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|  | The Anatomical Therapeutic Chemical (ATC) classification system |  | 
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 Level 5
 
 A - Alimentary tract and metabolismA16 - Other alimentary tract and metabolism productsA16A - Other alimentary tract and metabolism productsA16AA - Amino acids and derivativesA16AA06 - Betaine
 
 Betaine
 
 
 
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