2-((Azido-PEG4-carbamoyl)methoxy)acetic acid represents a bifunctional PEG linker containing a terminal azide on one end to conjugate with alkyne-bearing entities and a terminal carboxylic acid on the other end to react with amines via activators (e.g., HATU). The PEG4 units improve the solubility of the compound in aqueous media.
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