title: Biosynthesis of the ionophorous antibiotic A23187.
mesh_terms: D000900:Anti-Bacterial Agents / Q000096:biosynthesis*; D000001:Calcimycin / Q000032:analysis / Q000096:biosynthesis*; D055598:Chemical Phenomena; D002621:Chemistry; D009682:Magnetic Resonance Spectroscopy; D013302:Streptomyces / Q000378:metabolism*
chemical_list: D000900:Anti-Bacterial Agents; D000001:Calcimycin