The invention relates to antimicrobial compounds of the formula: ##STR1## wherein R.sup.1 is amino or a protected amino, R.sup.2 is ethyl, propyl or lower alkenyl, R.sup.3 is COO .theta., carboxy or a protected carboxy, R.sup.4 is hydroxy(lower)alkyl or protected hydroxy(lower)alkyl, R.sup.5 is amino or a protected amino, X.sup..theta. is an anion, and n is 0 or 1, or, R.sup.1, R.sup.3, R.sup.5, X.sup..theta. and n are each as defined above, R.sup.2 is lower alkyl, and R.sup.4 is 3-hydroxypropyl, with proviso that (i) when R.sup.3 is COO.sup..theta., then n is 0, and (ii) when R.sup.3 is carboxy or a protected carboxy, then n is 1, or a pharmaceutically acceptable salt thereof.
本发明涉及公式为: ##STR1##其中R.sup.1是
氨基或保护
氨基,R.sup.2是乙基,丙基或较低的烯基,R.sup.3是COO.theta.,羧基或保护羧基,R.sup.4是羟基(较低)烷基或保护羟基(较低)烷基,R.sup.5是
氨基或保护
氨基,X.sup..theta.是阴离子,n为0或1,或者,R.sup.1,R.sup.3,R.sup.5,X.sup..theta.和n分别如上所定义,R.sup.2是较低的烷基,R.sup.4是3-羟基丙基,但前提是(i)当R.sup.3是COO.sup..theta.时,n为0,(ii)当R.sup.3是羧基或保护羧基时,n为1,或其药学上可接受的盐。