All

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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 +
     D03.383.757.840.437 Corrinoids D045728 +
      D03.383.757.840.437.777 Vitamin B 12 D014805 +
       D03.383.757.840.437.777.560 Hydroxocobalamin D006879 
 D03 Heterocyclic Compounds D006571 +
  D03.549 Heterocyclic Compounds with 4 or More Rings D006576 +
   D03.549.909 Tetrapyrroles D045725 +
    D03.549.909.437 Corrinoids D045728 +
     D03.549.909.437.777 Vitamin B 12 D014805 +
      D03.549.909.437.777.560 Hydroxocobalamin D006879 
 D11 Growth Substances, Pigments, and Vitamins D006134 +
  D11.786 Vitamins D014815 +
   D11.786.708 Vitamin B Complex D014803 +
    D11.786.708.950 Vitamin B 12 D014805 +
     D11.786.708.950.560 Hydroxocobalamin D006879