All

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 D03 Heterocyclic Compounds D006571 +
  D03.494 Heterocyclic Compounds, 3-Ring D006575 +
   D03.494.953 Xanthenes D014966 +
    D03.494.953.704 Thioxanthenes D013892 +
     D03.494.953.704.450 Hycanthone D006826