All

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 D03 Heterocyclic Compounds D006571 +
  D03.438 Heterocyclic Compounds, 2-Ring D006574 +
   D03.438.786 Quinazolines D011799 +
    D03.438.786.910 Tetrodotoxin D013779 
 D24 Immunologic and Biological Factors D007151 +
  D24.185 Biological Factors D001685 +
   D24.185.926 Toxins D014118 +
    D24.185.926.580 Marine Toxins D008387 +
     D24.185.926.580.910 Tetrodotoxin D013779