| 摘要 |
The present invention is directed to compounds of formula (I): where R<SUP>1</SUP> , R<SUP>2</SUP>, R<SUP>3</SUP>, R<SUP>4</SUP>, and R<SUP>5</SUP> are as defined herein, and methods of their use for treating certain nervous system disorders and conditions, including, inter alia, vasomotor symptoms (VMS) and chronic pain. |
