All

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 D03 Heterocyclic Compounds D006571 +
  D03.132 Alkaloids D000470 +
   D03.132.610 Opium D009892 +
    D03.132.610.422 Morphinans D009019 +
     D03.132.610.422.706 Naloxone D009270 +
       D03.132.610.422.706.550 Naltrexone D009271 
 D03 Heterocyclic Compounds D006571 +
  D03.549 Heterocyclic Compounds with 4 or More Rings D006576 +
   D03.549.686 Morphinans D009019 +
    D03.549.686.750 Naloxone D009270 +
      D03.549.686.750.550 Naltrexone D009271 
 D03 Heterocyclic Compounds D006571 +
  D03.605 Heterocyclic Compounds, Bridged-Ring D006572 +
   D03.605.497 Morphinans D009019 +
    D03.605.497.750 Naloxone D009270 +
      D03.605.497.750.550 Naltrexone D009271