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amazon.com, Quaternary ammonium compounds

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Quaternary compounds (3)
Pharmaceuticals (2)
Alcohols (1)
Chlorides (1)
Cholinergics (1)
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L-carnitine (541-15-1)  
Carnitine  ·  Vitamin BT  ·  Levocarnitine
Carnitine (β-hydroxy-γ-N-trimethylaminobutyric acid, 3-hydroxy-4-N,N,N- trimethylaminobutyrate) is a quaternary ammonium compound involved in metabolism in most mammals, plants and some bacteria. Carnitine may exist in two isomers, labeled D-carnitine and L-carnitine, as they are optically active. At room temperature, pure carnitine is a white powder, and a water-soluble zwitterion with low toxicity.
choline (62-49-7)  
Choline Chloride  ·  Choline Bitartrate  ·  Choline Citrate
Choline is a water-soluble vitamin-like essential nutrient. It is a basic constituent of lecithin, which is present in many plants and animal organs. The term cholines refers to the class of quaternary ammonium salts containing the N,N,N-trimethylethanolammonium cation (X− on the right denotes an undefined counteranion).
benzethonium chloride (5929-09-9, 121-54-0)  
Benzethonium  ·  Phemerol  ·  Hyamine 1622
Benzethonium chloride, also known as hyamine is a synthetic quaternary ammonium salt. This compound is an odorless white solid, soluble in water. It has surfactant, antiseptic, and anti-infective properties, and it is used as a topical antimicrobial agent in first aid antiseptics.
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Quaternary ammonium compounds