery research.