CAS 56437-16-2 appears in our catalog under these names: 3–Carboxy–6–hydroxycoumarin, 6-Hydroxy-2-oxo-2H-chromene-3-carboxylic acid, 95%, 95%, 3-Carboxy-6-hydroxycoumarin, 99.95%, 3-Carboxy-6-hydroxycoumarin, 95%. Offered by: GLPBio, Chemat, MedChemExpress, Fluorochem. Available pack sizes: 100mg, 25mg, 50mg, 250mg, 1g, 50 mg, 100 mg, 25 mg.