摘要 |
Disclosed are compounds of the formula (I) wherein A, R<SUB>1</SUB>, R<SUB>2</SUB>, R<SUB>3</SUB>, R<SUB>4 </SUB>and X<SUB>1 </SUB>are as disclosed herein. The compounds have affinity for the ORL1 receptor and are useful in the treatment of chronic and acute pain.
|