in salmonella minnesota lipopolysaccharide the lipid a backbone , a substituted diphosphorylated beta 1,6-linked d-glucosamine disaccharide molecule , carries approximately seven residues of fatty acids : one each of dodecanoic , hexadecanoic , d-3-hydroxytetradecanoic and d-3-o- ( tetradecanoyl ) -tetradecanoic acid in ester linkage and two of d-3-hydroxytetradecanoic acid in amide linkage .
C0023810
lipopolysaccharide
C0023767
lipid a