All

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 D03 Heterocyclic Compounds D006571 +
  D03.494 Heterocyclic Compounds, 3-Ring D006575 +
   D03.494.953 Xanthenes D014966 +
    D03.494.953.852 Xanthones D044004 +
      D03.494.953.852.777 Sterigmatocystin D013241