A novel 1,4-thiazine derivative represented by the formula I, a pharmaceutically acceptable acid addition salt thereof, a process for preparation thereof and a cardiotonic agent comprising it as an effective component; ##STR1## wherein R.sub.1 and R.sub.2 represent respectively hydrogen atom, lower alkyl group, lower alkoxy group, amino group, lower alkyl-amino group, aryl-amino group, hydroxy group, aryl group or 5- or 6-membered heterocyclic residue; R.sub.3 and R.sub.4 represent hydrogen atom or lower alkyl group; and R.sub.5 represents N-containing heterocyclic residue and is not pyridinyl group when R.sub.1 and R.sub.2 represent hydrogen atom and R.sub.3 and R.sub.4 represent hydrogen atom or lower alkyl group.
一种由式I代表的新型1,4-
噻嗪衍
生物,其药学上可接受的酸盐,其制备方法以及作为有效成分的强心药剂;其中R.sub.1和R.sub.2分别代表氢原子,较低的烷基基团,较低的烷氧基团,
氨基,较低的烷基
氨基团,芳基
氨基团,羟基,芳基或5-或6-成员杂环残基;R.sub.3和R.sub.4代表氢原子或较低的烷基基团;R.sub.5代表含氮杂环残基,当R.sub.1和R.sub.2代表氢原子且R.sub.3和R.sub.4代表氢原子或较低的烷基基团时,R.sub.5不代表
吡啶基。