Conclusions
It has been shown that the natural mixture of enniatin antibiotics contains not only enniatins A and B but also two new substances, enniatins A1 and B1, which differ from enniatin A by the fact that in their molecules one or two N-methylisoleucine residues are replaced by one or two N-methylvaline residues.
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Khimiya Prirodnykh Soedinenii, Vol. 4, No. 3, pp. 182–186, 1968
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Kiryushkin, A.A., Rozynov, B.V. & Ovchinnikov, Y.A. A mass spectrometric study of natural mixtures of enniatin antibiotics. Chem Nat Compd 4, 157–160 (1968). https://doi.org/10.1007/BF00565750
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DOI: https://doi.org/10.1007/BF00565750