All

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 D02 Organic Chemicals D009930 +
  D02.640 Nitro Compounds D009574 +
   D02.640.672 Nitroimidazoles D009593 +
    D02.640.672.700 Ornidazole D009950 
 D03 Heterocyclic Compounds D006571 +
  D03.383 Heterocyclic Compounds, 1-Ring D006573 +
   D03.383.374 Imidazoles D007093 +
    D03.383.374.658 Nitroimidazoles D009593 +
     D03.383.374.658.700 Ornidazole D009950