NOVEL CEPHALOSPORIN DERIVATIVES

摘要

The present invention relates to cephalosporin derivatives having formula : and their crystalline form, processes for the preparation thereof, pharmaceutical compositions comprising such derivatives, compounds for use as intermediates in the synthesis of such derivatives and processes for producing thereof, and the use of such derivatives for the manufacture of a medicament having valuable therapeutic and preventative properties. The compounds of the present invention containing these substituents have a wide antibacterial spectrum against Gram-negative bacteria including Pseudomonas aeruginosa and Gram-positive bacteria including methicillin-resistant Staphylococcus aureus. These compounds are extremely useful for the treatment of infectious diseases.