five isolates produced enzymes with high activity against the penem sch 34343 and the carbapenem imipenem : the enzymes from some of these isolates also had activity against penicillin , ampicillin , carbenicillin , cephaloridine and cephalexin but one isolate produced an enzyme with no detectable activity against cephalosporins .
C0030842
penicillin
C0006976
carbenicillin