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 +
      D02.455.426.100.080.085 Bicyclo Compounds, Heterocyclic D019086 
 D03 Heterocyclic Compounds D006571 +
  D03.438 Heterocyclic Compounds, 2-Ring D006574 +
   D03.438.260 Bicyclo Compounds, Heterocyclic D019086 
     D03.438.260.825 Penicillins D010406 +
 D03 Heterocyclic Compounds D006571 +
  D03.605 Heterocyclic Compounds, Bridged-Ring D006572 +
   D03.605.084 Bicyclo Compounds, Heterocyclic D019086 
     D03.605.084.737 Penicillins D010406 +
     D03.605.084.750 Ramipril D017257