All

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 D02 Organic Chemicals D009930 +
  D02.455 Hydrocarbons D006838 +
   D02.455.426 Hydrocarbons, Cyclic D006844 +
    D02.455.426.559 Hydrocarbons, Aromatic D006841 +
     D02.455.426.559.389 Benzene Derivatives D001555 +
      D02.455.426.559.389.097 Benzenesulfonates D001557 +
       D02.455.426.559.389.097.280 Ferrozine D005297 
 D02 Organic Chemicals D009930 +
  D02.886 Sulfur Compounds D013457 +
   D02.886.645 Sulfur Acids D013456 +
    D02.886.645.600 Sulfonic Acids D013451 +
     D02.886.645.600.080 Arylsulfonic Acids D017739 +
      D02.886.645.600.080.050 Arylsulfonates D001190 +
       D02.886.645.600.080.050.100 Benzenesulfonates D001557 +
        D02.886.645.600.080.050.100.325 Ferrozine D005297 
 D03 Heterocyclic Compounds D006571 +
  D03.383 Heterocyclic Compounds, 1-Ring D006573 +
   D03.383.931 Triazines D014227 +
    D03.383.931.320 Ferrozine D005297