Difficulties involved in the evaluation of quaternary ammonium salts.
D000641:Ammonia; D064751:Ammonium Compounds; D000644:Quaternary Ammonium Compounds; D012492:Salts
D064751:Ammonium Compounds; D000644:Quaternary Ammonium Compounds; D012492:Salts; D000641:Ammonia
AMMONIA AND AMMONIUM COMPOUNDS