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 +
      D02.455.426.559.389.115 Benzhydryl Compounds D001559 +
       D02.455.426.559.389.115.475 Meclizine D008468 
 D03 Heterocyclic Compounds D006571 +
  D03.383 Heterocyclic Compounds, 1-Ring D006573 +
   D03.383.606 Piperazines D010879 +
    D03.383.606.650 Meclizine D008468