car·ba·pen·em 
(kär′bə-pĕnəm)
(kär′bə-pĕnəm)n.
Any of several semisynthetic or synthetic beta-lactam antibiotics that are used chiefly to treat serious infections caused by bacteria that are resistant to other antibiotics.
[carba-, alteration of CARBON + penem, kind of beta-lactam with a double bond (alteration of penam, similar beta-lactam with a single bond, influenced by -ENE).]