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 +
      D02.455.426.559.389.261 Chlorobenzenes D002722 +
        D02.455.426.559.389.261.190 Chlorophenols D002733 +
        D02.455.426.559.389.261.220 Dicofol D004010 
        D02.455.426.559.389.261.250 Dinitrochlorobenzene D004137 
        D02.455.426.559.389.261.400 Hexachlorobenzene D006581 
 D02 Organic Chemicals D009930 +
  D02.455 Hydrocarbons D006838 +
   D02.455.526 Hydrocarbons, Halogenated D006846 +
    D02.455.526.439 Hydrocarbons, Chlorinated D006843 +
     D02.455.526.439.202 Chlorobenzenes D002722 +
       D02.455.526.439.202.190 Dicofol D004010 
       D02.455.526.439.202.200 Dinitrochlorobenzene D004137 
       D02.455.526.439.202.400 Hexachlorobenzene D006581