申请人:Beecham Group Limited
公开号:US04206120A1
公开(公告)日:1980-06-03
Compounds of the formula (I): ##STR1## wherein R.sub.1 is hydrogen, lower alkyl, hydroxymethyl or phenyl; R.sub.2 is hydrogen, lower alkyl or an optionally salted or esterified carboxyl group; R.sub.3 is hydrogen, chlorine, optionally substituted alkyl or a conjugating group; and R.sub.4 is a conjugating group, CH.sub.2 OH or CH(OH)CH.sub.3 ; are useful for their .beta.-lactamase inhibitory activity and are also useful in symergistic combinations with penicillins or cephalosporins.
式(I)的化合物:##STR1##其中R.sub.1是氢、低碳烷基、羟甲基或苯基;R.sub.2是氢、低碳烷基或一个可选择盐化或酯化的羧基;R.sub.3是氢、氯、可选择取代的烷基或一个共轭基团;R.sub.4是一个共轭基团、CH.sub.2 OH或CH(OH)CH.sub.3;这些化合物对其β-内酰胺酶抑制活性很有用,并且与青霉素或头孢菌素的协同组合也很有用。