mt-141 , a new cephamycin ( 7 alpha-methoxy-cephalosporin ) antibiotic with a d-cysteine moiety in its 7 beta-side chain , has binding affinities to penicillin-binding proteins of escherichia coli and an inhibitory action on their transpeptidase activity similar to those of other structurally related cephamycins .
C3536856
cephalosporin
C0007736
cephamycins