DERIVATIVES OF SYN-ISOMER OF CEPHALOSPORIN, THEIR OPTICALLY ACTIVE ANTIPODES OR RACEMIC MIXTURE AND THEIR PHARMACEUTICALLY ACCEPTABLE ACID-ADDITIVE SALTS

摘要

The invention relates to the products of formula: in which: R1 =, in particular, or Rb and Rc = H or acyl A and A' =, in particular H, alkali metal equivalent, aminated organic base, readily cleavable ester group, or CO2A represents CO2<(-)> to a process for their preparation, to their use as medicaments, to compositions containing them and to the new intermediates obtained.