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 +
     D03.438.733.631.400 Folic Acid D005492 +
      D03.438.733.631.400.800 Tetrahydrofolates D013763 +
        D03.438.733.631.400.800.350 Formyltetrahydrofolates D005575 
 D08 Enzymes and Coenzymes D045762 +
  D08.211 Coenzymes D003067 +
   D08.211.840 Tetrahydrofolates D013763 +
     D08.211.840.300 Formyltetrahydrofolates D005575 
 D11 Growth Substances, Pigments, and Vitamins D006134 +
  D11.786 Vitamins D014815 +
   D11.786.708 Vitamin B Complex D014803 +
    D11.786.708.328 Folic Acid D005492 +
     D11.786.708.328.850 Tetrahydrofolates D013763 +
       D11.786.708.328.850.350 Formyltetrahydrofolates D005575