CAS 4792-29-4 appears in our catalog under these names: 5-Carboxyphthalide, 5-Carboxyphthalide 98%, 1-Oxo-1,3-dihydroisobenzofuran-5-carboxylic acid, 95%, 95%, 1-Oxo-1,3-dihydroisobenzofuran-5-carboxylic acid, 95%. Offered by: Biosynth, Ambeed, Chemat, Fluorochem. Available pack sizes: 0,002kg, 0,001kg, 0,005kg, 0,01kg, 0,025kg, 250mg, 1g, 5g.