m-PEG3-4-nitrophenyl carbonate contains a nitrophenyl carbonate moiety. Nitrophenyl carbonate readily reacts with amine bearing molecules to form a stable carbamate. It can be used to label lysine residues. The hydrophilic PEG linker can increase the water solubility of the compound.
AxisPharm offers 5000+ PEG Linkers with high purity. Different kinds of PEG Reagents may be available by custom synthesis.