m-PEG-Succinimidyl Succinate(m-PEG-SS), MW 30K is a degradable cleavable ester linker between the PEG polymer chain and NHS ester, which can react with amine molecules to form stable amide bonds.
AxisPharm offers 5000+ PEG Linkers with high purity. Different kinds of PEG Reagents may be available by custom synthesis.