4arm PEG Acetic Acid (4-arm AA), MW 10K is a multi-armed PEG derivative with carboxylic acid groups at each end of the four arms attached to a pentaerythritol core, the four-armed polyethylene glycol is Synthesized by ethoxylation of pentaerythritol.
AxisPharm offers 5000+ PEG Linkers with high purity. Different kinds of PEG Reagents may be available by custom synthesis.