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© May 2005 Lorentz JÄNTSCHI && Sorana Daniela BOLBOACĂ

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 D02 Organic Chemicals D009930 +
  D02.442 Hydrazines D006834 +
   D02.442.925 Todralazine D014032 


 D03 Heterocyclic Compounds D006571 +
  D03.383 Heterocyclic Compounds, 1-Ring D006573 +
   D03.383.710 Pyridazines D011724 +
    D03.383.710.605 Phthalazines D010793 +
     D03.383.710.605.925 Todralazine D014032