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Three homologs, monactin C41H66O12, dinactin C42H68O12 and trinactin C43H70O12, have been isolated from the mother liquors of the Streptomyces metabolite nonactin C40H64O12. These compounds are macrocyclic tetralactones («macrotetrolides») I of optically active nonactic and homononactic acids. The structure III (R = CH3, R′ = H) determined for homononactic acid C11H20O4 from spectral data and degradation experiments, shows a close relationship to the structure III (R = R′ = H) of the known nonactic acid C10H18O4.
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BECK et al. (1962) studied this question.
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