39573-55-2 5-17-01-00351 (Beilstein Handbook Reference) 7-Oxabicyclo(4.1.0)hept-3-ene, 2,5-dibromo-, cis- BRN 4230787 cis-2,5-Dibromo-7-oxabicyclo(4.1.0)hept-3-ene cis-Cyclohexa-1,4-diene oxide dibromide