m-PEG-Butyraldehyde(MPEG-bALD, MW 20K is a PEG-based PROTAC linker, because PEG polymers with aldehyde end groups, which are reactive with hydrazides or terminal amines of proteins, antibodies, hormones and polypeptides, are commonly used in the PEGylation process.
AxisPharm offers 5000+ PEG Linkers with high purity. Different kinds of PEG Reagents may be available by custom synthesis.