the lipid a fractions , obtained by mild acid hydrolysis of the lipopolysaccharides , contained phosphorylated glucosamine residues substituted with dodecanoic , hexadecanoic , 2 hydroxydodecanoic , 3-hydroxydecanoic , and 3-hydroxydodecanoic acids ( hexadecanoic acid and 2-hydroxdodecanoic acid were absent from one lipid a ) .
C0023810
lipopolysaccharides
C0023767
lipid a