title: AA-57, a new antibiotic related to pentalenolactone.
mesh_terms: D000900:Anti-Bacterial Agents / Q000302:isolation & purification* / Q000494:pharmacology; D001419:Bacteria / Q000187:drug effects; D055598:Chemical Phenomena; D002621:Chemistry; D007783:Lactones / Q000302:isolation & purification / Q000494:pharmacology; D009682:Magnetic Resonance Spectroscopy; D013302:Streptomyces / Q000032:analysis
chemical_list: D000900:Anti-Bacterial Agents; D007783:Lactones