Core structure of the cephalosporins.Core structure of the cephamycins.
Cephems are a sub-group of β-lactam antibiotics including cephalosporins and cephamycins.[1] It is one of the most common 4-membered ring heterocycle.[2] Produced by actinomycetes, cephamycins were found to display antibacterial activity against a wide range of bacteria, including those resistant to penicillin and cephalosporins.[3] The antimicrobial properties of Cephem include the attachment to certain penicillin-binding proteins that are involved in the production of cell walls of bacteria.[4]
^Hamilton-Miller JM (November 2003). "Chemical and microbiologic aspects of penems, a distinct class of beta-lactams: focus on faropenem". Pharmacotherapy. 23 (11): 1497–1507. doi:10.1592/phco.23.14.1497.31937. PMID14620395. S2CID43705118.
^Vitaku E, Smith DT, Njardarson JT (December 2014). "Analysis of the structural diversity, substitution patterns, and frequency of nitrogen heterocycles among U.S. FDA approved pharmaceuticals". Journal of Medicinal Chemistry. 57 (24): 10257–10274. doi:10.1021/jm501100b. PMID25255204.