( 6,7r ) -7- [ ( z ) -2- ( 2-amino-4-thiazoyl ) -2-methoxyiminoacetamido ] -8-oxo-5-thia-1 -azabicyclo [ 4,2,0 ] oct-2-ene-2-carboxylate ( ceftizoxime ) , a new parenteral cephalosporin , in more potently active in vitro and in vivo against various gram-negative bacilli including the opportunistic pathogens such as enterobacter , citrobacter species and serratia marcescens than cephalosporins and cephamycins recently developed .
C3536856
cephalosporins
C0007736
cephamycins