1961.-two sialic acids , n-acetylneuraminic acid and n,7-o-diacetylneuraminic acid , were obtained in crude mixtures from whole cells of escherichia coli and from its endotoxin by weak acid hydrolysis followed by anion exchange resin chromatography .
C0037025
sialic acids
C0067762
n-acetylneuraminic acid