| 摘要 |
<p>The compounds of the formula (II): (II) or pharmaceutically acceptable salts or esters thereof wherein A is a hydrogen atom or an esterifying radical; X is an alkyl group of 1-12 carbon atoms optionally substituted by a hydroxy, amino, acylamino of Cl 6 alkoxy group, which substituents are not on the carbon atom adjacent to the nitrogen atom; or a C5-7 cycloalkyl group; or a phenylalkyl group wherein the carbon atom content of the alkyl part is 1-6 and the phenyl part is optionally substituted with a fluorine, bromine, chlorine, C1-6 alkyl, or C1-6 alkoxy; with the proviso that when X represents an optionally substituted phenylalkyl group and A represents C1-3 alkyl, then tha -CO2A group is attached to the alkyl part of the phenylalkyl group; have been found to be .beta.-lactamase inhibitors and antibacterial agents. Their preparation and use is described.</p> |
