All

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 D02 Organic Chemicals D009930 +
  D02.455 Hydrocarbons D006838 +
   D02.455.326 Hydrocarbons, Acyclic D006839 +
    D02.455.326.146 Alkanes D000473 +
     D02.455.326.146.379 Ethane D004980 +
      D02.455.326.146.379.350 Ethylene Dichlorides D005025 
 D02 Organic Chemicals D009930 +
  D02.455 Hydrocarbons D006838 +
   D02.455.526 Hydrocarbons, Halogenated D006846 +
    D02.455.526.439 Hydrocarbons, Chlorinated D006843 +
     D02.455.526.439.458 Ethylene Dichlorides D005025