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DBCO-PEG4-Biotin (ADIBO-NH-PEG2-Biotin) is an azadibenzocyclooctyne-biotin derivative containing a biotin moiety and 4 PEGs.DBCO-PEG4-Biotin is a versatile biotinylation reagent that introduces a portion of biotin into an azide-labelled biomolecule via a copper-free catalytic alkyl azide reaction (SPAAC). azide-labelled biomolecules via a copper-free catalytic alkyl azide reaction (SPAAC).