| 摘要 |
<p>The present invention provides a compound of the Formula II: Formula II wherein X is: R1 is H, -CN, or F; R2 is H or methyl; R3 is H; and R4 is H, methyl, or ethyl; or R3 and R4 joined together form a cyclopropyl ring; or a pharmaceutically acceptable salt thereof.</p> |
