The present invention relates to a compound of formula (I) or a pharmaceutically acceptable salt thereof wherein X and R are as defined herein. The compounds of formula (I) are useful as gyrase and/or topoisomerase IV inhibitors for treating bacterial infections. The compounds of formula (I) either possess a broad range of anti-bacterial activity and advantageous toxicological properties or are prodrugs of compounds having said activity.本發明係關於式(I)化合物:或其醫藥上可接受之鹽,其中X及R係如本文中所定義。該等式(I)化合物可用作用於治療細菌感染之旋轉酶(gyrase)及/或拓撲異構酶IV抑制劑。該等式(I)化合物擁有寬範圍之抗細菌活性及有利毒理學性質或係具有該活性之化合物之前藥。
