A compound of the formula: ##STR1## wherein R.sup.1 is amino or protected amino, R.sup.2 is hydrogen or hydroxy protective group, R.sup.3 is carboxy or protected carboxy, R.sup.4 is hydrogen, lower alkenyl, acyloxy(lower)alkenyl, optionally substituted heterocyclic(lower)alkenyl, optionally substituted heterocyclic(lower)alkenylthio, optionally substituted heterocyclic(lower)alkylthio, or optionally substituted heterocyclic-thio(lower)alkylthio and R5 is halogen or lower alkyl and pharmaceutically acceptable salts thereof, which is useful as a medicament for prophylactic and therapeutic treatment of infectious diseases.
一种化合物的公式:##
STR1## 其中R.sup.1是
氨基或保护
氨基,R.sup.2是
氢或羟基保护基,R.sup.3是羧基或保护羧基,R.sup.4是
氢、低
烯基、酰
氧(低)
烯基、可选择取代的杂环(低)
烯基、可选择取代的杂环(低)
烯基
硫、可选择取代的杂环(低)烷
硫、或可选择取代的杂环
硫(低)烷
硫,R5是卤素或低烷基,以及其药学上可接受的盐,用于预防和治疗传染病的药物。