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 +
     D02.455.426.100.080 Bicyclo Compounds D001643 +
      D02.455.426.100.080.100 Biperiden D001712 
 D03 Heterocyclic Compounds D006571 +
  D03.383 Heterocyclic Compounds, 1-Ring D006573 +
   D03.383.621 Piperidines D010880 +
    D03.383.621.110 Biperiden D001712