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DC-52, C18H22N2O4, is a new antitumor antibiotic produced by Streptomyces melanovinaceus nov. sp. The structure of DC-52 has been determined by consideration of spectral data. It has the novel skeleton, 8,11-iminoazepinoisoquinoline.

DC-52, a novel antitumor antibiotic. 2. Isolation, physico-chemical characteristics and structure determination.