申请人:HOFFMANN LA ROCHE
公开号:WO2004046152A1
公开(公告)日:2004-06-03
The present invention provides a compound of the formula: (I) ;or a pharmaceutically acceptable salt thereof, wherein R1, R2, R3, X1, X2, and Ar1 are as defined herein. The present invention also provides a process for producing the same, compositions comprising the same, and methods for using the same.