Synonyms: 5-Isobenzofuran carboxylic acid, 1,3-dihydro-1,3-dioxo-, polymer with hexahydro-2H-azepin-2-one and 1,1'-methylenebis[4-isocyanatobenzene];5-Isobenzofuran carboxylic acid,1,3-dihydro-1,3-dioxo-,polymer with hexahydro-2H-azepin-2-one and 1,1'-methylenebis[4-isocyanatobenzene]