| abstract |
Disclosed are: a pharmaceutical composition for inhibiting the accumulation of amyloid-β protein, which comprises a compound represented by the formula (I) or the like or a pharmaceutically acceptable salt thereof; a method for inhibiting the accumulation of amyloid-β protein, which comprises the step of administering an effective amount of a compound represented by the formula (I) or the like or a pharmaceutically acceptable salt thereof to a mammal which is suspected to be diagnosed as having a disease associated with amyloid-β protein; and others. |