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© May 2005 Lorentz JÄNTSCHI && Sorana Daniela BOLBOACĂ

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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 +
     D03.438.733.631.825 Xanthopterin D014976 


 D11 Growth Substances, Pigments, and Vitamins D006134 +
  D11.557 Pigments D010860 +
   D11.557.831 Pterins D011622 +
    D11.557.831.742 Xanthopterin D014976