A pyridazinone derivative represented by the following general formula ##STR1## wherein R.sub.1 represents a hydrogen atom or a methyl group, either one of R.sub.2, R.sub.3 and R.sub.4 represents a hydrogen atom and the remaining two of them represent a lower alkyl group, a trifluoromethyl group, a halogen atom, a cyano group or a nitro group, and a salt thereof. The compounds are useful as antihypertensive agents.
一种以以下通式表示的
吡啶并
咪唑酮衍
生物:##STR1##其中R.sub.1代表氢原子或甲基基团,R.sub.2、R.sub.3和R.sub.4中的任意一个代表氢原子,其余两个代表较低的烷基基团、三
氟甲基基团、卤原子、
氰基或硝基,以及其盐。该化合物可用作降压药物。