New cephem compound of the formula :
wherein
R' is amino or acylamino,
R2 is hydrogen, aryl which may have suitable substituent(s), a heterocyclic group which may have suitable substituent(s) or cyano, and
R3 is carboxy or protected carboxy, and pharmaceutically acceptable salt thereof, processes for its preparation and pharmaceutical compositions comprising them in association with a pharmaceutically acceptable, substantially non-toxic carrier or excipient. The invention also relates to intermediate compounds of the formula
and their preparation and intermediate compounds of the formula
式中R'为
氨基或酰
氨基,R2为氢、可具有适当取代基的芳基、可具有适当取代基的杂环基团或
氰基,R3为羧基或受保护羧基的新头孢化合物及其药学上可接受的盐、其制备工艺以及由它们与药学上可接受的、基本上无毒的载体或赋形剂组成的药物组合物。 本发明还涉及式的中间体化合物及其制备方法和式的中间体化合物