| 摘要 |
The present invention relates to compounds having the formula, wherein, Q is optionally substituted aryl or heteroaryl, R<SUB>1 </SUB>is hydrogen or C<SUB>1-4</SUB>alkyl, and R<SUB>2</SUB>, R<SUB>3</SUB>, R<SUB>4 </SUB>and R<SUB>5 </SUB>are hydrogen or optional substituents as defined in the specification.
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