| 摘要 |
The present invention provides compounds of the general formula wherein R<4 >is one of the following groups and R<1>, R<2>, R<3>, R<7>, R<8>, and R<9 >are as defined in the specification and pharmaceutically acceptable salts, optically pure enantiomers, racemates or diastereomeric mixtures thereof. The compounds are useful for the treatment of Alzheimer's disease.
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