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During our screening of microbial metabolites for effective drugs against tumor cell lines, we discovered a new pyrano[4',3':6,7]naphtho[1,2-b]xanthene derivative, FD-594 from the fermentation broth of Streptomyces sp. TA-0256. FD-594 shows moderate activity against tumor cell lines, comparative to that of adriamycin, as well as antibacterial activity against some Gram-positive bacteria.

Isolation and Characterization of a New Pyrano(4',3':6,7)naphtho(1,2-b)xanthene Antibiotic FD-594.