Intensely potent anthracycline antibiotic oxaunomycin produced by a blocked mutant of the daunorubicin-producing microorganism.

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Abstract
A new potent anthracycline antibiotic oxaunomycin was isolated from the culture broth of a blocked mutant derived from a baumycin producer and was identified as 7-O-(.alpha.-L-daunosaminyl)-.beta.-rhodomycinone. It exhibited about 100 times more strongly cytotoxic activity against leukemic L1210 cell culture than doxorubicin.