All

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 D03 Heterocyclic Compounds D006571 +
  D03.383 Heterocyclic Compounds, 1-Ring D006573 +
   D03.383.725 Pyridines D011725 +
    D03.383.725.762 Pyridinium Compounds D011726 +
     D03.383.725.762.232 Cetylpyridinium D002594