mPEG-CM(mPEG-Carboxymethyl), MW 2K is a carboxylic acid-functionalized methoxy polyethylene glycol, one of the single-active PEG derivatives, PEG acid can be used to react with amine groups and peptide coupling reagents .
AxisPharm offers 5000+ PEG Linkers with high purity. Different kinds of PEG Reagents may be available by custom synthesis.