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  • Title: Helvecardins A and B, novel glycopeptide antibiotics. II. Structural elucidation.
    Author: Takeuchi M, Takahashi S, Inukai M, Nakamura T, Kinoshita T.
    Journal: J Antibiot (Tokyo); 1991 Mar; 44(3):271-7. PubMed ID: 2026551.
    Abstract:
    Helvecardins A and B, which are produced by Pseudonocardia compacta subsp. helvetica, are new members of glycopeptide antibiotics. They contain the same pseudoaglycone as beta-avoparcin and the same compositions of neutral sugar, amino sugar, and amino acid except that 2'-O-methylrhamnose was detected in helvecardins instead of rhamnose in beta-avoparcin, and mannose was not detected in helvecardin B. From these results and 1H NMR and mass spectral analyses, helvecardins A and B were determined beta-avoparcin 2'-O-methylated on rhamnose and demanosylhelvecardin A, respectively.
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