7,12-dimethyltetraphene hepatocarcinogenesis dependent chemical compound 7,12-dimethyltetraphene [hepatocarcinogenesis] 7,12-dimethylbenz(a)anthracene 7,12-dimethylbenzo[a]anthracene A tetraphene having methyl substituents at the 7- and 12-positions. It is a potent carcinogen and is present in tobacco smoke. C20H16 CAS:57-97-6 Cc1c2ccccc2c(C)c2c1ccc1ccccc21 DMBA PMID:1596892