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The Anatomical Therapeutic Chemical (ATC) classification system
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Level 4
R - Respiratory systemR03 - Drugs for obstructive airway diseasesR03D - Other systemic drugs for obstructive airway diseasesR03DB - Xanthines and adrenergics
R03DB01 - Diprophylline and adrenergicsR03DB02 - Choline Theophyllinate and adrenergicsR03DB03 - Proxyphylline and adrenergicsR03DB04 - Theophylline and adrenergicsR03DB05 - Aminophylline and adrenergicsR03DB06 - Etamiphylline and adrenergics
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