1H-v-Triazolo(4,5-d)pyrimidine, 7-amino-5-(methylthio)- 4H-1,2,3-Triazolo(4,5-d)pyrimidin-7-amine, 5-(methylthio)- 7-Amino-5-(methylthio)-1H-v-triazolo(4,5-d)pyrimidine 87866-19-1