This invention relates to a compound of the formula: ##STR1## wherein Q is nitrogen or CH; R.sup.1 is hydrogen or a lower alkyl group which may be substituted; and ring A is a pyridine or pyridazine ring which is substituted at the ring-constituting carbon atom by a group of the formula: --E--(CH.sub.2).sub.n --R.sup.2 in which E is sulfur or NH; R.sup.2 is an amino, carbamoylamino, formylamino, acetylamino, N-formimidoylamino, N-acetimidoylamino, lower alkylamino, hydroxyl or carbamoyloxy group; and n is an integer of 2 to 4, or a pharmaceutically acceptable salt thereof. The compound (I) or a pharmaceutically acceptable sale thereof has excellent antibacterial activity and is used as antibiotics.
本发明涉及一种化合物,其
化学式为:##STR1## 其中Q为氮或CH; R.sup.1为氢或可被取代的低烷基;环A为取代在构成环的碳原子上的公各式为:--E--(CH.sub.2).sub.n --R.sup.2的基团的
吡啶或
吡嗪环,其中E为
硫或NH; R.sup.2为
氨基,
氨基甲酰基,甲酰
氨基,乙酰
氨基,N-甲
酰亚胺氨基,N-乙
酰亚胺氨基,低烷基
氨基,羟基或羰
氨基氧基;n为2至4的整数,或其药学上可接受的盐。该化合物(I)或其药学上可接受的盐具有优异的抗菌活性,并用作抗生素。