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Level 3
R - Respiratory System
R01 - Nasal Preparations
R01A - Decongestants and Other Nasal Preparations for Topical Use
R01AA - Sympathomimetics, plain
R01AB - Sympathomimetics, combinations excl. corticosteroids
R01AC - Antiallergic agents, excl. corticosteroids
R01AD - Corticosteroids
R01AX - Other nasal preparations
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