All

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 D02 Organic Chemicals D009930 +
  D02.640 Nitro Compounds D009574 +
   D02.640.139 Aristolochic Acids D034341 
 D04 Polycyclic Hydrocarbons D011083 +
  D04.615 Polycyclic Hydrocarbons, Aromatic D011084 +
   D04.615.723 Phenanthrenes D010616 +
    D04.615.723.089 Aristolochic Acids D034341