New compound of the formula:
wherein A' is a group of the formula:
in which R3 is hydrogen or alkyl,
R4 is hydrogen, halogen, alkyl, alkoxy, acyloxymethyl, or substituted or unsubstituted heterocyclic-thiomethyl,
R5 is carboxy or protected carboxy, and
X is -S- or -0-,
provided that when A' is a group of the formula: R5 then R4 is hydrogen, halogen, alkoxy or carbamoyloxy- methyl protected by an amino-protecting group, and R3 and R5 are each as defined above, or a salt thereof or a hydrate thereof and processes for their preparation.
式的新化合物:
其中 A' 是式中的基团:
其中 R3 为氢或烷基、
R4 是氢、卤素、烷基、烷氧基、酰氧基甲基或取代或未取代的杂环-
硫甲基、
R5 是羧基或受保护的羧基,以及
X 是-S-或-0-、
条件是当 A' 是式中的基团时:R5,则 R4 为氢、卤素、烷氧基或被
氨基保护基团保护的
氨基甲酰氧基-甲基,R3 和 R5 各自如上定义,或其盐或其
水合物及其制备工艺。