Pyridobenzoxazine derivatives of formula (I) ##STR1## wherein: X.sub.1 represents a hydrogen atom or a halogen atom, R.sub.1 represents a cyclic amino group which may contain additional hetero atom(s) of N,S and O and may be substituted with one or more substituents selected from the group consisting of hydroxyl, amino, alkyl, mono- or di-alkylamino, hydroxyalkyl and aminoalkyl, and physiologically acceptable salts thereof, having antibacterial activity.
化合物式(I)的
吡啶并苯并噁嗪衍
生物:##STR1## 其中:X.sub.1代表氢原子或卤素原子,R.sub.1代表一个环状
氨基团,该团可能包含额外的N、S和O杂原子,并且可能被一个或多个取代基所取代,所述取代基选择自羟基,
氨基,烷基,单或双烷基
氨基,羟基烷基和
氨基烷基的群,以及其生理上可接受的盐,具有抗菌活性。