mPEG-CM(mPEG-Carboxymethyl), MW 20K is a linear monofunctional polyethylene glycol acid reagent. PEG acids can be used to react with amine groups with peptide coupling reagents such as NHS and DCC, EDC.
AxisPharm offers 5000+ PEG Linkers with high purity. Different kinds of PEG Reagents may be available by custom synthesis.