Compounds of the formula ##STR1## wherein R.sub.1 and R.sub.4 represent certain heterocyclic groups; R.sub.2 is hydrogen or lower alkyl; and R.sub.3 is hydrogen, lower alkyl, phenyl-lower alkyl, substituted phenyl-lower alkyl, diphenyl-lower alkyl, tri(lower alkyl)stannyl, tri(lower alkyl)silyl, a salt forming ion, or the group ##STR2## wherein R is lower alkyl, phenyl, phenyl-lower alkyl, or substituted phenyl and phenyl-lower alkyl are disclosed. These compounds are useful as antibacterial agents.
化合物的公式为##STR1##其中R.sub.1和R.sub.4代表某些杂环基团;R.sub.2是氢或较低的烷基;而R.sub.3是氢、较低的烷基、苯基-较低的烷基、取代苯基-较低的烷基、二苯基-较低的烷基、三(较低的烷基)
锡基、三(较低的烷基)
硅基、盐形成离子,或者是##STR2##其中R是较低的烷基、苯基、苯基-较低的烷基或取代苯基,而苯基-较低的烷基。这些化合物可用作抗菌剂。