A new antifungal antibiotic was isolated from the fermentation broth of Streptolnrces sp. 5140-A1. Degradation studies of the crystalline antibiotic, m.p. 186-188°C, C21H28O8N2, suggested its structure to be deisovaleryl-blastmycin. It exhibited antimicrobial activity against Piricularia oryzae and less toxicity against killifish than antimycin A-blastmycin antibiotics.
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Ishiyama et al. (1976) studied this question.
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