The invention relates particularly to syn compounds of the formula: ##STR1## wherein R.sup.2 is hydrogen or an aliphatic hydrocarbon which may be substituted with halogen, carboxy or pharmaceutically acceptable esterified carboxy, R.sup.5 is carboxy or pharmaceutically acceptable esterified carboxy, R.sup.6 is amino or protected amino and R.sup.7 is lower alkanesulfonyl or arenesulfonyl and pharmaceutically acceptable salt thereof, processes for making them, pharmaceutical compositions containing them and their use in treating infectious diseases.
本发明特别涉及公式如下的syn化合物:##STR1##
其中,R.sup.2是氢或脂肪烃,可以用卤素、羧基或药用可接受的酯化羧基进行取代,R.sup.5是羧基或药用可接受的酯化羧基,R.sup.6是
氨基或受保护的
氨基,R.sup.7是较低的烷基磺酰基或芳基磺酰基及其药用可接受的盐,制备它们的方法,含有它们的药物组成物以及它们在治疗传染病方面的用途。