Novel benzoxazine or benzothiazine derivatives of the formaula(A),
wherein R₁, R₂ and R₃ are the same or different and represent hydrogen atom or C₁₋₄ lower alkyl group and X and Y are the same or different and represent oxygen or sulfur atom;
have an excellent inotropic effect and can be used as cardiac stimulant.
新型苯并噁嗪或苯并
噻嗪衍
生物的
化学式(A),其中R₁、R₂和R₃相同或不同,代表氢原子或C₁₋₄低碳基团,X和Y相同或不同,代表氧或
硫原子;具有出色的正性肌力作用,可用作心脏兴奋剂。