title: Extraction of secondary and tertiary ammonium ion pairs with dibenzo-18-crown-6 as adduct-forming agent.
mesh_terms: D001555:Benzene Derivatives; D002626:Chemistry, Pharmaceutical; D004988:Ethers, Cyclic; D000644:Quaternary Ammonium Compounds / Q000032:analysis*
chemical_list: D001555:Benzene Derivatives; D004988:Ethers, Cyclic; D000644:Quaternary Ammonium Compounds