| 摘要 |
<p>Compounds of formula (I) and their derivatives: <CHEM> wherein X is hydrogen or a group NHR<1>, wherein R<1> is hydrogen or an amino protecting group, and R is an optionally substituted spiro, fused or bridged bicyclic group optionally containing one or more heteroatoms selected from oxygen, nitrogen and sulphur, are new and useful in the treatment of bacterial infections in humans and animals.</p> |
