| abstract |
ANTIBIOTIC TAN-420, ITS PRODUCTION AND PRODUCER Abstract of the Disclosure A compound of the formula: wherein R1 and R2 are the same or different and each represents hydrogen or methyl and X is or provided that when R1 is hydrogen, R2 is hydrogen or methyl and X is or , and when R1 is methyl, R2 is methyl and X is , is produced by cultivating a a microorganism belonging to the genus Steptomyces in a culture medium. Said compound is useful as an antimicrobial agent and so forth. |