A compound of the formula: ##STR1## wherein R.sup.2 is hydrogen or a halogen and R.sup.3 stands for methyl, acetoxymethyl, carbamoyloxymethyl, an alkoxymethyl, an alkylthiomethyl, 2-carboxy-1-ethenyl, or a heterocyclic thiomethyl, or a pharmaceutically acceptable salt thereof, is found to have a broad antimicrobial spectrum and, in particular, effective against Gram-negative bacteria including Escherichia coli, Proteus vulgaris, Pseudomonas aeruginosa, Serratia marcescense as well as Gram-positive ones including antibiotic resistant strains. Thus, these compounds may be used for antimicrobial agents in therapeutical purposes.
公式为:## STR1 ##的化合物,其中R.sup.2是氢或卤素,R.sup.3代表甲基,乙酰氧甲基,
氨甲酰氧甲基,烷氧甲基,烷基
硫甲基,2-羧基-
1-乙烯基或杂环
硫甲基,或其药学上可接受的盐,发现具有广谱抗微
生物谱,特别是对革兰氏阴性菌,包括大肠杆菌,普通变形杆菌,
铜绿假单胞菌,马尔凯西亚沙门氏菌以及革兰氏阳性菌,包括抗生素耐药菌株具有有效作用。因此,这些化合物可用于治疗目的的抗微
生物剂。