N-Desthiobiotin-N-bis(PEG4-Acid) is a PEG linker containing two carboxylic acid groups and desthiobiotin, which is a modified form of biotin that binds to avidin, streptavidin and other biotin-binding protein-based affinity columns are recognized by anti-biotin antibodies. The terminal carboxylic acid can react with primary amine groups in the presence of activators (e.g. HATU).
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