4-Arm PEG-NH2 (MW 20000)

4-Arm PEG-NH2 (MW 20000) (also known as 4-Arm PEG-amine (MW 20000) ) is a multi-arm PEG derivative featuring amine groups on each terminus of its four arms, which are connected to a pentaerythritol core. The reactive primary amine or NH2 groups readily react with activated carboxylic acids, such as NHS esters, to form stable amide bonds.