Cyclopenta[cd]pyrene, also known as acepyrene, is a polycyclic aromatic hydrocarbon (PAH). It has a chemical formula of C<small>18</small>H<small>10</small>. It is a member of the group of pyrenes.
It is an aromatic hydrocarbon that consists of five fused rings and is formed during the incomplete combustion of organic matter. It is primarily found in gasoline engine exhaust. This substance is used in laboratory research as a mutagen and carcinogen. It is also reasonably anticipated to be a human carcinogen.
Its molecular weight is 226.3 g/mol. According to the MeSH Pharmacological Classification, it is a mutagen and carcinogen. According to IARC, it is classified as "IARC group 2A" (Probably carcinogenic to humans).