##STR1## wherein R.sup.1, R.sup.2 and R.sup.3 are, inter alia, independently selected from the group consisting of hydrogen, alkyl, aryl, and aralykl. Such compounds as well as their pharmaceutically acceptable salt, ester and amide derivatives are useful as antibiotics. Also disclosed are processes for the preparation of such compounds, pharmaceutical compositions comprising such compounds and methods of treatment comprising administering such compounds and compositions when an antibiotic effect is indicated.
其中,R.sup.1、R.sup.2和R.sup.3等独立地选自氢、烷基、芳基和芳基烷基等组成的群体。这些化合物及其药学上可接受的盐、酯和酰胺衍
生物可用作抗生素。还公开了制备这些化合物的方法、包含这些化合物的药物组合物以及在需要抗生素作用时,通过给予这些化合物和组合物进行治疗的方法。