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 D03 Heterocyclic Compounds D006571 +
  D03.066 Acids, Heterocyclic D000147 +
   D03.066.515 Nicotinic Acids D009539 +
    D03.066.515.950 Xanthinol Niacinate D014971 

 D03 Heterocyclic Compounds D006571 +
  D03.383 Heterocyclic Compounds, 1-Ring D006573 +
   D03.383.725 Pyridines D011725 +
    D03.383.725.547 Nicotinic Acids D009539 +
     D03.383.725.547.950 Xanthinol Niacinate D014971 

 D03 Heterocyclic Compounds D006571 +
  D03.438 Heterocyclic Compounds, 2-Ring D006574 +
   D03.438.759 Purines D011687 +
    D03.438.759.758 Purinones D011688 +
     D03.438.759.758.824 Xanthines D014970 +
      D03.438.759.758.824.751 Theophylline D013806 +
       D03.438.759.758.824.751.950 Xanthinol Niacinate D014971