m-PEG4-azide linker contains an azide group. The azide group can react with alkyne, BCN, DBCO via Click Chemistry to yield a stable triazole linkage. The mPEG modification increases the aqueous solubility of the resulting compound.
AxisPharm offers 5000+ PEG Linkers with high purity. Different kinds of PEG Reagents may be available by custom synthesis.