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 D03 Heterocyclic Compounds D006571 +
  D03.383 Heterocyclic Compounds, 1-Ring D006573 +
   D03.383.757 Pyrroles D011758 +
    D03.383.757.840 Tetrapyrroles D045725 +
     D03.383.757.840.500 Porphyrins D011166 +
      D03.383.757.840.500.640 Metalloporphyrins D008665 +
       D03.383.757.840.500.640.587 Heme D006418 +
         D03.383.757.840.500.640.587.462 Hemin D006427 

 D03 Heterocyclic Compounds D006571 +
  D03.549 Heterocyclic Compounds with 4 or More Rings D006576 +
   D03.549.909 Tetrapyrroles D045725 +
    D03.549.909.500 Porphyrins D011166 +
     D03.549.909.500.640 Metalloporphyrins D008665 +
      D03.549.909.500.640.587 Heme D006418 +
        D03.549.909.500.640.587.462 Hemin D006427 

 D11 Growth Substances, Pigments, and Vitamins D006134 +
  D11.557 Pigments D010860 +
   D11.557.727 Porphyrins D011166 +
    D11.557.727.640 Metalloporphyrins D008665 +
     D11.557.727.640.587 Heme D006418 +
       D11.557.727.640.587.462 Hemin D006427