The isolation and characterization of rubradirin B.

The isolation and characterization of rubradirin B. Protorubradirin, an antibiotic containing a C-nitroso-sugar fragment, is the true secondary metabolite produced by Streptomyces achromogenes var. rubradiris. Rubradirin, described earlier, is its photo-oxidation product. Isolation and Structure Elucidation of Some Components of the Antitumor Antibiotic Mixture ‘Rubiflavin’ Biosynthesis of rubradirin as an ansamycin antibiotic from Streptomyces achromogenes var. rubradiris NRRL3061 New antitumor antibiotics, ditrisarubicins A, B and C. New antitumor antibiotics, ditrisarubicins A, B and C. Isolation and characterization of sarubicin A, a new antibiotic. Rubeomycin, a new anthracycline antibiotic complex. I. Taxonomy of producing organism, isolation, characteriation and biological activities of rubeomycin A, A1, B and B1. Bu-2313, a new antibiotic complex active against anaerobes. II. Structure determination of Bu-2313 A and B. Sarubicin B, a new quinone antibiotic, isolated from the fermentation broth of a Streptomyces strain.