BE-32030 A, B, C, D and E, New Antitumor Substances Produced by Nocardia sp. A32030.

BE-32030 A, B, C, D and E, New Antitumor Substances Produced by Nocardia sp. A32030. New Cytotoxic Agents, BE-54238A and B, Produced by a Streptomycete. A New Antitumor Antibiotic, BE-19412A, Produced by a Streptomycete. A new antitumor substance, BE-13793C, produced by a streptomycete. Taxonomy, fermentation, isolation, structure determination and biological activity. A new antitumor substance, BE-18591, produced by a streptomycete. I. Fermentation, isolation, physico-chemical and biological properties. NA22598Al, a Novel Antitumor Substance Produced by Streptomyces sp. NA22598. A new topoisomerase II inhibitor, BE-22179, produced by a streptomycete. I. Producing strain, fermentation, isolation and biological activity. Sandramycin, a novel antitumor antibiotic produced by a Nocardioides sp. Production, isolation, characterization and biological properties. A new topoisomerase-II inhibitor, BE-10988, produced by a streptomycete. I. Taxonomy, fermentation, isolation and characterization. A new topoisomerase-II inhibitor, BE-10988, produced by a streptomycete. I. Taxonomy, fermentation, isolation and characterization.