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The repeating disaccharide unit of the mucopeptide of the cell wall of Mycobacterium smegmatis contains N-acetyl-glucosamine linked to N-glycolyl-muramic acid. This first identification of N-glycolyl-muramic acid as a natural product has been performed by mass spectrometry of the permethylated disaccharide. N-glycolyl muramic acid has been synthesized: the natural and synthetic products are identical.
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Adam et al. (1969) studied this question.
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