Production of cinerubins by a Streptomyces griseorubiginosus strain.

Streptomyces No. 4915 was isolated and revealed to produce cinerubins A and B. This strain was different from other cinerubins-producing strains. Production of cinerubins is reported. Assignments of the signals of the 13C-NMR spectrum of cinerubin A, the major product, have been made.