All

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 D03 Heterocyclic Compounds D006571 +
  D03.383 Heterocyclic Compounds, 1-Ring D006573 +
   D03.383.725 Pyridines D011725 +
    D03.383.725.676 Picolines D010847 +
     D03.383.725.676.635 Pyridoxal D011730 +
      D03.383.725.676.635.600 Pyridoxal Phosphate D011732 
 D08 Enzymes and Coenzymes D045762 +
  D08.211 Coenzymes D003067 +
   D08.211.740 Pyridoxal Phosphate D011732 
 D11 Growth Substances, Pigments, and Vitamins D006134 +
  D11.786 Vitamins D014815 +
   D11.786.708 Vitamin B Complex D014803 +
    D11.786.708.935 Vitamin B 6 D025101 +
     D11.786.708.935.500 Pyridoxal D011730 +
      D11.786.708.935.500.500 Pyridoxal Phosphate D011732