All

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 D03 Heterocyclic Compounds D006571 +
  D03.494 Heterocyclic Compounds, 3-Ring D006575 +
   D03.494.046 Acridines D000166 +
    D03.494.046.250 Aminoacridines D000609 +
     D03.494.046.250.177 Acriflavine D000167