All

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 D03 Heterocyclic Compounds D006571 +
  D03.605 Heterocyclic Compounds, Bridged-Ring D006572 +
    D03.605.168 Cyclazocine D003496 +
    D03.605.497 Morphinans D009019 +
    D03.605.687 Quinuclidines D011812 +
    D03.605.869 Tropanes D014326 +
    D03.605.084 Bicyclo Compounds, Heterocyclic D019086