Synthesis of quaternary salts of heterocyclic nitrogen compounds preliminary to the use of labeled compounds in the study of cancer chemotherapy.
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D006571:Heterocyclic Compounds; D009369:Neoplasms; D009584:Nitrogen; D017672:Nitrogen Compounds; D012492:Salts
D006571:Heterocyclic Compounds; D017672:Nitrogen Compounds; D012492:Salts; D009584:Nitrogen