Abstract
Antibacterial metabolites isolated from a submerged culture of the ascomycete Nannizzia cajetani AJELLO grown on wort medium were spectroscopically identified as dimeric naphthoquinone derivatives xanthomegnin (I), viomellein (II), 3,4-dehydroxanthomegnin (III) and two, not previously described pigments: 3',4'-dehydroviomellein (IV) and 3,4,3',4'-bisdehydroxanthomegnin (V).
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