4-ARMPEG-NH2 (four Arm Polyethylene Glycol Amine)

4-ARMPEG-NH2 (four armed polyethylene glycol amine) is a multi armed peg derivative. At each end of the four arms, there is a pentaerythritol core with amino groups. Reactive primary amines or NH2 groups can quickly react with activated carboxylic acids such as NHS esters to form stable amide bonds.