Disclosed are compounds of the general formula: ##STR1## wherein R.sub.1 is amino, an acylated amino or a protected amino group, X is hydrogen or methoxy, and R' is hydrogen, R or R.sup.4 wherein R is an organic residue attached to the azetidine ring through a carbon atom therein and R.sub.4 is azido, a halogen, an amino group which may optionally be acylated or a group of the formula ##STR2## wherein R.sub.5 is an organic residue and n is 0, 1 or 2, and pharmeceutically acceptable salts and esters thereof. The compounds have antimicrobial and/or .beta.-lactamase-inhibitory activity and are of value as drugs for human beings and domesticated animals.
本发明涉及一般式为:##STR1##的化合物,其中R.sub.1是
氨基,酰化
氨基或保护
氨基基团,X是氢或甲氧基,R'是氢,R或R.sup.4,其中R是通过其中的一个碳原子连接到氮杂四元环上的有机残基,R.sub.4是偶氮基,卤素,
氨基(可以选择性地酰化)或式子##STR2##中的基团,其中R.sub.5是有机残基,n为0、1或2,以及其药学上可接受的盐和酯。这些化合物具有抗微
生物和/或β-内酰胺酶抑制活性,是人类和家畜的有价值的药物。