Culture LL-F42248, preliminarily identified as an unusual Streptomyces species, was found to produce the novel antibiotic 1, designated LL-F42248a. This compound, which is related to the coproduced pyrrolomycin C (2)i:) is the first tricyclic member of this family and is the only chiral pyrrolomycin reported to date.2) The culture was grown in a 30-liter tank fer
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