1,3,9-Trimethyl-8-azaxanthin 2278-16-2 3,4,6-Trimethyl-3H-v-triazolo(4,5-d)pyrimidine-5,7(4H,6H)-dione 3H-v-Triazolo(4,5-d)pyrimidine-5,7(4H,6H)-dione, 3,4,6-trimethyl- BRN 0529288