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|  | The Anatomical Therapeutic Chemical (ATC) classification system |  | 
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 Level 3
 
 B - Blood and blood forming organsB03 - Antianemic preparationsB03B - Vitamin B12 and Folic Acid
 
 B03BA - Vitamin B12  (cyanocobalamin and analogues)B03BB - Folic Acid and derivatives
 
 
 
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