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 +
     D03.438.733.631.202 Biopterin D001708 +
       D03.438.733.631.202.500 Neopterin D019798 
 D08 Enzymes and Coenzymes D045762 +
  D08.211 Coenzymes D003067 +
   D08.211.090 Biopterin D001708 +
     D08.211.090.500 Neopterin D019798 
 D11 Growth Substances, Pigments, and Vitamins D006134 +
  D11.303 Growth Substances D006133 +
   D11.303.180 Biopterin D001708 +
     D11.303.180.500 Neopterin D019798