specificity was exhibited when sugar and sugar derivatives were used as competitors in the radioimmunoassay : a 51-fold range of competitive ability was found , and sialic acids ( n-acetylneuraminic acid and n-glycollylneuraminic acid ) and colominic acid ( a polymer of n-acetylneuraminic acid ) were the best competitors .
C0037025
sialic acids
C0067762
n-acetylneuraminic