129-64-6 3,6-Endomethylene-.DELTA.4-tetrahydrophthalic anhydride 4,7-Methanoisobenzofuran-1,3-dione, 3a,4,7,7a-tetrahydro-, (3a.alpha.,4.alpha.,7.alpha.,7a.alpha.)- 5-Norbornene-2,3-dicarboxylic anhydride, cis-endo- 5-Norbornene-endo-2,3-dicarboxylic anhydride Carbic anhydride Endic anhydride NSC102277 Nadic anhydride endo,cis-5-Norbornene-2,3-dicarboxylic anhydride endo-3,6-Methylene-1,2,3,6-tetrahydrophthalic anhydride endo-5-Norbornene-2,3-dicarboxylic anhydride endo-Himic acid anhydride