mPEG-TCO, MW 2,000 is a polyPEG reagent comprised of a TCO group that specifically and efficiently reacts with tetrazine. The hydrophilic 2k PEG polymer increases the solubility of compounds in aqueous media. The half-life of TCO is short as it will naturally isomerize into CCO (cis-cycloctene) and lose the reactivity. TCO compound is not recommended for long term storage.
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