| 摘要 |
The present invention is directed to a method for treating, ameliorating or preventing CB2 receptor mediated pain in a subject in need thereof compri sing administering to the subject an effective amount of a compound of formu la (I): or a form thereof, wherein X1R1, X2R2, X3R3, X4R4 and X5R5 are as de fined herein.
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