carbacephem

carbacephem
car·ba·ceph·em (kahr″bə-sefґəm) any of a class of β-lactam antibiotics closely related to the cephalosporins, having a methylene group substituted for the sulfur atom in the 7-aminocephalosporanic acid nucleus; carbacephems are chemically more stable than cephalosporins.

Medical dictionary. 2011.

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