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From a mixture of substances formed by producing strains of Streptomyces aureofaciens under conditions of submerged fermentation a new metabolite, ekatetrone, was isolated. Its isolation and basic physical and chemical data are described. Ekatetrone is a quinone derivative with a carboxamide group. In tests in vitro with cells of Ehrlich's ascites tumour evidence was provided that ekatetrone inhibits proteo- and nucleosynthesis.

Isolation of ekatetrone, a new metabolite of producing variants of Streptomyces aureofaciens.