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D15 Central Nervous System Agents D002491 +
D15.153 Antitussive Agents D000996
D21 Anti-Allergic and Respiratory System Agents D018944 +
D21.760 Respiratory System Agents D019141 +
D21.760.090 Antitussive Agents D000996
D27 Chemical Actions and Uses D020164 +
D27.505 Pharmacologic Actions D020228 +
D27.505.954 Therapeutic Uses D045506 +
D27.505.954.033 Anti-Allergic and Respiratory System Agents D018944 +
D27.505.954.033.760 Respiratory System Agents D019141 +
D27.505.954.033.760.090 Antitussive Agents D000996
D27 Chemical Actions and Uses D020164 +
D27.505 Pharmacologic Actions D020228 +
D27.505.954 Therapeutic Uses D045506 +
D27.505.954.427 Central Nervous System Agents D002491 +
D27.505.954.427.153 Antitussive Agents D000996