A compound of the formula: ##STR1## wherein R.sub.1 stands for n-propyl or isopropyl; and R.sub.2 stands for n-butyl, isobutyl, n-pentyl, n-hexyl or 2-ethylbutyl, or a pharmaceutically acceptable salt thereof, processes for preparing the same and a pharmaceutical composition thereof are provided. The compound can orally be applied as antibiotics having improved bioavailability.
提供一种公式为 ##STR1## 的化合物,其中R.sub.1代表正丙基或异丙基;R.sub.2代表正丁基、异丁基、正戊基、正己基或2-乙基丁基,或其药学上可接受的盐,以及制备该化合物的方法和其制剂。该化合物可作为口服抗生素,具有改善的
生物利用度。