N-(Amino-PEG4)-N-bis(PEG4-Azide) is a three-armed PEG linker containing two azide groups and a primary amine. The two azides are free for click chemistry with terminal alkynes or strained cyclooctynes such as DBCO or BCN while the primary amine is reactive towards carboxylic acids and other carbonyl-containing functional groups. The junction combining this molecule's branches is a tertiary amine.
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