153901-75-8 2-(2,2-Diethoxyethyl)-6-(methylthio)-2H-pyrazolo(3,4-d)pyrimidin-4-amine 2H-Pyrazolo(3,4-d)pyrimidin-4-amine, 2-(2,2-diethoxyethyl)-6-(methylthio)- 4-Amino-2-(2',2'-diethoxyethyl)-6-methylthio-2H-pyrazolo(3,4-d)pyrimidine