All

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 D03 Heterocyclic Compounds D006571 +
  D03.383 Heterocyclic Compounds, 1-Ring D006573 +
   D03.383.694 Pyrazoles D011720 +
    D03.383.694.700 Phenylbutazone D010653 +
      D03.383.694.700.640 Oxyphenbutazone D010113 
      D03.383.694.700.670 Prenazone D011298 
      D03.383.694.700.800 Sulfinpyrazone D013442