title: Letter: Utilization of 13C-13C coupling in structural and biosynthetic studies. IV. Penicillic acid.
mesh_terms: D002244:Carbon; D002247:Carbon Isotopes; D055598:Chemical Phenomena; D002621:Chemistry; D010397:Penicillanic Acid / Q000096:biosynthesis*; D010407:Penicillium / Q000378:metabolism
chemical_list: D002247:Carbon Isotopes; D002244:Carbon; D010397:Penicillanic Acid