abstract |
The present invention provides a compound of Formula I: n n n n n n n n n n n n wherein R 1 is hydrogen or methyl; and n R 2 is: n n n n n n n n n n n n n n n n or a pharmaceutically acceptable salt thereof, useful for treating pain, including chronic pain, chronic lower back pain, diabetic peripheral neuropathic pain, and osteoarthritis pain. |