title: Gas-liquid chromatography of ergocalciferol and cholecalciferol in nanogram quantities.
mesh_terms: D002762:Cholecalciferol / Q000032:analysis*; D002849:Chromatography, Gas; D002855:Chromatography, Thin Layer; D004872:Ergocalciferols / Q000032:analysis*; D004952:Esters / Q000138:chemical synthesis; D007202:Indicators and Reagents; D008722:Methods; D014316:Tritium
chemical_list: D004872:Ergocalciferols; D004952:Esters; D007202:Indicators and Reagents; D014316:Tritium; D002762:Cholecalciferol