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 +
       D03.438.733.631.400.600 Pteroylpolyglutamic Acids D011624 
       D03.438.733.631.400.800 Tetrahydrofolates D013763 +
 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 +
      D11.786.708.328.700 Pteroylpolyglutamic Acids D011624 
      D11.786.708.328.850 Tetrahydrofolates D013763 +