N-Acetyltalosaminuronic acid is a uronic acid. It is a component of pseudopeptidoglycan, a structural polymer found in the cell walls in some types of Archaea. In archaea, the beta-1,3-glycosidic bond links N-acetylglucosamine (NAG) and N-acetyltalosaminuronic (NAT) acid in pseudomurein, providing resistance to lysozyme.