title: Synthesis of (4- 14 C) ergosterol and (4- 14 C) ergocalciferol.
mesh_terms: D002247:Carbon Isotopes; D004872:Ergocalciferols / Q000138:chemical synthesis*; D007553:Isotope Labeling; D008722:Methods; D014807:Vitamin D / Q000138:chemical synthesis*
chemical_list: D002247:Carbon Isotopes; D004872:Ergocalciferols; D014807:Vitamin D