m-PEG-Succinimidyl Glutarate(mPEG-SG), MW 30K is a C4 aliphatic ester bond between PEG and NHS ester. Reacts with primary amine groups in pH7-8.5 buffers.
AxisPharm offers 5000+ PEG Linkers with high purity. Different kinds of PEG Reagents may be available by custom synthesis.