Novel 1,4-thiazine derivatives represented by general formula (I) wherein R1 and R2 each represents a hydrogen atom, a lower alkyl group, a lower alkoxy group, an amino group, a lower alkylamino group, an arylamino group, a hydroxy group, an aryl group, a 5- or 6-membered heterocyclic ring residue, R3 and R4 each represents a hydrogen atom or a lower alkyl group, R5 represents a nitrogen-containing ring residue (provided that, when R, and R2 represent a hydrogen atom and R3 and R4 each represents a hydrogen atom or a lower alkyl group, R5 does not represent a pyridinyl group) and pharmacologically acceptable acid addition salts thereof, process for their preparation, and cardiotonics containing them as effective ingredients.
通式(I)代表的新型1,4-
噻嗪衍
生物 其中R1和R2各自代表氢原子、低级烷基、低级烷氧基、
氨基、低级烷基
氨基、芳基
氨基、羟基、芳基、5或6元杂环残基,R3和R4各自代表氢原子或低级烷基、R5 代表含氮环残基(条件是,当 R 和 R2 代表氢原子,R3 和 R4 各自代表氢原子或低级烷基时,R5 不代表
吡啶基)及其药理学上可接受的酸加成盐、其制备工艺和含有它们作为有效成分的强心剂。