All

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 D03 Heterocyclic Compounds D006571 +
  D03.438 Heterocyclic Compounds, 2-Ring D006574 +
   D03.438.733 Pteridines D011621 +
     D03.438.733.631 Pterins D011622 +
     D03.438.733.900 Triamterene D014223