All

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 D04 Polycyclic Hydrocarbons D011083 +
  D04.615 Polycyclic Hydrocarbons, Aromatic D011084 +
   D04.615.597 Naphthacenes D009279 +
    D04.615.597.900 Tetracyclines D013754 +
     D04.615.597.900.525 Methacycline D008690