4-Arm PEG-NH2.HCl (MW 20000)

4-Arm PEG-NH2 HCl (MW 20000) (4-Arm PEG-amine HCL salt (MW 20000) ) is a multi-arm PEG derivative featuring amine groups at the end of each of its four arms, which are connected to a pentaerythritol core. The reactive primary amine or NH2 groups can rapidly react with activated carboxylic acids like NHS esters to form stable amide bonds.