| 摘要 |
The present invention relates to a compound of the formula (1): wherein R1 is group of the formula (2): (wherein X is nitrogen atom or C(R5), Y is nitrogen atom or C(R6), R5 and R6 are each independently hydrogen atom, etc.) etc., m is 1 to 6, L1 is single bond, etc., R2 is hydrogen atom, substituted or unsubstituted alkyl group, etc., R3 is hydrogen atom, etc., L2 is single bond, etc., R4 is hydrogen atom, substituted or unsubstituted aryl group, etc., or pharmaceutically acceptable salt thereof, being useful for preventing or treating Alzheimer's disease.
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