New cephalosporin compounds of the formula: ##STR1## wherein R.sub.1 is hydrogen or hydroxy, R.sub.2 is a substituted alkanoyl group, R.sub.3 is hydrogen, carbamoyloxy, alkanoyloxy or a heterocyclic-thio group which may have suitable substituents, and R.sub.4 is carboxy or protected carboxy.
化合物的名称为新
头孢菌素化合物,
化学式如下: ##STR1## 其中R.sub.1为氢或羟基,R.sub.2为取代的烷酰基,R.sub.3为氢、
氨基甲酰氧基、烷酰氧基或具有适当取代基的杂环
硫基团,R.sub.4为羧基或保护羧基。