cefoxitin , 3-carbamoyloxymethyl-7-alpha-methoxy-7- [ 2- ( 2-thienyl ) acetamido ] -3-cephem-4- carboxylic acid , a semisynthetic cephamycin antibiotic shown to have broad-spectrum activity in vitro , is active also in vivo against a wide variety of bacteria including penicillin-resistant staphylococci .
C0007557
cefoxitin
C0007736
cephamycin