Carboxylic acid derivative of the formula
in which
R1 is amino-substituted-heterocyclic group which may have halogen, protected amino-substituted-heterocyclic group which may have halogen, or a group of the formula:
wherein R3 is lower alkyl,
A13 is lower alkylene having a group of the formula: = N-ORh4
Re is carboxy or a protected carboxy group, or a salt thereof and process for the preparation thereof.
式中R1为可带有卤素的
氨基取代的杂环基、可带有卤素的受保护的
氨基取代的杂环基、或式中R3为低级烷基、A13为具有式中基团的低级亚烷基:=N-ORh4 Re为羧基或受保护的羧基的
羧酸衍
生物或其盐及其制备方法。