4-Arm PEG-NH2 (MW 10000) (4-Arm PEG-amine (MW 10000)) is a multi-arm PEG derivative featuring amine groups at the end of each of its four arms, which are attached to a pentaerythritol core. The reactive primary amine (NH2) groups can rapidly react with activated carboxylic acids, such as NHS esters, to form stable amide bonds.
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