Amine-PEG-amine (NH2-PEG-NH2), MW 3.5K is a Ponsure reactive homobifunctional polyethylene glycol derivative, the amine can react with activated NHS esters to form stable amide bonds.
AxisPharm offers 5000+ PEG Linkers with high purity. Different kinds of PEG Reagents may be available by custom synthesis.