| abstract |
Cephalosporin derivatives exhibiting excellent antibacterial activity, particularly against bacteria of the Pseudomonas or Serratia on ferrous species, and represented by the formula I wherein R i, R 2, R 3, R 4, R 5 and n are as defined in the specification, and salts from that? A process for producing the same and an antibacterial preparation containing the same as an active ingredient are disclosed |