Synonyms: 4,7-Ethanoisobenzofuran-1,3-dione,3a,4,7,7a-tetrahydro-, (3aa,4a,7a,7aa)-;Bicyclo[2.2.2]oct-5-ene-2,3-dicarboxylic anhydride, cis-endo- (8CI);Bicyclo[2.2.2]octene-2,3-endo-dicarboxylic anhydride;NSC 238003;endo-Bicyclo[2.2.2]oct-5-ene-2,3-dicarboxylic anhydride;endo-Bicyclo[2.2.2]octenedicarboxylic acid anhydride;