the in-vitro activities of two penems ( fce 22101 and sch 34343 ) were compared to those of a carbapenem ( imipenem ) , a monobactam ( aztreonam ) and three cephalosporins ( cefoperazone , ceftazidime , and cefotaxime ) .
C3536856
cephalosporins
C0007552
cefoperazone