N-(Methyltetrazine-PEG4)-N-Biotin-PEG4-acid is a branched biotinylation tool that enables copper-free click chemistry with a carboxyic acid group and a TCO reactive reagent. The inverse-electron demand Diels-Alder cycloaddition reaction of TCO with tetrazines is the fastest bioorthogonal reaction with exceptional selectivity. Reagent grade, for research use only.
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