M. Ueki et al., UK-2A, UK-2B, UK-2C AND UK-2D, NOVEL ANTIFUNGAL ANTIBIOTICS FROM STREPTOMYCES SP-517-02 .1. FERMENTATION, ISOLATION, AND BIOLOGICAL PROPERTIES, Journal of antibiotics, 49(7), 1996, pp. 639-643
Novel antifungal antibiotics, UK-2A, B and a mixture of C and D, were
obtained from the mycelial cake of Streptomyces sp. 517-02. All of the
UK-2 compounds were similar in structure to antimycin A. The antifung
al activities of UK-2 compunds were as strong as that of antimycin A.
However, the UK-2 compounds demonstrated weak cytotoxicity compared to
antimycin A.