| 摘要 |
The present invention provide a medicament for treating the diseases induced by production, secretion or deposition of amyloid-βproteins, for example, a compound of the following formula (I) wherein R1, R2a, R2b, R3a, R3b, R4a, R4b, ring A, Y and the dotted line are defined in the specification, its pharmaceutically acceptable salt or a solvate thereof.
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