All

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 D02 Organic Chemicals D009930 +
  D02.092 Amines D000588 +
   D02.092.080 Aminopyridines D000631 +
    D02.092.080.060 4-Aminopyridine D015761 
 D03 Heterocyclic Compounds D006571 +
  D03.383 Heterocyclic Compounds, 1-Ring D006573 +
   D03.383.725 Pyridines D011725 +
    D03.383.725.050 Aminopyridines D000631 +
     D03.383.725.050.060 4-Aminopyridine D015761