2746-19-2 4,7-Methanoisobenzofuran-1,3-dione, 3a,4,7,7a-tetrahydro-, (3a.alpha.,4.beta.,7.beta.,7a.alpha.)- 5-Norbornene-2,3-dicarboxylic anhydride, cis-exo- Exo-cis-5-Norbornene-2,3-dicarboxylic anhydride Himic anhydride NSC110659 exo-3,6-Methylene-1,2,3,6-tetrahydrophthalic anhydride exo-5-Norbornene-2,3-dicarboxylic anhydride