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 +
      D03.438.733.631.192 Aminopterin D000630 +
      D03.438.733.631.202 Biopterin D001708 +
      D03.438.733.631.400 Folic Acid D005492 +
      D03.438.733.631.825 Xanthopterin D014976 
 D11 Growth Substances, Pigments, and Vitamins D006134 +
  D11.557 Pigments D010860 +
   D11.557.831 Pterins D011622 +
     D11.557.831.742 Xanthopterin D014976