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Structures of 5,7-di-N-acetyllegionaminic acid (Leg5,7Ac2, 1), legionaminic acid (Leg, 2), N-acetylneuraminic acid (Neu5Ac, 3), and 2,4-diacetamido-2,4,6-trideoxy-D-mannose (6deoxyManNAc4NAc, 4) which is the six-carbon biosynthetic precursor of Leg5,7Ac2 (1).
