Acid-PEG1-NHS ester is a PEG linker containing a carboxylic acid and an NHS ester. The terminal carboxylic acid can react with primary amine groups in the presence of activators (e.g. HATU). The NHS ester can be used to label the primary amines (-NH2) of proteins, amine-modified oligonucleotides, and other amine-containing molecules.
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