All

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 D03 Heterocyclic Compounds D006571 +
  D03.132 Alkaloids D000470 +
   D03.132.610 Opium D009892 +
    D03.132.610.422 Morphinans D009019 +
     D03.132.610.422.547 Morphine D009020 +
      D03.132.610.422.547.547 Morphine Derivatives D009022 +
        D03.132.610.422.547.547.149 Codeine D003061 +
        D03.132.610.422.547.547.267 Heroin D003932 
        D03.132.610.422.547.547.350 Dihydromorphine D004090 
        D03.132.610.422.547.547.450 Hydromorphone D004091 
        D03.132.610.422.547.547.430 Ethylmorphine D005036 
        D03.132.610.422.547.547.692 Oxymorphone D010111 
        D03.132.610.422.547.547.856 Thebaine D013797 
 D03 Heterocyclic Compounds D006571 +
  D03.549 Heterocyclic Compounds with 4 or More Rings D006576 +
   D03.549.686 Morphinans D009019 +
    D03.549.686.575 Morphine D009020 +
     D03.549.686.575.547 Morphine Derivatives D009022 +
       D03.549.686.575.547.204 Codeine D003061 +
       D03.549.686.575.547.332 Heroin D003932 
       D03.549.686.575.547.420 Dihydromorphine D004090 
       D03.549.686.575.547.500 Hydromorphone D004091 
       D03.549.686.575.547.460 Ethylmorphine D005036 
       D03.549.686.575.547.851 Thebaine D013797 
 D03 Heterocyclic Compounds D006571 +
  D03.605 Heterocyclic Compounds, Bridged-Ring D006572 +
   D03.605.497 Morphinans D009019 +
    D03.605.497.575 Morphine D009020 +
     D03.605.497.575.547 Morphine Derivatives D009022 +
       D03.605.497.575.547.204 Codeine D003061 +
       D03.605.497.575.547.332 Heroin D003932 
       D03.605.497.575.547.420 Dihydromorphine D004090 
       D03.605.497.575.547.500 Hydromorphone D004091 
       D03.605.497.575.547.460 Ethylmorphine D005036 
       D03.605.497.575.547.851 Thebaine D013797