2,2',5,5'-Tetrachlorobiphenyl 3,4-oxide 2,5,2',5'-Tetrachlorobiphenyl 3,4-oxide 2,5-Dichloro-3-(2,5-dichlorophenyl)-7-oxabicyclo(4.1.0)hepta-2,4-diene 5-17-02-00201 (Beilstein Handbook Reference) 68099-35-4 7-Oxabicyclo(4.1.0)hepta-2,4-diene, 2,5-dichloro-3-(2,5-dichlorophenyl)- BRN 1387915 CCRIS 6156