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 +
      D02.455.426.559.389.832 Toluene D014050 +
       D02.455.426.559.389.832.180 Bromphenol Blue D001978 
 D02 Organic Chemicals D009930 +
  D02.755 Phenols D010636 +
   D02.755.150 Bromphenol Blue D001978 
 D02 Organic Chemicals D009930 +
  D02.886 Sulfur Compounds D013457 +
   D02.886.590 Sulfones D013450 +
    D02.886.590.887 Tosyl Compounds D014105 +
     D02.886.590.887.180 Bromphenol Blue D001978