All

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 D02 Organic Chemicals D009930 +
  D02.442 Hydrazines D006834 +
   D02.442.436 Isoniazid D007538 
 D03 Heterocyclic Compounds D006571 +
  D03.066 Acids, Heterocyclic D000147 +
   D03.066.349 Isonicotinic Acids D007539 +
    D03.066.349.410 Isoniazid D007538 
 D03 Heterocyclic Compounds D006571 +
  D03.383 Heterocyclic Compounds, 1-Ring D006573 +
   D03.383.725 Pyridines D011725 +
    D03.383.725.394 Isonicotinic Acids D007539 +
     D03.383.725.394.582 Isoniazid D007538