The invention relates to novel cephem compounds, of high antimicrobial activity, of the formula ##STR1## wherein R.sup.1 is amino or protected amino, R.sup.2 is lower alkyl substituted with 1 to 3 halogen atoms, R.sup.3 is thiadiazolylthiomethyl which may be substituted with lower alkyl, or tetrazolylthiomethyl which may be substituted with lower alkyl or lower alkenyl, and R.sup.4 is carboxy or protected carboxy, and a pharmaceutically acceptable salt thereof.
本发明涉及一种新型
头孢菌素化合物,具有高度的抗微
生物活性,其
化学式为:##STR1## 其中R.sup.1是
氨基或保护
氨基,R.sup.2是1至3个卤素原子取代的低碳基,R.sup.3是
硫代
噻二唑甲基,可以用低碳基取代,或者是硝基
咪唑甲基,可以用低碳基或低烯基取代,R.sup.4是羧基或保护羧基,以及其药学上可接受的盐。