CAS 272437-84-0 appears in our catalog under these names: 3,4-Dihydro-3-oxo-2h-benzo[b][1,4]thiazine-6-carboxylic acid, 98%, 3-Oxo-3,4-dihydro-2H-1,4-benzothiazine-6-carboxylic acid 95%, 3-Oxo-3,4-dihydro-2H-1,4-benzothiazine-6-carboxylic acid, 95%, 95%, 3-Oxo-3,4-dihydro-2H-benzo[1,4]thiazine-6-carboxylic acid, 95%. Offered by: Combi-blocks, Ambeed, Chemat, Fluorochem. Available pack sizes: 1g, 10g, 25g, 5g, 100mg, 250mg.