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 +
      D02.455.426.559.389.150 Benzylidene Compounds D001597 +
       D02.455.426.559.389.150.700 Stilbenes D013267 +
        D02.455.426.559.389.150.700.175 Diethylstilbestrol D004054 +
         D02.455.426.559.389.150.700.175.450 Hexestrol D006589