title: Early intermediates in the biosynthesis of ansamycins. III. Isolation and identification of further 8-deoxyansamycins of the rifamycin-type.
abstract: A number of minor compounds were isolated from fermentations of the protorifamycin I producing strain Nocardia mediterranei F 1/24(1,2)) and identified by means of chemical and spectroscopic methods. Two types of structures were identified: Type 1: modified protorifamycins (derived from protorifamycin I) Type 2: defective rifamycins (8-deoxyrifamycins).
mesh_terms: D000900:Anti-Bacterial Agents / Q000096:biosynthesis* / Q000302:isolation & purification / Q000494:pharmacology; D001419:Bacteria / Q000187:drug effects; D002176:Candida albicans / Q000187:drug effects; D055598:Chemical Phenomena; D002621:Chemistry; D005285:Fermentation; D047029:Lactams, Macrocyclic; D009682:Magnetic Resonance Spectroscopy; D009615:Nocardia / Q000378:metabolism*
chemical_list: D000900:Anti-Bacterial Agents; D047029:Lactams, Macrocyclic