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 +
         D02.455.426.559.389.261.190.350 Hexachlorophene D006582 
 D02 Organic Chemicals D009930 +
  D02.755 Phenols D010636 +
   D02.755.190 Chlorophenols D002733 +
     D02.755.190.270 Dichlorophen D004003 
     D02.755.190.350 Hexachlorophene D006582 
     D02.755.190.633 Pentachlorophenol D010416