All

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 D03 Heterocyclic Compounds D006571 +
  D03.132 Alkaloids D000470 +
   D03.132.610 Opium D009892 +
    D03.132.610.422 Morphinans D009019 +
      D03.132.610.422.106 Benzomorphans D001575 +
      D03.132.610.422.150 Buprenorphine D002047 
      D03.132.610.422.165 Butorphanol D002077 
      D03.132.610.422.235 Dextrorphan D003917 
      D03.132.610.422.250 Diprenorphine D004174 
      D03.132.610.422.270 Etorphine D005048 
      D03.132.610.422.413 Levallorphan D007977 
      D03.132.610.422.463 Levorphanol D007981 +
      D03.132.610.422.547 Morphine D009020 +
      D03.132.610.422.606 Nalbuphine D009266 
      D03.132.610.422.656 Nalorphine D009269 
      D03.132.610.422.706 Naloxone D009270 +
 D03 Heterocyclic Compounds D006571 +
  D03.549 Heterocyclic Compounds with 4 or More Rings D006576 +
   D03.549.686 Morphinans D009019 +
     D03.549.686.150 Buprenorphine D002047 
     D03.549.686.165 Butorphanol D002077 
     D03.549.686.260 Dextrorphan D003917 
     D03.549.686.275 Diprenorphine D004174 
     D03.549.686.320 Etorphine D005048 
     D03.549.686.429 Levallorphan D007977 
     D03.549.686.485 Levorphanol D007981 +
     D03.549.686.575 Morphine D009020 +
     D03.549.686.639 Nalbuphine D009266 
     D03.549.686.694 Nalorphine D009269 
     D03.549.686.750 Naloxone D009270 +
 D03 Heterocyclic Compounds D006571 +
  D03.605 Heterocyclic Compounds, Bridged-Ring D006572 +
   D03.605.497 Morphinans D009019 +
     D03.605.497.150 Buprenorphine D002047 
     D03.605.497.165 Butorphanol D002077 
     D03.605.497.260 Dextrorphan D003917 
     D03.605.497.280 Diprenorphine D004174 
     D03.605.497.320 Etorphine D005048 
     D03.605.497.429 Levallorphan D007977 
     D03.605.497.485 Levorphanol D007981 +
     D03.605.497.575 Morphine D009020 +
     D03.605.497.639 Nalbuphine D009266 
     D03.605.497.694 Nalorphine D009269 
     D03.605.497.750 Naloxone D009270 +