CAS 80206-91-3 appears in our catalog under these names: 4-(1,3-Dimethyl-2,6-dioxo-2,3,6,9-tetrahydro-1h-purin-8-yl)benzenesulfonic acid, 95%, 8(P-Sulfophenyl)theophylline, 95%, 4-(1,3-Dimethyl-2,6-dioxo-2,3,6,7-tetrahydro-1H-purin-8-yl)benzenesulfonic acid, 97%, 8(-p-Sulfophenyl)theophylline, 8-(p-Sulfophenyl)theophylline. Offered by: Combi-blocks, AmBeed, TRC, Biosynth, MedChemExpress. Available pack sizes: 250mg, 5g, 1g, 25mg, 50mg, 5mg, 25g, 10g.