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Reference.org
Pyrene
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<p>Pyrene is a <a href="/facts/Polycyclic_aromatic_hydrocarbon/K52xSfNC">polycyclic aromatic hydrocarbon</a> (PAH) consisting of four fused <a href="/facts/Benzene/Fguue7nr">benzene</a> rings, resulting in a flat <a href="/facts/Aromaticity/wK0DzRY6">aromatic</a> system. The chemical formula is C16H10. This yellow-green solid is the smallest peri-fused PAH (one where the rings are fused through more than one face). Pyrene forms during <a href="/facts/Combustion/ohQoWj8z">incomplete combustion</a> of organic compounds. </p>