| 摘要 |
This invention provides the compounds of formula (I): or a pharmaceutically acceptable ester or salt thereof, wherein R1 and R2 independently represent hydrogen or the like; R3 represents aryl or the like;-X-Y-represents-CH2O-or the like; and n represents 0, 1 or 2. These compounds have ORL1-receptor antagonist activity; and therefore, are useful to treat diseases or conditions such as pain, various CNS diseases etc.
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