<unk>  is a β-lactamase-resistant penicillin introduced by Beecham, marketed by Eumedica Pharmaceuticals as Negaban. It is used primarily for the treatment of multiple drug-resistant, Gram-negative bacteria.  It is a carboxypenicillin.
Temocillin
Piperacillin sodium
Azlocillin
Hetacillin
Nafcillin sodium
Sultamicillin
Ticarcillin
Fumagillin