4,7-Epoxyisobenzofuran-1,3-dione, 5,6-dibromohexahydro- (9CI) 51371-59-6 7-Oxabicyclo(2.2.1)heptane-2,3-dicarboxylic anhydride, 5,6-dibromo-, (E)- NSC 23791 Phthalic anhydride, hexahydro-4,5-dibromo-3,6-endoxo-, (E)- trans-4,5-Dibromo-3,6-endoxohexahydrophthalic anhydride