1,3-Dipropyl-8-(4-sulfophenyl)xanthine 1,3-Dipropyl-8-p-sulfophenylxanthine 1,3-Dipropyl-8-sulfophenylxanthine 1,3-Dspx 4-(2,3,6,7-Tetrahydro-2,6-dioxo-1,3-dipropyl-1H-purin-8-yl)benzenesulfonic acid 89073-57-4 Benzenesulfonic acid, 4-(2,3,6,7-tetrahydro-2,6-dioxo-1,3-dipropyl-1H-purin-8-yl)- DPSPX PSPX