A 3,7-disubstituted-3-cephem-4-carboxylic acid of the general formula: ##STR1## having antibacterial activity, processes for preparing same, and pharmaceutical compositions thereof for treating infectious diseases in humans and animals.
                            一种具有抗菌活性的3,7-二取代-3-头孢烷-4-
羧酸,通式如下:##STR1## 以及制备该化合物的方法和用于治疗人和动物的传染病的制药组合物。