- Neuraminic acid derivatives newly discovered in humans: N-acetyl-9-O-L-lactoylneuraminic acid, N,9-O-Diacetylneuraminic acid and N-acetyl-2,3-dehydro-2-deoxyneuraminic acid. Haverkamp, J., Schauer, R., Wember, M. Hoppe-Seyler's Z. Physiol. Chem. (1976)