All

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 D04 Polycyclic Hydrocarbons D011083 +
  D04.615 Polycyclic Hydrocarbons, Aromatic D011084 +
    D04.615.050 Acenaphthenes D000073 
    D04.615.117 Anthracenes D000873 +
    D04.615.181 Benzocycloheptenes D001567 +
    D04.615.389 Fluorenes D005449 +
    D04.615.486 Indenes D007192 +
    D04.615.597 Naphthacenes D009279 +
    D04.615.638 Naphthalenes D009281 +
    D04.615.723 Phenanthrenes D010616 +
    D04.615.799 Pyrenes D011721 +
    D04.615.885 Spiro Compounds D013141 +
    D04.615.680 Phenalenes D043803