| abstract |
A compound of the formula: <IMAGE> wherein R1 and R2 are the same or different and each represents hydrogen or methyl and X is <IMAGE> provided that when R1 is hydrogen, R2 is hydrogen or methyl and X is <IMAGE> and when R1 is methyl, R2 is methyl and X is <IMAGE> is produced by cultivating a a microorganism belonging to the genus Streptomyces in a culture medium. Said compound is useful as an antimicrobial agent and so forth. |