4-Arm PEG-NH2 (MW 40000)

4-Arm PEG-NH2 (MW 40000) [4-Arm PEG-amine (MW 40000) ] is a multi-arm PEG derivative featuring amine groups at the end of each of the four arms linked 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.