1,2,2a,3,4,6,7,8-Octahydrocyclopenta[cd]pyren-4-ol is an intermediate in synthesizing Acepyrene (A130950), a novel constituent discovered that belongs to the pyrene class of the polycyclic aromatic hydrocarbons. Acepyrene occurs in a large variety of carbon black soots, in cigarette smoke and is the major representative of PAH in car engine exhaust gases.