Core structure of the<unk> s.<unk> s are a group of β-lactam antibiotics. They are very similar to cephalosporins, and the<unk> s are sometimes classified as cephalosporins. Like cephalosporins,<unk> s are based upon the cephem nucleus. Unlike most cephalosporins,<unk> s are a very efficient antibiotic against anaerobic microbes.<unk> s were originally produced by Streptomyces, but synthetic ones have been produced as well.<unk> s possess a methoxy group at the 7-alpha position. In addition,<unk> s have been shown to be stable against extended-spectrum beta-lactamase (ESBL) producing organisms, although their use in clinical practice is lacking for this indication.
Cephamycin
Meropenem
Resistin
Spiramycin
Vancomycin
Imipenem
Ampicillin
Ertapenem