for the following products
cis-5-Norbornene-exo-2,3-dicarboxylic anhydride | Exo-3,6-methylene-1,2,3,6-tetrahydrophthalic anhydride | Exo-na(cis-5-norbornene-exo-2,3-dicarboxylic anhydride) and (3aR,4R,7S,7aS)-3a,4,7,7a-Tetrahydro-4,7-methanoisobenzofurn-1,3-dione
