| abstract |
This invention provides the compounds of formula (I): or a pharmaceutically acceptable ester of such a compound, or a pharmaceutically acceptable salt thereof, wherein R1 and R2 independently represent a hydrogen atom or the like; R3 represents an aryl group having 6 to 10 atoms in the ring or the like; X represents an oxygen atom or the like; Y represents an oxygen atom or similar; and n represents an integer 0, 1 or 2. These compounds have antagonistic activity of the ORL1 receptor; and, therefore, they are useful for treating diseases or conditions such as pain, various CNS diseases etc. |