Disclosed is a substance having an antagonistic effect on the binding of histamine to a histamine H3 receptor or an inhibitory effect on the activity which a histamine H3 receptor constantly exhibits. A compound represented by the formula (I) or a pharmaceutically acceptable salt thereof; (I)
wherein R1 represents a phenyl group which may be substituted or the like and R2 represents a cyano group which may be substituted or the like, or R1 and R2 together form an aliphatic heterocylic ring which may be substituted; R3 represents a group represented by the formula (II-1) below;
and all of X1 to X4 represent a carbon atom or the like: (II-1) where R4 and R5 represent a lower alkyl group or the like; and m1 represents an integer of 2 to 4.
本发明涉及一种物质,其对
组胺与
组胺H3受体的结合具有拮抗作用,或对
组胺H3受体不断表现的活性具有抑制作用。化合物由式(I)或其药学上可接受的盐表示;(I)其中R1代表可能被取代或类似的苯基团,R2代表可能被取代或类似的
氰基团,或R1和R2一起形成可能被取代的脂肪族杂环环;R3代表由下式(II-1)表示的基团;X1到X4都表示碳原子或类似物:(II-1)其中R4和R5代表较低的烷基团或类似物;m1表示2到4的整数。