carbenicillin , ticarcillin , mezlocillin , piperacillin ( and ampicillin for c. freundii ) were active against both inducible and basal organisms ( mic less than 16 mg/l ) , but inactive against the derepressed mutants ( mics usually greater than 64 mg/l ) .
C0025893
mezlocillin
C0002680
ampicillin