3-((Benzyloxy)methyl)-4,6-dimethoxy-1H-pyrazolo[3,4-d]pyrimidine3-((Benzyloxy)methyl)-4,6-dimethoxy-1H-pyrazolo[3,4-d]pyrimidine3-((Benzyloxy)methyl)-4,6-dimethoxy-1H-pyrazolo[3,4-d]pyrimidine