4-Arm PEG-NH2 (MW 20000) (also known as 4-Arm PEG-amine (MW 20000)) is a multi-arm PEG derivative featuring amine groups on each terminus of its four arms, which are connected to a pentaerythritol core. The reactive primary amine or NH2 groups readily react with activated carboxylic acids, such as NHS esters, to form stable amide bonds.
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