The present invention provides a compound having a superior acid secretion inhibitory effect and showing an antiulcer activity and the like. The present invention provides a compound represented by the formula (I) wherein R
1
is a nitrogen-containing monocyclic heterocyclic group optionally condensed with a benzene ring or a heterocycle, the nitrogen-containing monocyclic heterocyclic group optionally condensed with a benzene ring or a heterocycle optionally has substituent(s), R
2
is an optionally substituted C
6-14
aryl group, an optionally substituted thienyl group or an optionally substituted pyridyl group, R
3
and R
4
are each a hydrogen atom, or one of R
3
and R
4
is a hydrogen atom and the other is an optionally substituted lower alkyl group, an acyl group, a halogen atom, a cyano group or a nitro group, and R
5
is an alkyl group or a salt thereof.
本发明提供了一种具有优越的酸分泌抑制作用和抗溃疡活性等的化合物。本发明提供了一种由式(I)表示的化合物,其中R1是一种
氮含杂环单环芳基,可选地与
苯环或杂环缩合,所述
氮含杂环单环芳基可选地具有取代基,R2是一种可选地取代的C6-14芳基、可选地取代的
噻吩基或可选地取代的
吡啶基,R3和R4各自是
氢原子,或者R3和R4中的一个是
氢原子,另一个是可选的取代较低烷基、酰基、卤素原子、
氰基或硝基,R5是一种烷基或其盐。