4-Arm PEG-NH2 HCl (MW 10000) [4-Arm PEG-amine HCL salt (MW 10000)] is a multi-arm PEG derivative with amine groups attached to the end of each of the four arms connected to a pentaerythritol core. The reactive primary amine (NH2) groups can swiftly react with activated carboxylic acids, such as NHS esters, to form stable amide bonds.
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