4H-1,2,3-Triazolo(4,5-d)pyrimidin-7-amine, 4-methyl- 4H-v-Triazolo(4,5-d)pyrimidine, 7-amino-4-methyl- 7-Amino-4-methyl-4H-v-triazolo(4,5-d)pyrimidine 77022-74-3