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fluoranthene benzofluorene polycyclic aromatic hydrocarbon pah naphthalene benzene five-membered ring aromatic aromaticity macrocyclic heterocyclic heterocycle polycyclic ring pyrene fluorescence incomplete combustion coal tar pitch tar pollutant carcinogen persistent bioaccumulative toxic pbt biodegradation poison venom toxicant toxicity toxin poisoning danger harmful cancer carcinogenicity carcinogenic carcinogenesis promotion molecule molecular formula skeletal structural structure 3d