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New tetracyclines produced by streptomyces aureofaciens

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1. A COMPOUND SELECTED FROM THE GROUP CONSISTING OF 5A(11A)-DEHYDROTETRACYCLINES OF THE FORMULA:
5. A PROCESS FOR PRODUCING 7-CHLORO-5A(11A)-DEHYDROTETRACYCLINE WHICH COMPRISES CULTIVATING A STRAIN OF STREPTOMYCES AUREOFACIENS SELECTED FROM THE GROUP CONSISTING OF THOSE HAVING AMERICAN TYPE CULTURE COLLECTION ACCESSION NUMBERS 12748, 12749, 12750 AND 12751 IN AN AQUEOUS NUTRIENT MEDIUM CONTAINING ASSIMILABLE SOURCES OF CARBOHYDRATE, NITROGEN AND INORGANIC SALTS AND CONTAINING AT LEAST 50 PARTS PER MILLION OF CHLORIDE IONS, UNDER SUBMERGED AEROBIC CONDITIONS UNTIL SUBSTANTIAL QUANTITIES OF 7-CHLORO-5A(11A)-DEHYDROTETRACYCLINE ARE PRODUCED IN SAID MEDIUM.
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