申请人:HOFFMANN LA ROCHE
                            
                            
                                公开号:WO2009068467A1
                            
                            
                                公开(公告)日:2009-06-04
                            
                            Compounds of formula (I) as well as pharmaceutically acceptable salts and esters thereof, wherein R1 to R3 have the significance given in claim 1 and which can be used in the form of pharmaceutical compositions.