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![Benz[a]anthracene Polycyclic aromatic hydrocarbon Benzo[a]pyrene Benzo[c]phenanthrene, carbon monoxide molecule transparent background PNG clipart thumbnail](https://p7.hiclipart.com/preview/399/93/171/benz-a-anthracene-polycyclic-aromatic-hydrocarbon-benzo-a-pyrene-benzo-c-phenanthrene-carbon-monoxide-molecule-thumbnail.jpg "Benz[a]anthracene Polycyclic aromatic hydrocarbon Benzo[a]pyrene Benzo[c]phenanthrene, carbon monoxide molecule transparent background PNG clipart")
