(+-)-3b,4a-Dihydrobenzo(1,2)pyreno(4,5-b)oxirene 64437-52-1 Benzo(1,2)pyreno(4,5-b)oxirene, 3b,4a-dihydro- Benzo(1,2)pyreno(4,5-b)oxirene, 3b,4a-dihydro-, (+-)-