Ald-CH2-PEG5-azide is a click chemistry crosslinker containing an azide group and an aldehyde group. The azide group enables PEGylation via Click Chemistry. PEG5 arm increases solubility in aqueous media. The aldehyde group reacts with amines and the N-terminal of peptides and proteins to form an imine containing a C=N double bond, which can be further reduced.
