5-Isobenzofurancarboxylic acid, 1,3-dihydro-1-oxo-
5-Phthalancarboxylic acid, 1-oxo-
1,3-Dihydro-1-oxo-5-isobenzofurancarboxylic acid
1,4-Benzenedicarboxylic acid, (hydroxymethyl)-, γ-lactone
Phthalide-5-carboxylic acid
5-Carboxyphthalide
1-Oxo-1,3-dihydroisobenzofuran-5-carboxylic acid