Cephalosporin compounds

摘要

The present invention relates to novel cephalosporin compounds having high antimicrobial activity, which are shown by the formula(I), and to a process for preparing them <IMAGE> (I) wherein R1 is a hydrogen atom or an amino protecting group; R2 is acetoxy; and R3 is a hydrogen atom or a carboxyl protecting group (wherein when R2 contains quaternary ammonium, r2 and R3 may form a zwitter ion). The present invention also relates to the non-toxic and pharmaceutically acceptable salts of the cephalosporin compounds of the formula (I). Also described are compositions containing the antibiotics according to the present invention.