Synonyms: 3a,4,7,7a-Tetrahydro-4,7-methanoisobenzofuran-1,3-dione; 5-Norbornene-2,3-dicarboxylic anhydride; Bicyclo2.2.1-5-heptene-2,3-dicarboxylic Anhydride; Bicyclo[2.2.1]hept-5-ene-2,3-dicarboxylic anhydride; Carbic anhydride; Nadic anhydride; 1,2,3,6-tetrahydro-3,6-methanophthalic anhydride; 3,6-Endomethylene-1,2,3,6-tetrahydrophthalic anhydride