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|  | The Anatomical Therapeutic Chemical (ATC) classification system |  | 
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 Level 5
 
 R - Respiratory systemR03 - Drugs for obstructive airway diseasesR03D - Other systemic drugs for obstructive airway diseasesR03DA - XanthinesR03DA06 - Etamiphylline
 
 Etamiphylline
 
 
 
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