Microorganism capable of producing compounds where pyrrole is fused with 4-oxo-1,3-benzoxazine and method of use as antibacterial and antifungal

Described is a biologically pure culture of a microorganism deposited at the National Collections of Industrial and Marine Bacteria, Aberdeen, Scotland, United Kindgom, under the accession number 40808, which produces any one of the compounds of formula (I), wherein R1 is halogen; R2 is hydrogen or halogen; R3 is an alkyl group of from 1 to 4 carbon atoms; R4 is an hydroxyl or alkoxy group of from 1 to 4 carbon atoms; in a recoverable quantity upon aerobic fermentation in an aqueous nutrient media containing assimilable sources of carbon nitrogen, phosphorus and other essential elements, and processes for the purification of such compounds in a recoverable quantity upon aerobic fermentation in suitable aqueous. The culture and the compounds obtained therefrom are useful as antibacterial or antifungal agents.