All

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 D02 Organic Chemicals D009930 +
  D02.065 Amides D000577 +
   D02.065.884 Sulfonamides D013449 +
    D02.065.884.750 Sumatriptan D018170 
 D02 Organic Chemicals D009930 +
  D02.886 Sulfur Compounds D013457 +
   D02.886.590 Sulfones D013450 +
    D02.886.590.700 Sulfonamides D013449 +
     D02.886.590.700.750 Sumatriptan D018170 
 D03 Heterocyclic Compounds D006571 +
  D03.438 Heterocyclic Compounds, 2-Ring D006574 +
   D03.438.473 Indoles D007211 +
    D03.438.473.880 Sumatriptan D018170