A compound of the formula I ##STR1## in which R.sup.1 represents a hydrogen atom or an alkyl group having from 1 to 4 carbon atoms, the --CONHR.sup.1 group being present at the 3- or 4-position on the phenyl ring, and esters thereof at the 2-carboxyl group and/or at the 8-hydroxy group, have antibacterial and/or .beta.-lactamase inhibiting activity.
公式I的化合物##STR1##中,其中R.sup.1代表氢原子或具有1至4个碳原子的烷基基团,--CONHR.sup.1基团存在于苯环的3-或4-位,其
酯类化合物在2-羧基团和/或8-羟基团处具有抗菌和/或β-内酰胺酶抑制活性。