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 +
      D03.132.610.422.106.700 Pentazocine D010423