Carbacephem

Carbacephems are a class of synthetic antibiotics, based on the structure of cephalosporin, a cephem. Carbacephems are similar to cephems, but with a carbon substituted for the sulfur. It prevents bacterial cell division by inhibiting cell wall synthesis. ...
Found on http://en.wikipedia.org/wiki/Carbacephem

carbacephem

(kahr″bә-sef┬┤әm) any of a class of antibiotics closely related to the cephalosporins in structure, antimicrobial activity, and use, but chemically more stable.
Found on http://www.encyclo.co.uk/local/21001
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