| 摘要 |
The present invention relates to compounds of formula (I-VII) or a pharmaceutically acceptable salt or prodrug thereof, in which A, L, R<SUB>6</SUB>, R<SUB>7 </SUB>and R<SUB>8 </SUB>are defined herein. The present invention also relates to methods of trating pain using these compounds and pharmaceutical compositions including these compounds.
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