All

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 D03 Heterocyclic Compounds D006571 +
  D03.066 Acids, Heterocyclic D000147 +
   D03.066.515 Nicotinic Acids D009539 +
    D03.066.515.475 Niacin D009525 
 D03 Heterocyclic Compounds D006571 +
  D03.383 Heterocyclic Compounds, 1-Ring D006573 +
   D03.383.725 Pyridines D011725 +
    D03.383.725.547 Nicotinic Acids D009539 +
     D03.383.725.547.475 Niacin D009525 
 D11 Growth Substances, Pigments, and Vitamins D006134 +
  D11.786 Vitamins D014815 +
   D11.786.708 Vitamin B Complex D014803 +
    D11.786.708.547 Nicotinic Acids D009539 +
     D11.786.708.547.500 Niacin D009525