we describe here the isolation , purification , and structural characterization of a lipid a precursor synthesized under nonpermissive conditions by a mutant of salmonella typhimurium conditionally defective in the synthesis of the 3-deoxy-d-mannoctulosonate ( 2-keto-3-deoxyoctonate , kdo ) region of the lipopolysaccharide .
C0023767
a lipid
C0023810
lipopolysaccharide