[Some compounds correlated to pyracrimycin A].

Some biological characteristics of pyracrimycin A (I), a metabolic compound isolated from cultures of Streptomyces eridani are examined. Some other compounds related to I, obtained both by chemical reaction from the natural product and by synthesis are described. The in vitro antibacterial activity seems to be due to the presence of the unsaturated moiety --N equals (see article) --CH equals CH-- (see article) equals O.