title: Gas chromatographic determination of camphorsulphonic acid and its salts in pharmaceutical preparations.
mesh_terms: D002164:Camphor / Q000032:analysis*; D002626:Chemistry, Pharmaceutical; D002849:Chromatography, Gas; D004952:Esters / Q000032:analysis; D008722:Methods; D008745:Methylation; D013451:Sulfonic Acids / Q000032:analysis*
chemical_list: D004952:Esters; D013451:Sulfonic Acids; D002164:Camphor