This invention relates to novel cephem compounds of high antimicrobial activity, said compounds being of the formula: ##STR1## wherein R.sup.1 is a group of the formula: ##STR2## in which R.sup.5 is amino or a protected amino group; and R.sup.6 is lower alkyl, lower alkenyl, lower alkynyl, cycloalkyl, cyclo(lower)alkenyl, aryl, ar(lower)alkyl, or halogen-substituted ar(lower)alkyl; R.sup.2 is carboxy or a protected carboxy group; A is hydroxy(lower)alkylene, amino(lower)alkylene, protected amino(lower)alkylene, lower alkenylene, hydroxyimino(lower)alkylene, lower alkoxyimino(lower)alkylene, or lower alkenyloxyimino(lower)alkylene; and R.sup.3 is carboxy or a protected carboxy group, and pharmaceutically acceptable salts thereof.
本发明涉及一种新型
头孢菌素化合物,具有高抗微
生物活性,所述化合物的
化学式为:##STR1## 其中,R.sup.1是下列式的基团:##STR2## 其中,R.sup.5是
氨基或保护
氨基基团;R.sup.6是较低的烷基、较低的烯基、较低的炔基、环烷基、环烷基烯、芳基、芳基较低烷基、或卤素取代的芳基较低烷基;R.sup.2是羧基或保护羧基基团;A是羟基(较低)烷基、
氨基(较低)烷基、保护
氨基(较低)烷基、较低烯基、羟基
亚胺(较低)烷基、较低烷氧
亚胺(较低)烷基或较低烯氧
亚胺(较低)烷基;R.sup.3是羧基或保护羧基基团,以及其药学上可接受的盐。