3a,4a-Dihydrobenz(8,9)acephenanthryleno(4,5-b)oxirene 93673-34-8 Benz(8,9)acephenanthryleno(4,5-b)oxirene, 3a,4a-dihydro- Benz(k)acephenanthrylene-4,5-oxide CCRIS 1697