All

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 D02 Organic Chemicals D009930 +
  D02.455 Hydrocarbons D006838 +
   D02.455.426 Hydrocarbons, Cyclic D006844 +
     D02.455.426.100 Bridged Compounds D001952 +
     D02.455.426.392 Hydrocarbons, Alicyclic D006840 +
     D02.455.426.559 Hydrocarbons, Aromatic D006841 +