(1,2,5)Thiadiazolo(3,4-d)pyrimidine-5,7(4H,6H)-dione, 4,6-dimethyl- 1,3-Dimethyl-8-thiaxanthin 4,6-Dimethyl(1,2,5)thiadiazolo(3,4-d)pyrimidine-5,7(4H,6H)-dion 4,6-Dimethyl-(1,2,5)thiadiazolo(3,4-d)pyrimidine-5,7(4H,6H)-dione 4-27-00-09610 (Beilstein Handbook Reference) 4712-49-6 8-Thiatheophylline BRN 0209794 NSC 400016 Thiatheophylline