4-Arm PEG-NH2 (MW 5000)

4-Arm PEG-NH2 (MW 5000) (4-Arm PEG-amine (MW 5000) ) is a multi-arm PEG derivative featuring amine groups at the termini of each of the four arms attached to a pentaerythritol core. The reactive primary amine or NH2 groups can rapidly react with activated carboxylic acids, such as NHS esters, to form stable amide bonds.