Azide-PEG6-Tos（Cat No.:I016023）is a heterobifunctional polyethylene glycol linker featuring an azide group on one end and a tosyl (Tos) leaving group on the other, connected by a six-unit PEG spacer. The azide moiety enables efficient bioorthogonal click chemistry reactions, such as CuAAC and SPAAC, for stable conjugation with alkyne-bearing molecules. The tosyl group acts as an excellent leaving group for nucleophilic substitution, offering versatile functionalization options. The PEG6 backbone enhances solubility, flexibility, and biocompatibility. This reagent is widely applied in bioconjugation, drug design, and materials science to build multifunctional molecular architectures.