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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 diseasesR03DB - Xanthines and adrenergicsR03DB06 - Etamiphylline and adrenergics
Etamiphylline and adrenergics
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