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 +
       D02.455.426.559.389.150.750 Styrenes D013343 +
        D02.455.426.559.389.150.750.800 Styrene D020058 +
         D02.455.426.559.389.150.750.800.830 Polystyrenes D011137 
 D25 Biomedical and Dental Materials D001697 +
  D25.720 Polymers D011108 +
   D25.720.716 Plastics D010969 +
    D25.720.716.579 Polystyrenes D011137 
      D25.720.716.579.159 Cholestyramine D002792