1,9-Dimethyl-8-azaxanthin 2278-14-0 3,6-Dimethyl-3H-v-triazolo(4,5-d)pyrimidine-5,7(4H,6H)-dione 3H-v-Triazolo(4,5-d)pyrimidine-5,7(4H,6H)-dione, 3,6-dimethyl- BRN 0525591