Synonyms: 4,7-Methanoisobenzofuran-1,3-dione,3a,4,7,7a-tetrahydro-, (3aa,4a,7a,7aa)-;5-Norbornene-2,3-dicarboxylic anhydride, cis-endo- (8CI);5-Norbornene-endo-2,3-dicarboxylic anhydride;Bicyclo[2.2.1]-2-heptene-endo-5,6-dicarboxylic acid anhydride;Bicyclo[2.2.1]hept-5-ene-2,3-dicarboxylic acid endo-cis-anhydride;Bicyclo[2.2.1]hept-5-ene-endo,endo-2,3-dicarboxylic anhydride;Bicyclo[2.2.1hept-5-ene-2-endo,3-endo-dicarboxylic anhydride;