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|  | The Anatomical Therapeutic Chemical (ATC) classification system |  | 
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 Level 3
 
 N - Nervous systemN02 - AnalgesicsN02C - Antimigraine preparations
 
 N02CA - Ergot alkaloidsN02CB - Corticosteroid derivativesN02CC - Selective serotonin (5HT1) agonistsN02CX - Other antimigraine preparations
 
 
 
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