Synonyms: 4,7-Ethanoisobenzofuran-8-carboxylicacid, 1,3,3a,4,7,7a-hexahydro-1,3-dioxo- (9CI);Bicyclo[2.2.2]oct-7-ene-2,3,5-tricarboxylic acid, cyclic 2,3-anhydride(7CI,8CI); Bicyclo-[2.2.2]-7-octene-2,3,5-tricarboxylic acid-2,3-anhydride;Bicyclo[2.2.2]oct-7-ene-2,3,5-tricarboxylic 2,3-anhydride