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Urdamycin B is a glycoside bacterial metabolite that has been found in S. fradiae and has antibacterial and anticancer activities.1 It is active against Gram-positive and Gram-negative bacteria and inhibits proliferation of L1210 leukemia cells (IC50 = 2.4 μg/ml).

1.Drautz, H., Z?hner, H., Rohr, J., et al.Metabolic products of microorganisms. 234. Urdamycins, new angucycline antibiotics from Streptomyces fradiae. I. Isolation, characterization and biological propertiesJ. Antibiot. (Tokyo)39(12)1657-1669(1986)

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