All

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 D03 Heterocyclic Compounds D006571 +
  D03.383 Heterocyclic Compounds, 1-Ring D006573 +
   D03.383.621 Piperidines D010880 +
    D03.383.621.160 Cyproheptadine D003533 +
      D03.383.621.160.500 Loratadine D017336 
 D04 Polycyclic Hydrocarbons D011083 +
  D04.615 Polycyclic Hydrocarbons, Aromatic D011084 +
   D04.615.181 Benzocycloheptenes D001567 +
    D04.615.181.384 Dibenzocycloheptenes D003986 +
     D04.615.181.384.340 Cyproheptadine D003533 +
       D04.615.181.384.340.500 Loratadine D017336