The present invention relates to compounds of formula I and their pharmaceutically acceptable salts wherein in formula I is:
wherein R1 to R4 are as defined in the description and claims. The compounds of the present invention are useful for the treatment and/or prevention of diseases which are associated with the modulation of histamine 3 (H3) receptors.
本发明涉及公式I的化合物及其药学上可接受的盐,其中在公式I中:其中R1至R4如说明书和权利要求书所定义。本发明的化合物可用于治疗和/或预防与
组胺3(H3)受体调节有关的疾病。