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 
       D02.455.426.100.080.085 Bicyclo Compounds, Heterocyclic D019086 
 D04 Polycyclic Hydrocarbons D011083 +
  D04.075 Bridged Compounds D001952 +
   D04.075.080 Bicyclo Compounds D001643