All

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 D02 Organic Chemicals D009930 +
  D02.065 Amides D000577 +
   D02.065.884 Sulfonamides D013449 +
    D02.065.884.725 Sulfanilamides D013424 +
     D02.065.884.725.867 Sulfamethoxazole D013420 +
      D02.065.884.725.867.500 Trimethoprim-Sulfamethoxazole Combination D015662 
 D02 Organic Chemicals D009930 +
  D02.886 Sulfur Compounds D013457 +
   D02.886.590 Sulfones D013450 +
    D02.886.590.700 Sulfonamides D013449 +
     D02.886.590.700.725 Sulfanilamides D013424 +
      D02.886.590.700.725.867 Sulfamethoxazole D013420 +
       D02.886.590.700.725.867.500 Trimethoprim-Sulfamethoxazole Combination D015662 
 D03 Heterocyclic Compounds D006571 +
  D03.383 Heterocyclic Compounds, 1-Ring D006573 +
   D03.383.742 Pyrimidines D011743 +
    D03.383.742.906 Trimethoprim D014295 +
     D03.383.742.906.500 Trimethoprim-Sulfamethoxazole Combination D015662