cefoxitin-resistant strains ( mic greater than or equal to 16 micrograms/ml ) were also resistant to the new cephalosporins bl-s786 and hr-756 as well as to the new cefamycins a , b , cl619-183 , cs-1170 and sq-14359 and to thienamycin .
C0007557
cefoxitin
C0007736
cefamycins