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Level 3
R - Respiratory systemR03 - Drugs for obstructive airway diseasesR03C - Adrenergics for systemic use
R03CA - Alpha- and beta-adrenoreceptor agonistsR03CB - Non-selective beta-adrenoreceptor agonistsR03CC - Selective beta-2-adrenoreceptor agonistsR03CK - Adrenergics and other drugs for obstructive airway diseases
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