3,7-disubstituted-3-cephem-4-carboxylic acid compounds having bacteriostatic properties and the following formula: ##STR1## in which R.sup.1 is thiadiazolyl or isothiazolyl, each of which may have suitable substituent(s), or thiazolyl; R.sup.2 is hydrogen or lower alkyl; R.sup.3 is carboxy or protected carboxy; R.sup.4 is hydrogen, acyloxy or a heterocyclicthio group which may have suitable substituent(s); and R.sup.5 is hydrogen or lower alkoxy, process for making same and treating infectious diseases therewith.
具有细菌抑制性质的3,7-二取代-3-
头孢菌素-4-
羧酸化合物,其
化学式如下:##STR1##其中,R.sup.1是
噻二唑基或
异噻唑基,每个基团可能具有适当的取代基,或是
噻唑基;R.sup.2是氢或低碳基;R.sup.3是羧基或保护羧基;R.sup.4是氢、酰氧基或杂环
硫基团,其可能具有适当的取代基;R.sup.5是氢或低碳氧基。制备方法及用于治疗传染病的方法。