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Structures of N-acetylneuraminic acid (Neu5Ac, 1), the most abundant natural sialic acid form, and its naturally occurring O-acetylated forms 7-O-acetyl-N-acetylneuraminic acid (Neu5,7Ac2, 2) and 7,9-di-O-acetyl-N-acetylneuraminic acid (Neu5,7,9Ac3, 3).
