TRIAZOLOPURINE DERIVATIVES, MEDICINAL COMPOSITION CONTAINING THE DERIVATIVES, ADENOSINE A3 RECEPTOR COMPATIBILIZING AGENT, AND ASTHMATIC REMEDY

摘要

Triazolopurine derivatives represented by general formula (1), wherein R<1> and R<2> each is as defined in the description; and A represents a group represented by (a), (b), or (c) (wherein R<3> is as defined in the description). These compounds have an affinity for an adenosine A3 receptor. A medicinal composition containing any of these is hence used as an adenosine A3 receptor compatibilizing agent or an asthmatic remedy.