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 D03 Heterocyclic Compounds D006571 +
  D03.066 Acids, Heterocyclic D000147 +
   D03.066.515 Nicotinic Acids D009539 +
    D03.066.515.530 Niacinamide D009536 +
      D03.066.515.530.500 Nikethamide D009552 
      D03.066.515.530.498 Nicorandil D020108 

 D03 Heterocyclic Compounds D006571 +
  D03.383 Heterocyclic Compounds, 1-Ring D006573 +
   D03.383.725 Pyridines D011725 +
    D03.383.725.547 Nicotinic Acids D009539 +
     D03.383.725.547.530 Niacinamide D009536 +
       D03.383.725.547.530.500 Nikethamide D009552 
       D03.383.725.547.530.498 Nicorandil D020108 

 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 +
     D11.786.708.547.565 Niacinamide D009536 +
       D11.786.708.547.565.050 6-Aminonicotinamide D015120 
       D11.786.708.547.565.498 Nicorandil D020108