m-PEG-azide, MW 5K is a PEG-based PROTAC linker, which is an azide-containing PEG polymer that can be used to modify proteins, peptides, and other materials. Azido groups can react with copper-catalyzed alkynes in aqueous solution. It is also easily reduced to an amine group.
AxisPharm offers 5000+ PEG Linkers with high purity. Different kinds of PEG Reagents may be available by custom synthesis.