The present invention relates to a novel group of compounds having antibiotic,antifungal and/or cytostatic properties, which are obtainable frommyxobacteria, especially of the genus Sorangium, preferably Sorangiumcellulosum. One representative of this group of compoundsis currently namedDisorazole Z and Disorazole Z-epoxide, respectively, with specificsubstituents and specific unsaturated bonds to its cyclic core structure (I)and (II).