4-Arm-PEG-Azide (MW 1000) (4-Arm-PEG-N3 (MW 1000)) is a PEG derivative composed of PEG units and azide groups. It contains azide groups that can undergo copper-catalyzed azide-alkyne cycloaddition (CuAAC) with alkyne-containing molecules. Additionally, it can participate in strain-promoted azide-alkyne cycloaddition (SPAAC) with molecules containing DBCO or BCN groups.
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