| 摘要 |
<p>The present invention relates to compounds of formula (I), or pharmaceutically acceptable salts, prodrugs, salts of prodrugs, or combinations thereof, wherein R<sub>1</sub>, R<sub>2</sub>, R<sub>3</sub>, R<sub>4</sub>, and L<sub>2</sub>, are defined in the specification, compositions comprising such compounds, and methods of treating conditions and disorders using such compounds and compositions.</p> |
