title: Biosynthesis of camptothecin. I. Definition of the overall pathway assisted by carbon-13 nuclear magnetic resonance analysis.
mesh_terms: D002166:Camptothecin / Q000096:biosynthesis*; D002247:Carbon Isotopes; D002250:Carbon Radioisotopes; D009682:Magnetic Resonance Spectroscopy; D008722:Methods; D010946:Plants, Medicinal / Q000378:metabolism; D014316:Tritium
chemical_list: D002247:Carbon Isotopes; D002250:Carbon Radioisotopes; D014316:Tritium; D002166:Camptothecin