1. 
   Carbacephem
   A carbacephem is a type of synthetically made antibiotic, 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 op http://en.wikipedia.org/wiki/Carbacephem
   
   
2. 
   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 op http://www.encyclo.co.uk/local/21001
   
   

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