An agent for preventing and/or treating Parkinson's disease or Parkinson's syndrome, comprising, as an active ingredient, an astrocyte function-improving agent is disclosed. The astrocyte function-improving agent is preferably a compound represented by formula (I), a non-toxic salt thereof, or a hydrate thereof: R.sup.5, R.sup.6, R.sup.11 and n are defined in the specification.

 
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