A compound of formula (I) or a pharmaceutically acceptable salt thereof, wherein R1 to R9 are as defined in the specification and which compound has an Αβ production inhibitory effect and may be useful as a prophylactic or therapeutic agent for a neurodegenerative disease caused by Αβ and typified by Alzheimer-type dementia (AD) or Down's syndrome.
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(2014/02/15)
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