4-Arm PEG-NH2 HCl (MW 40000) (4-Arm PEG-amine HCL salt (MW 40000)) is a multi-arm PEG derivative featuring amino groups at the termini of its four arms connected to a pentaerythritol core. The reactive primary amine, or NH2 group, readily reacts with activated carboxylic acids such as NHS esters to form stable amide bonds.
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