Naphthyridine compounds having the formula: ##STR1## wherein Z is an amine or an aliphatic heterocyclic group, R is a phenyl group or an aromatic heterocyclic group and R.sub.1 is hydrogen or a carboxy protecting group. The compounds of the invention have antibacterial activity.
                            具有下列公式的
萘啶化合物:##STR1## 其中Z是胺基或脂肪族杂环基,R是苯基或芳香族杂环基,R.sub.1是氢或羧基保护基。本发明的化合物具有抗菌活性。