DSPE-PEG-Amine, MW 3400 (ammonium), is a phosphoethanolamine involved in the synthesis of liposomal delivery systems. The compound's amino group can be converted into an aromatic aldehyde to react with acetone-protected aromatic hydrazine on the surface of bovine carbonic anhydrase (BCA) molecules. Liposomes are formed by creating bis-arylhydrazone (BAH) linkages with the target enzyme molecules, resulting in a liposome-BAH-BCA conjugate that can catalyze the hydration of carbon dioxide into bicarbonate.