New Rhodomycin Analogs, SS-288A and SS-288B, Produced by aStreptomyces violaceusA262 Mutant

New Rhodomycin Analogs, SS-288A and SS-288B, Produced by a<i>Streptomyces violaceus</i>A262 Mutant Anthracycline metabolites from Streptomyces violaceus A262. I. Isolation of antibiotic-blocked mutants from Streptomyces violaceus A262. Anthracycline metabolites from Streptomyces violaceus A262. I. Isolation of antibiotic-blocked mutants from Streptomyces violaceus A262. Anthracycline metabolites from Streptomyces violaceus A262. II. New anthracycline epelmycins produced by a blocked mutant strain SU2-730. Anthracycline metabolites from Streptomyces violaceus A262. II. New anthracycline epelmycins produced by a blocked mutant strain SU2-730. Anthracycline metabolites from Streptomyces violaceus A262. III. New anthracycline obelmycins produced by a variant strain SE2-2385. Anthracycline metabolites from Streptomyces violaceus A262. IV. New anthracycline yellamycins produced by a variant strain SC-7. RS-22A, B and C: New Macrolide Antibiotics from Streptomyces violaceusniger. I. Taxonomy, Fermentation, Isolation and Biological Activities. Iso‐rhodomycin A, ein neues Antibioticum aus Streptomyces purpurascens, Rhodomycine, III. Mitteil.¹⁾; Antibiotica aus Actinomyceten, XXXII. Mitteil²⁾ Isolation of New Anthracyclines 10-O-Rhodosaminyl .BETA.-Rhodomycinone and .BETA.-Isorhodomycinone from Mild-acid Treated Culture of Obelmycin-producing Stereptomyces violaceus.