| abstract |
The presentinvention provides a novel bioactive substancenhaving an antitumor activity and a process for producing it,nand a medical use thereof. Namely, it provides a 12-memberednring macrolide compound represented by the following formulanobtained from the incubation solution of Streptomyces sp. Mer.n11107 or a variant thereof, a pharmacologically acceptable saltnthereof or a hydrate of them, and a process for producing it. |