All

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 D02 Organic Chemicals D009930 +
  D02.640 Nitro Compounds D009574 +
   D02.640.600 Nitrofurans D009581 +
    D02.640.600.566 Nitrofurantoin D009582 
 D03 Heterocyclic Compounds D006571 +
  D03.383 Heterocyclic Compounds, 1-Ring D006573 +
   D03.383.312 Furans D005663 +
    D03.383.312.649 Nitrofurans D009581 +
     D03.383.312.649.566 Nitrofurantoin D009582