m-PEG-Butyraldehyde, MW 30K is an aldehyde PEG polymer, PEG aldehyde or ketone derivatives can be used for reversible PEGylation by their reaction with hydrazine or hydrazide to form hydrolyzed acylhydrazone bonds. PEG butyraldehyde can be provided by custom synthesis.
AxisPharm offers 5000+ PEG Linkers with high purity. Different kinds of PEG Reagents may be available by custom synthesis.