The molecule is the ketoaldonic acid derivative that is N-acetylneuraminic acid after formal dehydroxylation and subsequent removal of C-8 and C-9. It derives from a N-acetylneuraminic acid.
(4S,5R,6R)-5-acetamido-2,4-dihydroxy-6-(hydroxymethyl)oxane-2-carboxylic acid