penicillin g and ampicillin showed in vitro activity against brucella ( mic90 4 micrograms/ml ) , whereas the antipseudomonal penicillins were less active ( carbenicillin mic90 12 micrograms/ml , piperacillin mic90 32 micrograms/ml ) .
C0030827
penicillin g
C0002680
ampicillin