Structure of an antitumor antibiotic,reductiomycin

The structure of an antitumor antibiotic isolated from a variant of $\text{Streptomyces orientalis}$ was established as ($\text{1}$) by chemical and spectral evidence. The antibiotic was found to be identical with reductiomycin, and therefore the structure (X) of reductiomycin previously reported must be revised.