All

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 D02 Organic Chemicals D009930 +
  D02.455 Hydrocarbons D006838 +
   D02.455.526 Hydrocarbons, Halogenated D006846 +
    D02.455.526.439 Hydrocarbons, Chlorinated D006843 +
     D02.455.526.439.224 Chloroform D002725 
       D02.455.526.439.224.200 Bromotrichloromethane D001975 
 D02 Organic Chemicals D009930 +
  D02.455 Hydrocarbons D006838 +
   D02.455.526 Hydrocarbons, Halogenated D006846 +
    D02.455.526.913 Trihalomethanes D022882 +
     D02.455.526.913.810 Chloroform D002725