Compounds of formula (I): ##STR1## in which: R.sup.1 is hydrogen or acyl; R.sup.2 is hydrogen or C.sub.1 -C.sub.4 alkoxy; and Ar is phenyl or substituted phenyl and pharmaceutically acceptable salts and esters thereof have valuable antibiotic activity, including against Methicillin-resistant strains of Staphylococcus. The invention also provides a process for preparing the compounds and methods and compositions using them.
公式(I)的化合物:##STR1## 其中:R.sup.1是氢或酰基;R.sup.2是氢或C.sub.1 -C.sub.4烷氧基;Ar是苯基或取代苯基,其药用盐和酯具有有价值的抗生素活性,包括对
金黄色葡萄球菌耐
甲氧西林菌株的活性。本发明还提供了制备这些化合物的方法以及利用它们的方法和组合物。