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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 +
   D03.438.759 Purines D011687 +
    D03.438.759.758 Purinones D011688 +
     D03.438.759.758.399 Hypoxanthines D007042 +
      D03.438.759.758.399.454 Guanine D006147 +
        D03.438.759.758.399.454.250 Acyclovir D000212 +
        D03.438.759.758.399.454.300 Azaguanine D001375