All

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 D03 Heterocyclic Compounds D006571 +
  D03.383 Heterocyclic Compounds, 1-Ring D006573 +
   D03.383.606 Piperazines D010879 +
    D03.383.606.810 Prospidium D011447 
 D04 Polycyclic Hydrocarbons D011083 +
  D04.615 Polycyclic Hydrocarbons, Aromatic D011084 +
   D04.615.885 Spiro Compounds D013141 +
    D04.615.885.700 Prospidium D011447