4arm-PEG-Maleimide, MW 20K is a thiol reactive multiarm PEG polymer. Maleimides react with thiols or sulfhydryl-containing molecules at pH 6.5 to 7.5 via formation of stable thioether bond.
AxisPharm offers 5000+ PEG Linkers with high purity. Different kinds of PEG Reagents may be available by custom synthesis.