4b,5a-Dihydrobenzo(3,4)phenanthro(1,2-b)oxirene 60692-90-2 Benzo(3,4)phenanthro(1,2-b)oxirene, 4b,5a-dihydro- Benzo(c)phenanthrene 5,6-oxide Benzo(c)phenanthrene-5,6-oxide CCRIS 6809