title: Analysis of pharmaceutical preparations by direct densitometry of thin-layer chromatograms. I. Quaternary bases: choline.
mesh_terms: D002712:Chlorides; D002794:Choline / Q000032:analysis*; D002855:Chromatography, Thin Layer; D003035:Cobalt; D003720:Densitometry; D005295:Ferrocyanides; D008722:Methods; D011188:Potassium
chemical_list: D002712:Chlorides; D005295:Ferrocyanides; D003035:Cobalt; D002794:Choline; D011188:Potassium