Abstract
Fermentation of deposited cultures ofStreptomyces conglobatus, known to produce the polyether antibiotic, ionomycin has resulted in the isolation and characterization of a second metabolite, conglobatin (C28H38N2O6). X-Ray analysis revealed a dimeric macrolide dilactone structure for conglobatin, similar to the structures of the mold metabolites vermiculin and pyrenophorin, from which the absolute configuration of conglobatin has been inferred. The dimer consists of two molecules of 7-hydroxy-8-oxazoyl-2, 4, 6-trimethyl-2-octenoic acid joined by two ester linkages.
