FR-900109 is a new antibiotic obtained from fermentation broth of a streptomyces which was identified as Streptomyces prunicolor. Its elementary analysis and mass spectroscopic measurement suggest that the molecular formula is C27H32O9. It has an ultraviolet absorption maximum at 254 nm. The antibiotic is active against Gram-positive bacteria. Acute toxicity in mice is very low.
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