15,16-Dihydro-1,11-methanocyclopenta(a)phenanthren-17-one 2,3-Dihydrodicyclopenta(c,lmn)phenanthren-1(9H)-one 72041-34-0 CCRIS 2474 Dicyclopenta(a,def)phenanthren-6(4H)-one, 7,8-dihydro (9CI)