NHS ester-PEG4-Amide-Tri(3-methoxypropanamide-PEG4-Azide) Methane functions as a branched PEG linker with an amine-reactive NHS ester moiety and three terminal azides for copper-catalyzed click chemistry with alkyne, BCN, DBCO. Solubility in aqueous media is enhances via the PEG spacers.
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