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 Medical Concepts
  Chemicals and Drugs
 Heterocyclic Compounds
 Heterocyclic Compounds, Bridged-Ring
 Morphinans
 Buprenorphine
 Butorphanol
 Dextromethorphan
 Dextrorphan
 Diprenorphine
 Etorphine
 Levallorphan
 Levorphanol
 Morphine
 Nalbuphine
 Nalorphine
 Naloxone

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