摘要:
The present invention relates to a medicament for treating or preventing central nervous system disease whose cause is related to abnormal aggregation of proteins in the brain, which comprises as an active ingredient a compound of formula (1) or a pharmaceutically acceptable salt thereof, wherein R
1
and R
2
are hydrogen, etc., R
3
and R
4
are hydrogen, C
1-6
alkyl, etc., R
5
is halogen, C
1-6
alkyl, etc., R
6
is hydrogen, halogen, etc., X is oxygen, etc., Y is carbon, etc., m and n are an integer of 0, 1, etc., r and s are 0, 1, 2, etc., Hy is pyridine ring, etc., which has an action of suppressing or reducing the accumulation of abnormal aggregation of proteins in the brain.