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Streptoverticillium fervens produced a new antibiotic, FR-900848, which has a high specific activity against filamentous fungi. Purified by solvent extraction and column chromatography, the compound appears as colorless crystals. Its structure is C32H43N3O6, which consists of 5'-amino-5'-deoxy-5,6-dihydrouridine with an unsaturated fatty acid having unprecedented four serial and one isolated cyclopropane rings.
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Yoshida et al. (1990) studied this question.