1. B-Lactam Antibiotics * The group of antibiotics known as the B-lactams include penicillins, cephalosporins, monobactams and the carbapenems N N C-R CO COH Penicillin nucleus Cephalosporin nucleus HO R N 5C-Q-% 5-R 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