All

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 D03 Heterocyclic Compounds D006571 +
  D03.066 Acids, Heterocyclic D000147 +
   D03.066.515 Nicotinic Acids D009539 +
    D03.066.515.635 Pipemidic Acid D010876 
 D03 Heterocyclic Compounds D006571 +
  D03.383 Heterocyclic Compounds, 1-Ring D006573 +
   D03.383.606 Piperazines D010879 +
    D03.383.606.765 Pipemidic Acid D010876 
 D03 Heterocyclic Compounds D006571 +
  D03.383 Heterocyclic Compounds, 1-Ring D006573 +
   D03.383.725 Pyridines D011725 +
    D03.383.725.547 Nicotinic Acids D009539 +
     D03.383.725.547.635 Pipemidic Acid D010876