abstract |
PURPOSE: 3-Aminopyrazolo [3,4-d] pyrimidine derivatives of formula I (R 1 - R 3 are H or alkyl; R 3 is H, alkyl, aryl, aralkyl or acyl; R 5 is H, acyl, alkylcarbamoyl or alkylthiocarbamoyl) and their salts, e.g. 3-methylamino-5,7-diethylpyrazolo [3,4-d] pyrimidine. n COPYRIGHT: (C)1978,JPO&Japio |