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 +
       D02.455.426.559.389.261.250 Dinitrochlorobenzene D004137 
 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 +
      D02.455.426.559.389.565 Nitrobenzenes D009578 +
       D02.455.426.559.389.565.250 Dinitrochlorobenzene D004137 
 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 +
      D02.455.526.439.202.200 Dinitrochlorobenzene D004137 
 D02 Organic Chemicals D009930 +
  D02.640 Nitro Compounds D009574 +
   D02.640.529 Nitrobenzenes D009578 +
    D02.640.529.240 Dinitrobenzenes D004136 +
     D02.640.529.240.250 Dinitrochlorobenzene D004137 
 D24 Immunologic and Biological Factors D007151 +
  D24.611 Immunologic Factors D007155 +
   D24.611.216 Antigens D000941 +
    D24.611.216.550 Epitopes D000939 +
     D24.611.216.550.480 Haptens D006241 +
      D24.611.216.550.480.350 Dinitrochlorobenzene D004137