CAS 20197-92-6 appears in our catalog under these names: 4,5-Dimethoxyisatoic anhydride 97%, 6，7-Dimethoxy-1H-benzo[d][1，3]oxazine-2，4-dione, 97%, 97%, 4,5-Dimethoxy-isatoic anhydride, 95%. Offered by: Ambeed, Chemat, Fluorochem. Available pack sizes: 250mg, 1g, 5g, 10g, 25g, 100g, 2.5g.