A pyrazolopyrazine compound of the following formula (I). ##STR1##

wherein

  • R1 is hydrogen or a suitable substituent; and
  • R2 is hydrogen or halogen,
  • or a salt thereof.
    • The pyrazolopyrazine compound (I) and salt thereof of the present invention are adenosine antagonists and are useful for the prevention and/or treatment of depression, dementia (e.g. Alzheimer's disease, cerebrovascular dementia, dementia accompanying Parkinson's disease, etc.), Parkinson's disease, anxiety, pain, cerebrovascular disease (e.g. stroke, etc.), heart failure and the like.

     
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