All

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 D03 Heterocyclic Compounds D006571 +
  D03.066 Acids, Heterocyclic D000147 +
   D03.066.349 Isonicotinic Acids D007539 +
    D03.066.349.600 Pyridoxic Acid D011735 
 D03 Heterocyclic Compounds D006571 +
  D03.383 Heterocyclic Compounds, 1-Ring D006573 +
   D03.383.725 Pyridines D011725 +
    D03.383.725.394 Isonicotinic Acids D007539 +
     D03.383.725.394.700 Pyridoxic Acid D011735 
 D03 Heterocyclic Compounds D006571 +
  D03.383 Heterocyclic Compounds, 1-Ring D006573 +
   D03.383.725 Pyridines D011725 +
    D03.383.725.705 Picolinic Acids D010848 +
     D03.383.725.705.645 Pyridoxic Acid D011735