| 摘要 |
The invention relates to a compound of the formula (I) wherein R<SUP>1</SUP>, R<SUP>2</SUP>, R<SUP>3</SUP>, R<SUP>4</SUP>, R<SUP>5</SUP>, R<SUP>6</SUP>, R<SUP>7</SUP>, R<SUP>8 </SUP>and R<SUP>9 </SUP>are defined as in the specification and claims and to its use for treating or preventing Alzheimer's disease and other similar diseases.
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