A new thiolactone containing antibiotic 834-B1 was isolated from the culture broth of Streptomyces sp. Y-0834H which has also produced thiolactomycin and thiotetromycin at the same time. The structure of 834-B1 was determined as I by the decoupling experiment in NMR.
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Sato et al. (1989) studied this question.
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