trans-7,8-Dihydroxy-7,8-dihydrobenzo[a]pyrene is a metabolite of Benzopyrene (B205800). Benzo[a]pyrene (B205800), a prototypic PAH, is metabolized by cytochrome P 450 1A1/1B1. (-)-trans-7,8-Dihydroxy-7,8-dihydrobenzo[a]pyrene (D452280) undergoes further P 4501A1/1B1-mediated metabolism to a carcinogen, which forms DNA-adducts primarily with 2'-deoxyguanosine. A carcinogen.