SS-PEG-SS (PEG-bis-Succinimidyl Succinate), MW 2K is an amine reactive PEGylation reagent. There is a C2 aliphatic ester bond between the PEG and the NHS ester.
AxisPharm offers 5000+ PEG Linkers with high purity. Different kinds of PEG Reagents may be available by custom synthesis.