m-PEG-Succinimidyl Carbonate (MPEG-SC), MW 20K is an activated PEG polymer for amine coupling in bioconjugation chemistry. The hydrolysis of NHS-ester competes with the reaction in aqueous solution and increases with increasing pH.
AxisPharm offers 5000+ PEG Linkers with high purity. Different kinds of PEG Reagents may be available by custom synthesis.