1. B-Lactam Antibiotics The group of antibiotics known as the B-lactams include penicillins, cephalosporins, monobactams and the carbapenems N C-R COH COH Penicillin nucleus Cephalosporin nucleu HO N HC 5-R N SO.H COH Monobactam nucleus Carbapenem nucleus1.*β –Lactam Antibiotics *The group of antibiotics known as the β-lactams include penicillins, cephalosporins, monobactams and the carbapenems