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 D02 Organic Chemicals D009930 +
  D02.092 Amines D000588 +
   D02.092.471 Ethylamines D005021 +
    D02.092.471.320 Diphenhydramine D004155 +
     D02.092.471.320.250 Dimenhydrinate D004111 

 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 +
      D02.455.426.559.389.115 Benzhydryl Compounds D001559 +
       D02.455.426.559.389.115.250 Diphenhydramine D004155 +
        D02.455.426.559.389.115.250.250 Dimenhydrinate D004111 

 D03 Heterocyclic Compounds D006571 +
  D03.438 Heterocyclic Compounds, 2-Ring D006574 +
   D03.438.759 Purines D011687 +
    D03.438.759.758 Purinones D011688 +
     D03.438.759.758.824 Xanthines D014970 +
      D03.438.759.758.824.751 Theophylline D013806 +
       D03.438.759.758.824.751.162 Dimenhydrinate D004111