N-(Propargyl-PEG4)-biocytin is a biotin derivative with a PEG4 spacer and terminal alkyne. It combines strong biotin–streptavidin binding with click chemistry reactivity specifically for targeted labeling, drug delivery, and multifunctional bioconjugation.
Polyethylene Glycol PEG Linkers > Biotin PEG > Biotin alkyne PEG
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