Synonyms: 4,7-Ethanoisobenzofuran-1,3-dione,3a,4,7,7a-tetrahydro- (9CI); Bicyclo[2.2.2]oct-5-ene-2,3-dicarboxylic anhydride(6CI,7CI,8CI); 3,6-Endoethylene-4-cyclohexene-1,2-dicarboxylic anhydride;3,6-Endoethylenephthalic anhydride, 1,2,3,6-tetrahydro-;3a,4,7,7a-Tetrahydro-4,7-ethano-2-benzofuran-1,3-dione;Bicyclooctenedicarboxylic anhydride; NSC 4556