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By a combination of chemical and spectroscopic (XH and 13C NMR)studies the structure of a glycopeptide antibiotic eremomycin has been elucidated. It is closely related to vancomycin, but differs in sugar and chlorine content. The eremomycinaglycone contains monodechlorovancomycinic acid; the only chlorine atom is situated in the second amino acid after the TV-terminal amino acid residue of the peptide. The sugar part is composed of glucose and two residues of an amino sugar shown to be 2,3,6-trideoxy-3-amino-C-3-methyl-L-flraZ?z>2o-hexopyranose (4-

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