The present invention relates to compounds of formula I and their pharmaceutically acceptable salts wherein in formula I is:
wherein R
1
to R
4
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的化合物及其药用盐,其中在公式I中为:其中R1至R4如描述和索赔中所定义。本发明的化合物对于与
组织胺3(H3)受体调节相关的疾病的治疗和/或预防是有用的。