申请人:Hoffmann-La Roche Inc.
                            
                            
                                公开号:US07507736B2
                            
                            
                                公开(公告)日:2009-03-24
                            
                            
The present invention relates to compounds of formula I
wherein A and R1 to R4 are as defined in the description and claims, and pharmaceutically acceptable salts thereof. The compounds are useful for the treatment and/or prevention of diseases which are associated with the modulation of H3 receptors.
                            本发明涉及公式I的化合物,其中A和R1到R4如描述和权利要求所定义,并且其药学上可接受的盐。这些化合物对于治疗和/或预防与H3受体调节相关的疾病是有用的。