CAS 74171-22-5 appears in our catalog under these names: 2,4-Dioxo-2,4-dihydro-1h-3,1-benzoxazine-6-sulfonyl chloride, 95%, 2,4-Dioxo-2,4-dihydro-1H-3,1-benzoxazine-6-sulfonyl chloride, 97%. Offered by: Combi-blocks, AmBeed. Available pack sizes: 1g, 250mg, 100mg, 5g.