1,2-Ethanediol, butenedioic anhydride, phthalandione, 4-cyclohexene-1,2-dicarboxylic anhydride polymer 1,3-Isobenzofurandione, polymer with 1,2-ethanediol, 2,5-furandioneand 3a,4,7,7a-tetrahydro-1,3-isobenzofurandione 38723-09-0