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The Anatomical Therapeutic Chemical (ATC) classification system
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Level 4
  
P - Antiparasitic products, insecticides and repellentsP02 - AnthelminticsP02C - Antinematodal agentsP02CB - Piperazine and derivatives
  
P02CB01 - PiperazineP02CB02 - Diethylcarbamazine
  
 
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