A new secondary metabolite was detected in the culture filtrate and extracts of Streptomyces violaceusniger Tü 4113 by HPLC-diode-array and HPLC-electrospray-mass-spectrometry screening. The compound named spirofungin has a polyketide-spiroketal structure and shows various antifungal activities, particularly against yeasts.
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Höltzel et al. (1998) studied this question.
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