PROCESS FOR THE PREPARATION OF CEPHALOSPORINS HAVING ANTIBACTE-RIAL EFFECT AND THEIR APPLICATION FOR THE PREPARATION OF PHARMACEUTICAL COMPOSITIONS HAVING ANTIBACTERIAL EFFECT

摘要

Antibacterially active cephalosporins of the formula IMAGE in which R1 denotes C1-C6-alkyl, phenyl or halogen-substituted phenyl, and R2 and R3, which can be identical or different, denote H, C1-C4-alkyl, chlorine, bromine, carbamoyl or N-C1-C4-alkylcarbamoyl.