three new cephalosporins ( cefuroxime , cefamandole , cefaclor ) and a cephamycin ( cefoxitin ) were bacteriostatic ( minimal inhibitory concentration < /=0.8 mug/ml ) for 90 % of pen s , pen i , and pen r strains .
C3536856
cephalosporins
C0007557
cefoxitin